diff --git a/IntegrationTests/AccessibilityManagerTest.js b/IntegrationTests/AccessibilityManagerTest.js
index dd155cec22c..48942004acb 100644
--- a/IntegrationTests/AccessibilityManagerTest.js
+++ b/IntegrationTests/AccessibilityManagerTest.js
@@ -39,7 +39,7 @@ class AccessibilityManagerTest extends React.Component<{...}> {
       accessibilityExtraExtraLarge: 11.0,
       accessibilityExtraExtraExtraLarge: 12.0,
     });
-    RCTDeviceEventEmitter.addListener('didUpdateDimensions', update => {
+    RCTDeviceEventEmitter.addListener('didUpdateDimensions', (update) => {
       TestModule.markTestPassed(update.window.fontScale === 4.0);
     });
   }
diff --git a/IntegrationTests/AsyncStorageTest.js b/IntegrationTests/AsyncStorageTest.js
index e33cedfdd82..e5a1badfd5e 100644
--- a/IntegrationTests/AsyncStorageTest.js
+++ b/IntegrationTests/AsyncStorageTest.js
@@ -66,7 +66,7 @@ function expectAsyncNoError(place, err) {
 }
 
 function testSetAndGet() {
-  AsyncStorage.setItem(KEY_1, VAL_1, err1 => {
+  AsyncStorage.setItem(KEY_1, VAL_1, (err1) => {
     expectAsyncNoError('testSetAndGet/setItem', err1);
     AsyncStorage.getItem(KEY_1, (err2, result) => {
       expectAsyncNoError('testSetAndGet/getItem', err2);
@@ -109,7 +109,7 @@ function testRemoveItem() {
           'Missing KEY_1 or KEY_2 in ' + '(' + result + ')',
         );
         updateMessage('testRemoveItem - add two items');
-        AsyncStorage.removeItem(KEY_1, err2 => {
+        AsyncStorage.removeItem(KEY_1, (err2) => {
           expectAsyncNoError('testRemoveItem/removeItem', err2);
           updateMessage('delete successful ');
           AsyncStorage.getItem(KEY_1, (err3, result2) => {
@@ -137,9 +137,9 @@ function testRemoveItem() {
 }
 
 function testMerge() {
-  AsyncStorage.setItem(KEY_MERGE, JSON.stringify(VAL_MERGE_1), err1 => {
+  AsyncStorage.setItem(KEY_MERGE, JSON.stringify(VAL_MERGE_1), (err1) => {
     expectAsyncNoError('testMerge/setItem', err1);
-    AsyncStorage.mergeItem(KEY_MERGE, JSON.stringify(VAL_MERGE_2), err2 => {
+    AsyncStorage.mergeItem(KEY_MERGE, JSON.stringify(VAL_MERGE_2), (err2) => {
       expectAsyncNoError('testMerge/mergeItem', err2);
       AsyncStorage.getItem(KEY_MERGE, (err3, result) => {
         expectAsyncNoError('testMerge/setItem', err3);
@@ -152,11 +152,14 @@ function testMerge() {
 }
 
 function testOptimizedMultiGet() {
-  let batch = [[KEY_1, VAL_1], [KEY_2, VAL_2]];
+  let batch = [
+    [KEY_1, VAL_1],
+    [KEY_2, VAL_2],
+  ];
   let keys = batch.map(([key, value]) => key);
-  AsyncStorage.multiSet(batch, err1 => {
+  AsyncStorage.multiSet(batch, (err1) => {
     // yes, twice on purpose
-    [1, 2].forEach(i => {
+    [1, 2].forEach((i) => {
       expectAsyncNoError(`${i} testOptimizedMultiGet/multiSet`, err1);
       AsyncStorage.multiGet(keys, (err2, result) => {
         expectAsyncNoError(`${i} testOptimizedMultiGet/multiGet`, err2);
@@ -182,7 +185,7 @@ class AsyncStorageTest extends React.Component<{...}, $FlowFixMeState> {
       this.setState({done: true}, () => {
         TestModule.markTestCompleted();
       });
-    updateMessage = msg => {
+    updateMessage = (msg) => {
       this.setState({messages: this.state.messages.concat('\n' + msg)});
       DEBUG && console.log(msg);
     };
diff --git a/IntegrationTests/ImageCachePolicyTest.js b/IntegrationTests/ImageCachePolicyTest.js
index 03857091072..600634b88ba 100644
--- a/IntegrationTests/ImageCachePolicyTest.js
+++ b/IntegrationTests/ImageCachePolicyTest.js
@@ -40,7 +40,7 @@ class ImageCachePolicyTest extends React.Component<Props, $FlowFixMeState> {
   state: $FlowFixMe | {...} = {};
 
   shouldComponentUpdate(nextProps: Props, nextState: State): boolean {
-    const results: Array<?boolean> = TESTS.map(x => nextState[x]);
+    const results: Array<?boolean> = TESTS.map((x) => nextState[x]);
 
     if (!results.includes(undefined)) {
       const result: boolean = results.reduce(
diff --git a/IntegrationTests/IntegrationTestsApp.js b/IntegrationTests/IntegrationTestsApp.js
index 1e52877b7b9..5894a1bf439 100644
--- a/IntegrationTests/IntegrationTestsApp.js
+++ b/IntegrationTests/IntegrationTestsApp.js
@@ -43,7 +43,7 @@ TESTS.forEach(
   /* $FlowFixMe(>=0.54.0 site=react_native_fb,react_native_oss) This comment
    * suppresses an error found when Flow v0.54 was deployed. To see the error
    * delete this comment and run Flow. */
-  test => AppRegistry.registerComponent(test.displayName, () => test),
+  (test) => AppRegistry.registerComponent(test.displayName, () => test),
 );
 
 // Modules required for integration tests
@@ -76,7 +76,7 @@ class IntegrationTestsApp extends React.Component<{...}, $FlowFixMeState> {
         </Text>
         <View style={styles.separator} />
         <ScrollView>
-          {TESTS.map(test => [
+          {TESTS.map((test) => [
             <TouchableOpacity
               onPress={() => this.setState({test})}
               /* $FlowFixMe(>=0.115.0 site=react_native_fb) This comment
diff --git a/IntegrationTests/LayoutEventsTest.js b/IntegrationTests/LayoutEventsTest.js
index c86592a600b..d144d0f9ce9 100644
--- a/IntegrationTests/LayoutEventsTest.js
+++ b/IntegrationTests/LayoutEventsTest.js
@@ -141,13 +141,13 @@ class LayoutEventsTest extends React.Component<Props, State> {
     return (
       <View style={[styles.container, this.state.containerStyle]}>
         <View
-          ref={ref => {
+          ref={(ref) => {
             this._view = ref;
           }}
           onLayout={this.onViewLayout}
           style={viewStyle}>
           <Image
-            ref={ref => {
+            ref={(ref) => {
               this._img = ref;
             }}
             onLayout={this.onImageLayout}
@@ -155,7 +155,7 @@ class LayoutEventsTest extends React.Component<Props, State> {
             source={{uri: 'uie_thumb_big.png'}}
           />
           <Text
-            ref={ref => {
+            ref={(ref) => {
               this._txt = ref;
             }}
             onLayout={this.onTextLayout}
diff --git a/IntegrationTests/LoggingTestModule.js b/IntegrationTests/LoggingTestModule.js
index 6eab2d7337f..e69457d8250 100644
--- a/IntegrationTests/LoggingTestModule.js
+++ b/IntegrationTests/LoggingTestModule.js
@@ -15,24 +15,24 @@ const warning = require('fbjs/lib/warning');
 const invariant = require('invariant');
 
 const LoggingTestModule = {
-  logToConsole: function(str) {
+  logToConsole: function (str) {
     console.log(str);
   },
-  logToConsoleAfterWait: function(str, timeout_ms) {
-    setTimeout(function() {
+  logToConsoleAfterWait: function (str, timeout_ms) {
+    setTimeout(function () {
       console.log(str);
     }, timeout_ms);
   },
-  warning: function(str) {
+  warning: function (str) {
     warning(false, str);
   },
-  invariant: function(str) {
+  invariant: function (str) {
     invariant(false, str);
   },
-  logErrorToConsole: function(str) {
+  logErrorToConsole: function (str) {
     console.error(str);
   },
-  throwError: function(str) {
+  throwError: function (str) {
     throw new Error(str);
   },
 };
diff --git a/IntegrationTests/RCTRootViewIntegrationTestApp.js b/IntegrationTests/RCTRootViewIntegrationTestApp.js
index 2466b637858..89aeadbc3e9 100644
--- a/IntegrationTests/RCTRootViewIntegrationTestApp.js
+++ b/IntegrationTests/RCTRootViewIntegrationTestApp.js
@@ -28,7 +28,7 @@ const TESTS = [
   require('./SizeFlexibilityUpdateTest'),
 ];
 
-TESTS.forEach(test =>
+TESTS.forEach((test) =>
   AppRegistry.registerComponent(test.displayName, () => test),
 );
 
@@ -54,7 +54,7 @@ class RCTRootViewIntegrationTestApp extends React.Component {
         </Text>
         <View style={styles.separator} />
         <ScrollView>
-          {TESTS.map(test => [
+          {TESTS.map((test) => [
             <TouchableOpacity
               onPress={() => this.setState({test})}
               style={styles.row}>
diff --git a/IntegrationTests/SyncMethodTest.js b/IntegrationTests/SyncMethodTest.js
index 077884256d2..3b8105c66d0 100644
--- a/IntegrationTests/SyncMethodTest.js
+++ b/IntegrationTests/SyncMethodTest.js
@@ -27,7 +27,7 @@ class SyncMethodTest extends React.Component<{...}> {
       throw new Error('Something wrong with methodThatReturnsNil sync method');
     }
     let response;
-    RNTesterTestModule.methodThatCallsCallbackWithString('test', echo => {
+    RNTesterTestModule.methodThatCallsCallbackWithString('test', (echo) => {
       response = echo;
     });
     requestAnimationFrame(() => {
diff --git a/IntegrationTests/TimersTest.js b/IntegrationTests/TimersTest.js
index 8550c6f00ee..8528718e154 100644
--- a/IntegrationTests/TimersTest.js
+++ b/IntegrationTests/TimersTest.js
@@ -153,7 +153,7 @@ class TimersTest extends React.Component<Props, State> {
     fails.push(this.setTimeout(() => this._fail('testClearMulti-4'), 0));
     fails.push(this.setTimeout(() => this._fail('testClearMulti-5'), 10));
 
-    fails.forEach(timeout => this.clearTimeout(timeout));
+    fails.forEach((timeout) => this.clearTimeout(timeout));
     this.setTimeout(() => this.clearTimeout(delayClear), 20);
 
     this.setTimeout(this.testOrdering, 50);
diff --git a/IntegrationTests/WebSocketTest.js b/IntegrationTests/WebSocketTest.js
index 3435feabb11..dd6c7d0021e 100644
--- a/IntegrationTests/WebSocketTest.js
+++ b/IntegrationTests/WebSocketTest.js
@@ -45,7 +45,7 @@ class WebSocketTest extends React.Component<{...}, State> {
 
   _waitFor = (condition: any, timeout: any, callback: any) => {
     let remaining = timeout;
-    const timeoutFunction = function() {
+    const timeoutFunction = function () {
       if (condition()) {
         callback(true);
         return;
@@ -62,7 +62,7 @@ class WebSocketTest extends React.Component<{...}, State> {
 
   _connect = () => {
     const socket = new WebSocket(this.state.url);
-    WS_EVENTS.forEach(ev => socket.addEventListener(ev, this._onSocketEvent));
+    WS_EVENTS.forEach((ev) => socket.addEventListener(ev, this._onSocketEvent));
     this.setState({
       socket,
       socketState: socket.readyState,
@@ -116,7 +116,7 @@ class WebSocketTest extends React.Component<{...}, State> {
 
   testConnect: () => void = () => {
     this._connect();
-    this._waitFor(this._socketIsConnected, 5, connectSucceeded => {
+    this._waitFor(this._socketIsConnected, 5, (connectSucceeded) => {
       if (!connectSucceeded) {
         TestModule.markTestPassed(false);
         return;
@@ -127,7 +127,7 @@ class WebSocketTest extends React.Component<{...}, State> {
 
   testSendAndReceive: () => void = () => {
     this._sendTestMessage();
-    this._waitFor(this._receivedTestExpectedResponse, 5, messageReceived => {
+    this._waitFor(this._receivedTestExpectedResponse, 5, (messageReceived) => {
       if (!messageReceived) {
         TestModule.markTestPassed(false);
         return;
@@ -138,7 +138,7 @@ class WebSocketTest extends React.Component<{...}, State> {
 
   testDisconnect: () => void = () => {
     this._disconnect();
-    this._waitFor(this._socketIsDisconnected, 5, disconnectSucceeded => {
+    this._waitFor(this._socketIsDisconnected, 5, (disconnectSucceeded) => {
       TestModule.markTestPassed(disconnectSucceeded);
     });
   };
diff --git a/Libraries/Alert/Alert.js b/Libraries/Alert/Alert.js
index e6aead18643..bd739d52d6a 100644
--- a/Libraries/Alert/Alert.js
+++ b/Libraries/Alert/Alert.js
@@ -97,7 +97,7 @@ class Alert {
           options && options.onDismiss && options.onDismiss();
         }
       };
-      const onError = errorMessage => console.warn(errorMessage);
+      const onError = (errorMessage) => console.warn(errorMessage);
       NativeDialogManagerAndroid.showAlert(config, onError, onAction);
     }
   }
diff --git a/Libraries/Alert/RCTAlertManager.android.js b/Libraries/Alert/RCTAlertManager.android.js
index 43f49a94e50..b3654ba093e 100644
--- a/Libraries/Alert/RCTAlertManager.android.js
+++ b/Libraries/Alert/RCTAlertManager.android.js
@@ -14,7 +14,7 @@ import NativeDialogManagerAndroid from '../NativeModules/specs/NativeDialogManag
 function emptyCallback() {}
 
 module.exports = {
-  alertWithArgs: function(args, callback) {
+  alertWithArgs: function (args, callback) {
     // TODO(5998984): Polyfill it correctly with DialogManagerAndroid
     if (!NativeDialogManagerAndroid) {
       return;
diff --git a/Libraries/Animated/release/gulpfile.js b/Libraries/Animated/release/gulpfile.js
index 291f3236303..e84102976dd 100644
--- a/Libraries/Animated/release/gulpfile.js
+++ b/Libraries/Animated/release/gulpfile.js
@@ -46,7 +46,7 @@ var babelOpts = {
   }),
 };
 
-var buildDist = function(opts) {
+var buildDist = function (opts) {
   var webpackOpts = {
     debug: opts.debug,
     externals: {
@@ -80,7 +80,7 @@ var buildDist = function(opts) {
       }),
     );
   }
-  return webpackStream(webpackOpts, null, function(err, stats) {
+  return webpackStream(webpackOpts, null, function (err, stats) {
     if (err) {
       throw new gulpUtil.PluginError('webpack', err);
     }
@@ -101,11 +101,11 @@ var paths = {
   ],
 };
 
-gulp.task('clean', function(cb) {
+gulp.task('clean', function (cb) {
   del([paths.dist, paths.lib], cb);
 });
 
-gulp.task('modules', function() {
+gulp.task('modules', function () {
   return gulp
     .src(paths.src, {cwd: '../'})
     .pipe(babel(babelOpts))
@@ -113,7 +113,7 @@ gulp.task('modules', function() {
     .pipe(gulp.dest(paths.lib));
 });
 
-gulp.task('dist', ['modules'], function() {
+gulp.task('dist', ['modules'], function () {
   var distOpts = {
     debug: true,
     output: 'animated.js',
@@ -130,7 +130,7 @@ gulp.task('dist', ['modules'], function() {
     .pipe(gulp.dest(paths.dist));
 });
 
-gulp.task('dist:min', ['modules'], function() {
+gulp.task('dist:min', ['modules'], function () {
   var distOpts = {
     debug: false,
     output: 'animated.min.js',
@@ -146,10 +146,10 @@ gulp.task('dist:min', ['modules'], function() {
     .pipe(gulp.dest(paths.dist));
 });
 
-gulp.task('watch', function() {
+gulp.task('watch', function () {
   gulp.watch(paths.src, ['modules']);
 });
 
-gulp.task('default', function(cb) {
+gulp.task('default', function (cb) {
   runSequence('clean', 'modules', ['dist', 'dist:min'], cb);
 });
diff --git a/Libraries/Animated/src/AnimatedEvent.js b/Libraries/Animated/src/AnimatedEvent.js
index 91eb29ce413..61fbefc91f5 100644
--- a/Libraries/Animated/src/AnimatedEvent.js
+++ b/Libraries/Animated/src/AnimatedEvent.js
@@ -58,7 +58,7 @@ function attachNativeEvent(
 
   const viewTag = ReactNative.findNodeHandle(viewRef);
   if (viewTag != null) {
-    eventMappings.forEach(mapping => {
+    eventMappings.forEach((mapping) => {
       NativeAnimatedHelper.API.addAnimatedEventToView(
         viewTag,
         eventName,
@@ -70,7 +70,7 @@ function attachNativeEvent(
   return {
     detach() {
       if (viewTag != null) {
-        eventMappings.forEach(mapping => {
+        eventMappings.forEach((mapping) => {
           NativeAnimatedHelper.API.removeAnimatedEventFromView(
             viewTag,
             eventName,
@@ -155,7 +155,9 @@ class AnimatedEvent {
   }
 
   __removeListener(callback: Function): void {
-    this._listeners = this._listeners.filter(listener => listener !== callback);
+    this._listeners = this._listeners.filter(
+      (listener) => listener !== callback,
+    );
   }
 
   __attach(viewRef: any, eventName: string) {
@@ -226,7 +228,7 @@ class AnimatedEvent {
   }
 
   _callListeners(...args: any) {
-    this._listeners.forEach(listener => listener(...args));
+    this._listeners.forEach((listener) => listener(...args));
   }
 }
 
diff --git a/Libraries/Animated/src/AnimatedImplementation.js b/Libraries/Animated/src/AnimatedImplementation.js
index 5045ed398ff..4fdd8c5394d 100644
--- a/Libraries/Animated/src/AnimatedImplementation.js
+++ b/Libraries/Animated/src/AnimatedImplementation.js
@@ -49,39 +49,39 @@ export type CompositeAnimation = {
   ...
 };
 
-const add = function(
+const add = function (
   a: AnimatedNode | number,
   b: AnimatedNode | number,
 ): AnimatedAddition {
   return new AnimatedAddition(a, b);
 };
 
-const subtract = function(
+const subtract = function (
   a: AnimatedNode | number,
   b: AnimatedNode | number,
 ): AnimatedSubtraction {
   return new AnimatedSubtraction(a, b);
 };
 
-const divide = function(
+const divide = function (
   a: AnimatedNode | number,
   b: AnimatedNode | number,
 ): AnimatedDivision {
   return new AnimatedDivision(a, b);
 };
 
-const multiply = function(
+const multiply = function (
   a: AnimatedNode | number,
   b: AnimatedNode | number,
 ): AnimatedMultiplication {
   return new AnimatedMultiplication(a, b);
 };
 
-const modulo = function(a: AnimatedNode, modulus: number): AnimatedModulo {
+const modulo = function (a: AnimatedNode, modulus: number): AnimatedModulo {
   return new AnimatedModulo(a, modulus);
 };
 
-const diffClamp = function(
+const diffClamp = function (
   a: AnimatedNode,
   min: number,
   max: number,
@@ -89,7 +89,7 @@ const diffClamp = function(
   return new AnimatedDiffClamp(a, min, max);
 };
 
-const _combineCallbacks = function(
+const _combineCallbacks = function (
   callback: ?EndCallback,
   config: {...AnimationConfig, ...},
 ) {
@@ -103,7 +103,7 @@ const _combineCallbacks = function(
   }
 };
 
-const maybeVectorAnim = function(
+const maybeVectorAnim = function (
   value: AnimatedValue | AnimatedValueXY,
   config: Object,
   anim: (value: AnimatedValue, config: Object) => CompositeAnimation,
@@ -127,11 +127,11 @@ const maybeVectorAnim = function(
   return null;
 };
 
-const spring = function(
+const spring = function (
   value: AnimatedValue | AnimatedValueXY,
   config: SpringAnimationConfig,
 ): CompositeAnimation {
-  const start = function(
+  const start = function (
     animatedValue: AnimatedValue | AnimatedValueXY,
     configuration: SpringAnimationConfig,
     callback?: ?EndCallback,
@@ -156,35 +156,35 @@ const spring = function(
   };
   return (
     maybeVectorAnim(value, config, spring) || {
-      start: function(callback?: ?EndCallback): void {
+      start: function (callback?: ?EndCallback): void {
         start(value, config, callback);
       },
 
-      stop: function(): void {
+      stop: function (): void {
         value.stopAnimation();
       },
 
-      reset: function(): void {
+      reset: function (): void {
         value.resetAnimation();
       },
 
-      _startNativeLoop: function(iterations?: number): void {
+      _startNativeLoop: function (iterations?: number): void {
         const singleConfig = {...config, iterations};
         start(value, singleConfig);
       },
 
-      _isUsingNativeDriver: function(): boolean {
+      _isUsingNativeDriver: function (): boolean {
         return config.useNativeDriver || false;
       },
     }
   );
 };
 
-const timing = function(
+const timing = function (
   value: AnimatedValue | AnimatedValueXY,
   config: TimingAnimationConfig,
 ): CompositeAnimation {
-  const start = function(
+  const start = function (
     animatedValue: AnimatedValue | AnimatedValueXY,
     configuration: TimingAnimationConfig,
     callback?: ?EndCallback,
@@ -210,35 +210,35 @@ const timing = function(
 
   return (
     maybeVectorAnim(value, config, timing) || {
-      start: function(callback?: ?EndCallback): void {
+      start: function (callback?: ?EndCallback): void {
         start(value, config, callback);
       },
 
-      stop: function(): void {
+      stop: function (): void {
         value.stopAnimation();
       },
 
-      reset: function(): void {
+      reset: function (): void {
         value.resetAnimation();
       },
 
-      _startNativeLoop: function(iterations?: number): void {
+      _startNativeLoop: function (iterations?: number): void {
         const singleConfig = {...config, iterations};
         start(value, singleConfig);
       },
 
-      _isUsingNativeDriver: function(): boolean {
+      _isUsingNativeDriver: function (): boolean {
         return config.useNativeDriver || false;
       },
     }
   );
 };
 
-const decay = function(
+const decay = function (
   value: AnimatedValue | AnimatedValueXY,
   config: DecayAnimationConfig,
 ): CompositeAnimation {
-  const start = function(
+  const start = function (
     animatedValue: AnimatedValue | AnimatedValueXY,
     configuration: DecayAnimationConfig,
     callback?: ?EndCallback,
@@ -252,37 +252,37 @@ const decay = function(
 
   return (
     maybeVectorAnim(value, config, decay) || {
-      start: function(callback?: ?EndCallback): void {
+      start: function (callback?: ?EndCallback): void {
         start(value, config, callback);
       },
 
-      stop: function(): void {
+      stop: function (): void {
         value.stopAnimation();
       },
 
-      reset: function(): void {
+      reset: function (): void {
         value.resetAnimation();
       },
 
-      _startNativeLoop: function(iterations?: number): void {
+      _startNativeLoop: function (iterations?: number): void {
         const singleConfig = {...config, iterations};
         start(value, singleConfig);
       },
 
-      _isUsingNativeDriver: function(): boolean {
+      _isUsingNativeDriver: function (): boolean {
         return config.useNativeDriver || false;
       },
     }
   );
 };
 
-const sequence = function(
+const sequence = function (
   animations: Array<CompositeAnimation>,
 ): CompositeAnimation {
   let current = 0;
   return {
-    start: function(callback?: ?EndCallback) {
-      const onComplete = function(result) {
+    start: function (callback?: ?EndCallback) {
+      const onComplete = function (result) {
         if (!result.finished) {
           callback && callback(result);
           return;
@@ -305,13 +305,13 @@ const sequence = function(
       }
     },
 
-    stop: function() {
+    stop: function () {
       if (current < animations.length) {
         animations[current].stop();
       }
     },
 
-    reset: function() {
+    reset: function () {
       animations.forEach((animation, idx) => {
         if (idx <= current) {
           animation.reset();
@@ -320,13 +320,13 @@ const sequence = function(
       current = 0;
     },
 
-    _startNativeLoop: function() {
+    _startNativeLoop: function () {
       throw new Error(
         'Loops run using the native driver cannot contain Animated.sequence animations',
       );
     },
 
-    _isUsingNativeDriver: function(): boolean {
+    _isUsingNativeDriver: function (): boolean {
       return false;
     },
   };
@@ -337,7 +337,7 @@ type ParallelConfig = {
   stopTogether?: boolean,
   ...
 };
-const parallel = function(
+const parallel = function (
   animations: Array<CompositeAnimation>,
   config?: ?ParallelConfig,
 ): CompositeAnimation {
@@ -347,14 +347,14 @@ const parallel = function(
   const stopTogether = !(config && config.stopTogether === false);
 
   const result = {
-    start: function(callback?: ?EndCallback) {
+    start: function (callback?: ?EndCallback) {
       if (doneCount === animations.length) {
         callback && callback({finished: true});
         return;
       }
 
       animations.forEach((animation, idx) => {
-        const cb = function(endResult) {
+        const cb = function (endResult) {
           hasEnded[idx] = true;
           doneCount++;
           if (doneCount === animations.length) {
@@ -376,14 +376,14 @@ const parallel = function(
       });
     },
 
-    stop: function(): void {
+    stop: function (): void {
       animations.forEach((animation, idx) => {
         !hasEnded[idx] && animation.stop();
         hasEnded[idx] = true;
       });
     },
 
-    reset: function(): void {
+    reset: function (): void {
       animations.forEach((animation, idx) => {
         animation.reset();
         hasEnded[idx] = false;
@@ -391,13 +391,13 @@ const parallel = function(
       });
     },
 
-    _startNativeLoop: function() {
+    _startNativeLoop: function () {
       throw new Error(
         'Loops run using the native driver cannot contain Animated.parallel animations',
       );
     },
 
-    _isUsingNativeDriver: function(): boolean {
+    _isUsingNativeDriver: function (): boolean {
       return false;
     },
   };
@@ -405,7 +405,7 @@ const parallel = function(
   return result;
 };
 
-const delay = function(time: number): CompositeAnimation {
+const delay = function (time: number): CompositeAnimation {
   // Would be nice to make a specialized implementation
   return timing(new AnimatedValue(0), {
     toValue: 0,
@@ -415,7 +415,7 @@ const delay = function(time: number): CompositeAnimation {
   });
 };
 
-const stagger = function(
+const stagger = function (
   time: number,
   animations: Array<CompositeAnimation>,
 ): CompositeAnimation {
@@ -432,15 +432,15 @@ type LoopAnimationConfig = {
   ...
 };
 
-const loop = function(
+const loop = function (
   animation: CompositeAnimation,
   {iterations = -1, resetBeforeIteration = true}: LoopAnimationConfig = {},
 ): CompositeAnimation {
   let isFinished = false;
   let iterationsSoFar = 0;
   return {
-    start: function(callback?: ?EndCallback) {
-      const restart = function(result: EndResult = {finished: true}): void {
+    start: function (callback?: ?EndCallback) {
+      const restart = function (result: EndResult = {finished: true}): void {
         if (
           isFinished ||
           iterationsSoFar === iterations ||
@@ -464,24 +464,24 @@ const loop = function(
       }
     },
 
-    stop: function(): void {
+    stop: function (): void {
       isFinished = true;
       animation.stop();
     },
 
-    reset: function(): void {
+    reset: function (): void {
       iterationsSoFar = 0;
       isFinished = false;
       animation.reset();
     },
 
-    _startNativeLoop: function() {
+    _startNativeLoop: function () {
       throw new Error(
         'Loops run using the native driver cannot contain Animated.loop animations',
       );
     },
 
-    _isUsingNativeDriver: function(): boolean {
+    _isUsingNativeDriver: function (): boolean {
       return animation._isUsingNativeDriver();
     },
   };
@@ -513,7 +513,7 @@ function unforkEvent(
   }
 }
 
-const event = function(
+const event = function (
   argMapping: $ReadOnlyArray<?Mapping>,
   config: EventConfig,
 ): any {
diff --git a/Libraries/Animated/src/AnimatedMock.js b/Libraries/Animated/src/AnimatedMock.js
index eecfbb884ec..1e16110b7d0 100644
--- a/Libraries/Animated/src/AnimatedMock.js
+++ b/Libraries/Animated/src/AnimatedMock.js
@@ -50,7 +50,7 @@ const emptyAnimation = {
   },
 };
 
-const spring = function(
+const spring = function (
   value: AnimatedValue | AnimatedValueXY,
   config: SpringAnimationConfig,
 ): CompositeAnimation {
@@ -64,7 +64,7 @@ const spring = function(
   };
 };
 
-const timing = function(
+const timing = function (
   value: AnimatedValue | AnimatedValueXY,
   config: TimingAnimationConfig,
 ): CompositeAnimation {
@@ -78,32 +78,32 @@ const timing = function(
   };
 };
 
-const decay = function(
+const decay = function (
   value: AnimatedValue | AnimatedValueXY,
   config: DecayAnimationConfig,
 ): CompositeAnimation {
   return emptyAnimation;
 };
 
-const sequence = function(
+const sequence = function (
   animations: Array<CompositeAnimation>,
 ): CompositeAnimation {
   return emptyAnimation;
 };
 
 type ParallelConfig = {stopTogether?: boolean, ...};
-const parallel = function(
+const parallel = function (
   animations: Array<CompositeAnimation>,
   config?: ?ParallelConfig,
 ): CompositeAnimation {
   return emptyAnimation;
 };
 
-const delay = function(time: number): CompositeAnimation {
+const delay = function (time: number): CompositeAnimation {
   return emptyAnimation;
 };
 
-const stagger = function(
+const stagger = function (
   time: number,
   animations: Array<CompositeAnimation>,
 ): CompositeAnimation {
@@ -116,14 +116,14 @@ type LoopAnimationConfig = {
   ...
 };
 
-const loop = function(
+const loop = function (
   animation: CompositeAnimation,
   {iterations = -1}: LoopAnimationConfig = {},
 ): CompositeAnimation {
   return emptyAnimation;
 };
 
-const event = function(argMapping: Array<?Mapping>, config: EventConfig): any {
+const event = function (argMapping: Array<?Mapping>, config: EventConfig): any {
   return null;
 };
 
diff --git a/Libraries/Animated/src/Easing.js b/Libraries/Animated/src/Easing.js
index 253a3e785aa..3503d1e59dc 100644
--- a/Libraries/Animated/src/Easing.js
+++ b/Libraries/Animated/src/Easing.js
@@ -164,7 +164,8 @@ class Easing {
    */
   static elastic(bounciness: number = 1): (t: number) => number {
     const p = bounciness * Math.PI;
-    return t => 1 - Math.pow(Math.cos((t * Math.PI) / 2), 3) * Math.cos(t * p);
+    return (t) =>
+      1 - Math.pow(Math.cos((t * Math.PI) / 2), 3) * Math.cos(t * p);
   }
 
   /**
@@ -176,7 +177,7 @@ class Easing {
    * - http://tiny.cc/back_default (s = 1.70158, default)
    */
   static back(s: number = 1.70158): (t: number) => number {
-    return t => t * t * ((s + 1) * t - s);
+    return (t) => t * t * ((s + 1) * t - s);
   }
 
   /**
@@ -231,7 +232,7 @@ class Easing {
    * Runs an easing function backwards.
    */
   static out(easing: (t: number) => number): (t: number) => number {
-    return t => 1 - easing(1 - t);
+    return (t) => 1 - easing(1 - t);
   }
 
   /**
@@ -240,7 +241,7 @@ class Easing {
    * duration.
    */
   static inOut(easing: (t: number) => number): (t: number) => number {
-    return t => {
+    return (t) => {
       if (t < 0.5) {
         return easing(t * 2) / 2;
       }
diff --git a/Libraries/Animated/src/NativeAnimatedHelper.js b/Libraries/Animated/src/NativeAnimatedHelper.js
index f21066bb07f..6b50f968af2 100644
--- a/Libraries/Animated/src/NativeAnimatedHelper.js
+++ b/Libraries/Animated/src/NativeAnimatedHelper.js
@@ -35,10 +35,10 @@ let queue = [];
  * the native module methods
  */
 const API = {
-  enableQueue: function(): void {
+  enableQueue: function (): void {
     queueConnections = true;
   },
-  disableQueue: function(): void {
+  disableQueue: function (): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     queueConnections = false;
     for (let q = 0, l = queue.length; q < l; q++) {
@@ -47,19 +47,19 @@ const API = {
     }
     queue.length = 0;
   },
-  createAnimatedNode: function(tag: number, config: AnimatedNodeConfig): void {
+  createAnimatedNode: function (tag: number, config: AnimatedNodeConfig): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.createAnimatedNode(tag, config);
   },
-  startListeningToAnimatedNodeValue: function(tag: number) {
+  startListeningToAnimatedNodeValue: function (tag: number) {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.startListeningToAnimatedNodeValue(tag);
   },
-  stopListeningToAnimatedNodeValue: function(tag: number) {
+  stopListeningToAnimatedNodeValue: function (tag: number) {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.stopListeningToAnimatedNodeValue(tag);
   },
-  connectAnimatedNodes: function(parentTag: number, childTag: number): void {
+  connectAnimatedNodes: function (parentTag: number, childTag: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     if (queueConnections) {
       queue.push([parentTag, childTag]);
@@ -67,11 +67,14 @@ const API = {
     }
     NativeAnimatedModule.connectAnimatedNodes(parentTag, childTag);
   },
-  disconnectAnimatedNodes: function(parentTag: number, childTag: number): void {
+  disconnectAnimatedNodes: function (
+    parentTag: number,
+    childTag: number,
+  ): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.disconnectAnimatedNodes(parentTag, childTag);
   },
-  startAnimatingNode: function(
+  startAnimatingNode: function (
     animationId: number,
     nodeTag: number,
     config: AnimatingNodeConfig,
@@ -85,49 +88,49 @@ const API = {
       endCallback,
     );
   },
-  stopAnimation: function(animationId: number) {
+  stopAnimation: function (animationId: number) {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.stopAnimation(animationId);
   },
-  setAnimatedNodeValue: function(nodeTag: number, value: number): void {
+  setAnimatedNodeValue: function (nodeTag: number, value: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.setAnimatedNodeValue(nodeTag, value);
   },
-  setAnimatedNodeOffset: function(nodeTag: number, offset: number): void {
+  setAnimatedNodeOffset: function (nodeTag: number, offset: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.setAnimatedNodeOffset(nodeTag, offset);
   },
-  flattenAnimatedNodeOffset: function(nodeTag: number): void {
+  flattenAnimatedNodeOffset: function (nodeTag: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.flattenAnimatedNodeOffset(nodeTag);
   },
-  extractAnimatedNodeOffset: function(nodeTag: number): void {
+  extractAnimatedNodeOffset: function (nodeTag: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.extractAnimatedNodeOffset(nodeTag);
   },
-  connectAnimatedNodeToView: function(nodeTag: number, viewTag: number): void {
+  connectAnimatedNodeToView: function (nodeTag: number, viewTag: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.connectAnimatedNodeToView(nodeTag, viewTag);
   },
-  disconnectAnimatedNodeFromView: function(
+  disconnectAnimatedNodeFromView: function (
     nodeTag: number,
     viewTag: number,
   ): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.disconnectAnimatedNodeFromView(nodeTag, viewTag);
   },
-  restoreDefaultValues: function(nodeTag: number): void {
+  restoreDefaultValues: function (nodeTag: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     // Backwards compat with older native runtimes, can be removed later.
     if (NativeAnimatedModule.restoreDefaultValues != null) {
       NativeAnimatedModule.restoreDefaultValues(nodeTag);
     }
   },
-  dropAnimatedNode: function(tag: number): void {
+  dropAnimatedNode: function (tag: number): void {
     invariant(NativeAnimatedModule, 'Native animated module is not available');
     NativeAnimatedModule.dropAnimatedNode(tag);
   },
-  addAnimatedEventToView: function(
+  addAnimatedEventToView: function (
     viewTag: number,
     eventName: string,
     eventMapping: EventMapping,
@@ -232,12 +235,10 @@ function validateTransform(
       },
   >,
 ): void {
-  configs.forEach(config => {
+  configs.forEach((config) => {
     if (!TRANSFORM_WHITELIST.hasOwnProperty(config.property)) {
       throw new Error(
-        `Property '${
-          config.property
-        }' is not supported by native animated module`,
+        `Property '${config.property}' is not supported by native animated module`,
       );
     }
   });
diff --git a/Libraries/Animated/src/__tests__/AnimatedMock-test.js b/Libraries/Animated/src/__tests__/AnimatedMock-test.js
index 8ba4e998b36..a7e325748f1 100644
--- a/Libraries/Animated/src/__tests__/AnimatedMock-test.js
+++ b/Libraries/Animated/src/__tests__/AnimatedMock-test.js
@@ -19,8 +19,8 @@ describe('Animated Mock', () => {
       Object.keys(AnimatedImplementation),
     );
   });
-  it('matches implementation params', done => {
-    Object.keys(AnimatedImplementation).forEach(key => {
+  it('matches implementation params', (done) => {
+    Object.keys(AnimatedImplementation).forEach((key) => {
       if (AnimatedImplementation[key].length !== AnimatedMock[key].length) {
         done(
           new Error(
diff --git a/Libraries/Animated/src/__tests__/AnimatedNative-test.js b/Libraries/Animated/src/__tests__/AnimatedNative-test.js
index 89024cdb883..40eff3b024c 100644
--- a/Libraries/Animated/src/__tests__/AnimatedNative-test.js
+++ b/Libraries/Animated/src/__tests__/AnimatedNative-test.js
@@ -346,22 +346,30 @@ describe('Native Animated', () => {
         {type: 'addition', input: expect.any(Array)},
       );
       const additionCalls = NativeAnimatedModule.createAnimatedNode.mock.calls.filter(
-        call => call[1].type === 'addition',
+        (call) => call[1].type === 'addition',
       );
       expect(additionCalls.length).toBe(1);
       const additionCall = additionCalls[0];
       const additionNodeTag = additionCall[0];
       const additionConnectionCalls = NativeAnimatedModule.connectAnimatedNodes.mock.calls.filter(
-        call => call[1] === additionNodeTag,
+        (call) => call[1] === additionNodeTag,
       );
       expect(additionConnectionCalls.length).toBe(2);
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         additionCall[1].input[0],
-        {type: 'value', value: 1, offset: 0},
+        {
+          type: 'value',
+          value: 1,
+          offset: 0,
+        },
       );
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         additionCall[1].input[1],
-        {type: 'value', value: 2, offset: 0},
+        {
+          type: 'value',
+          value: 2,
+          offset: 0,
+        },
       );
     });
 
@@ -380,22 +388,30 @@ describe('Native Animated', () => {
         {type: 'subtraction', input: expect.any(Array)},
       );
       const subtractionCalls = NativeAnimatedModule.createAnimatedNode.mock.calls.filter(
-        call => call[1].type === 'subtraction',
+        (call) => call[1].type === 'subtraction',
       );
       expect(subtractionCalls.length).toBe(1);
       const subtractionCall = subtractionCalls[0];
       const subtractionNodeTag = subtractionCall[0];
       const subtractionConnectionCalls = NativeAnimatedModule.connectAnimatedNodes.mock.calls.filter(
-        call => call[1] === subtractionNodeTag,
+        (call) => call[1] === subtractionNodeTag,
       );
       expect(subtractionConnectionCalls.length).toBe(2);
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         subtractionCall[1].input[0],
-        {type: 'value', value: 2, offset: 0},
+        {
+          type: 'value',
+          value: 2,
+          offset: 0,
+        },
       );
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         subtractionCall[1].input[1],
-        {type: 'value', value: 1, offset: 0},
+        {
+          type: 'value',
+          value: 1,
+          offset: 0,
+        },
       );
     });
 
@@ -414,22 +430,30 @@ describe('Native Animated', () => {
         {type: 'multiplication', input: expect.any(Array)},
       );
       const multiplicationCalls = NativeAnimatedModule.createAnimatedNode.mock.calls.filter(
-        call => call[1].type === 'multiplication',
+        (call) => call[1].type === 'multiplication',
       );
       expect(multiplicationCalls.length).toBe(1);
       const multiplicationCall = multiplicationCalls[0];
       const multiplicationNodeTag = multiplicationCall[0];
       const multiplicationConnectionCalls = NativeAnimatedModule.connectAnimatedNodes.mock.calls.filter(
-        call => call[1] === multiplicationNodeTag,
+        (call) => call[1] === multiplicationNodeTag,
       );
       expect(multiplicationConnectionCalls.length).toBe(2);
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         multiplicationCall[1].input[0],
-        {type: 'value', value: 2, offset: 0},
+        {
+          type: 'value',
+          value: 2,
+          offset: 0,
+        },
       );
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         multiplicationCall[1].input[1],
-        {type: 'value', value: 1, offset: 0},
+        {
+          type: 'value',
+          value: 1,
+          offset: 0,
+        },
       );
     });
 
@@ -448,22 +472,30 @@ describe('Native Animated', () => {
         {type: 'division', input: expect.any(Array)},
       );
       const divisionCalls = NativeAnimatedModule.createAnimatedNode.mock.calls.filter(
-        call => call[1].type === 'division',
+        (call) => call[1].type === 'division',
       );
       expect(divisionCalls.length).toBe(1);
       const divisionCall = divisionCalls[0];
       const divisionNodeTag = divisionCall[0];
       const divisionConnectionCalls = NativeAnimatedModule.connectAnimatedNodes.mock.calls.filter(
-        call => call[1] === divisionNodeTag,
+        (call) => call[1] === divisionNodeTag,
       );
       expect(divisionConnectionCalls.length).toBe(2);
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         divisionCall[1].input[0],
-        {type: 'value', value: 4, offset: 0},
+        {
+          type: 'value',
+          value: 4,
+          offset: 0,
+        },
       );
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         divisionCall[1].input[1],
-        {type: 'value', value: 2, offset: 0},
+        {
+          type: 'value',
+          value: 2,
+          offset: 0,
+        },
       );
     });
 
@@ -480,18 +512,22 @@ describe('Native Animated', () => {
         {type: 'modulus', modulus: 4, input: expect.any(Number)},
       );
       const moduloCalls = NativeAnimatedModule.createAnimatedNode.mock.calls.filter(
-        call => call[1].type === 'modulus',
+        (call) => call[1].type === 'modulus',
       );
       expect(moduloCalls.length).toBe(1);
       const moduloCall = moduloCalls[0];
       const moduloNodeTag = moduloCall[0];
       const moduloConnectionCalls = NativeAnimatedModule.connectAnimatedNodes.mock.calls.filter(
-        call => call[1] === moduloNodeTag,
+        (call) => call[1] === moduloNodeTag,
       );
       expect(moduloConnectionCalls.length).toBe(1);
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         moduloCall[1].input,
-        {type: 'value', value: 4, offset: 0},
+        {
+          type: 'value',
+          value: 4,
+          offset: 0,
+        },
       );
     });
 
@@ -525,10 +561,10 @@ describe('Native Animated', () => {
         },
       );
       const interpolationNodeTag = NativeAnimatedModule.createAnimatedNode.mock.calls.find(
-        call => call[1].type === 'interpolation',
+        (call) => call[1].type === 'interpolation',
       )[0];
       const valueNodeTag = NativeAnimatedModule.createAnimatedNode.mock.calls.find(
-        call => call[1].type === 'value',
+        (call) => call[1].type === 'value',
       )[0];
       expect(NativeAnimatedModule.connectAnimatedNodes).toBeCalledWith(
         valueNodeTag,
@@ -577,18 +613,22 @@ describe('Native Animated', () => {
         {type: 'diffclamp', input: expect.any(Number), max: 20, min: 0},
       );
       const diffClampCalls = NativeAnimatedModule.createAnimatedNode.mock.calls.filter(
-        call => call[1].type === 'diffclamp',
+        (call) => call[1].type === 'diffclamp',
       );
       expect(diffClampCalls.length).toBe(1);
       const diffClampCall = diffClampCalls[0];
       const diffClampNodeTag = diffClampCall[0];
       const diffClampConnectionCalls = NativeAnimatedModule.connectAnimatedNodes.mock.calls.filter(
-        call => call[1] === diffClampNodeTag,
+        (call) => call[1] === diffClampNodeTag,
       );
       expect(diffClampConnectionCalls.length).toBe(1);
       expect(NativeAnimatedModule.createAnimatedNode).toBeCalledWith(
         diffClampCall[1].input,
-        {type: 'value', value: 2, offset: 0},
+        {
+          type: 'value',
+          value: 2,
+          offset: 0,
+        },
       );
     });
 
diff --git a/Libraries/Animated/src/__tests__/Easing-test.js b/Libraries/Animated/src/__tests__/Easing-test.js
index 409b1a7c3a8..088c0ca7829 100644
--- a/Libraries/Animated/src/__tests__/Easing-test.js
+++ b/Libraries/Animated/src/__tests__/Easing-test.js
@@ -449,8 +449,8 @@ describe('Easing', () => {
     ],
   };
 
-  Object.keys(Samples).forEach(function(type) {
-    it('should ease ' + type, function() {
+  Object.keys(Samples).forEach(function (type) {
+    it('should ease ' + type, function () {
       const [modeName, easingName, isFunction] = type.split('_');
       let easing = Easing[easingName];
       if (isFunction !== undefined) {
diff --git a/Libraries/Animated/src/__tests__/bezier-test.js b/Libraries/Animated/src/__tests__/bezier-test.js
index e7be582a524..846edc12828 100644
--- a/Libraries/Animated/src/__tests__/bezier-test.js
+++ b/Libraries/Animated/src/__tests__/bezier-test.js
@@ -19,7 +19,7 @@
 
 const bezier = require('../bezier');
 
-const identity = function(x) {
+const identity = function (x) {
   return x;
 };
 
@@ -28,7 +28,7 @@ function assertClose(a, b, precision = 3) {
 }
 
 function makeAssertCloseWithPrecision(precision) {
-  return function(a, b) {
+  return function (a, b) {
     assertClose(a, b, precision);
   };
 }
@@ -44,43 +44,43 @@ function allEquals(be1, be2, samples, assertion) {
 }
 
 function repeat(n) {
-  return function(f) {
+  return function (f) {
     for (let i = 0; i < n; ++i) {
       f();
     }
   };
 }
 
-describe('bezier', function() {
-  it('should be a function', function() {
+describe('bezier', function () {
+  it('should be a function', function () {
     expect(typeof bezier === 'function').toBe(true);
   });
-  it('should creates an object', function() {
+  it('should creates an object', function () {
     expect(typeof bezier(0, 0, 1, 1) === 'function').toBe(true);
   });
-  it('should fail with wrong arguments', function() {
-    expect(function() {
+  it('should fail with wrong arguments', function () {
+    expect(function () {
       bezier(0.5, 0.5, -5, 0.5);
     }).toThrow();
-    expect(function() {
+    expect(function () {
       bezier(0.5, 0.5, 5, 0.5);
     }).toThrow();
-    expect(function() {
+    expect(function () {
       bezier(-2, 0.5, 0.5, 0.5);
     }).toThrow();
-    expect(function() {
+    expect(function () {
       bezier(2, 0.5, 0.5, 0.5);
     }).toThrow();
   });
-  describe('linear curves', function() {
-    it('should be linear', function() {
+  describe('linear curves', function () {
+    it('should be linear', function () {
       allEquals(bezier(0, 0, 1, 1), bezier(1, 1, 0, 0), 100);
       allEquals(bezier(0, 0, 1, 1), identity, 100);
     });
   });
-  describe('common properties', function() {
-    it('should be the right value at extremes', function() {
-      repeat(10)(function() {
+  describe('common properties', function () {
+    it('should be the right value at extremes', function () {
+      repeat(10)(function () {
         const a = Math.random(),
           b = 2 * Math.random() - 0.5,
           c = Math.random(),
@@ -91,24 +91,24 @@ describe('bezier', function() {
       });
     });
 
-    it('should approach the projected value of its x=y projected curve', function() {
-      repeat(10)(function() {
+    it('should approach the projected value of its x=y projected curve', function () {
+      repeat(10)(function () {
         const a = Math.random(),
           b = Math.random(),
           c = Math.random(),
           d = Math.random();
         const easing = bezier(a, b, c, d);
         const projected = bezier(b, a, d, c);
-        const composed = function(x) {
+        const composed = function (x) {
           return projected(easing(x));
         };
         allEquals(identity, composed, 100, makeAssertCloseWithPrecision(2));
       });
     });
   });
-  describe('two same instances', function() {
-    it('should be strictly equals', function() {
-      repeat(10)(function() {
+  describe('two same instances', function () {
+    it('should be strictly equals', function () {
+      repeat(10)(function () {
         const a = Math.random(),
           b = 2 * Math.random() - 0.5,
           c = Math.random(),
@@ -117,9 +117,9 @@ describe('bezier', function() {
       });
     });
   });
-  describe('symmetric curves', function() {
-    it('should have a central value y~=0.5 at x=0.5', function() {
-      repeat(10)(function() {
+  describe('symmetric curves', function () {
+    it('should have a central value y~=0.5 at x=0.5', function () {
+      repeat(10)(function () {
         const a = Math.random(),
           b = 2 * Math.random() - 0.5,
           c = 1 - a,
@@ -128,14 +128,14 @@ describe('bezier', function() {
         assertClose(easing(0.5), 0.5, 2);
       });
     });
-    it('should be symmetrical', function() {
-      repeat(10)(function() {
+    it('should be symmetrical', function () {
+      repeat(10)(function () {
         const a = Math.random(),
           b = 2 * Math.random() - 0.5,
           c = 1 - a,
           d = 1 - b;
         const easing = bezier(a, b, c, d);
-        const sym = function(x) {
+        const sym = function (x) {
           return 1 - easing(1 - x);
         };
         allEquals(easing, sym, 100, makeAssertCloseWithPrecision(2));
diff --git a/Libraries/Animated/src/createAnimatedComponent.js b/Libraries/Animated/src/createAnimatedComponent.js
index 099e71c8faa..7e7266713d9 100644
--- a/Libraries/Animated/src/createAnimatedComponent.js
+++ b/Libraries/Animated/src/createAnimatedComponent.js
@@ -56,7 +56,7 @@ function createAnimatedComponent<Props: {+[string]: mixed, ...}, Instance>(
     }
 
     _detachNativeEvents() {
-      this._eventDetachers.forEach(remove => remove());
+      this._eventDetachers.forEach((remove) => remove());
       this._eventDetachers = [];
     }
 
@@ -140,7 +140,7 @@ function createAnimatedComponent<Props: {+[string]: mixed, ...}, Instance>(
 
     _setComponentRef = setAndForwardRef({
       getForwardedRef: () => this.props.forwardedRef,
-      setLocalRef: ref => {
+      setLocalRef: (ref) => {
         this._prevComponent = this._component;
         this._component = ref;
 
diff --git a/Libraries/Animated/src/nodes/AnimatedInterpolation.js b/Libraries/Animated/src/nodes/AnimatedInterpolation.js
index a32bb9c2a7c..5b4d538cbe9 100644
--- a/Libraries/Animated/src/nodes/AnimatedInterpolation.js
+++ b/Libraries/Animated/src/nodes/AnimatedInterpolation.js
@@ -30,7 +30,7 @@ export type InterpolationConfigType = {
   extrapolateRight?: ExtrapolateType,
 };
 
-const linear = t => t;
+const linear = (t) => t;
 
 /**
  * Very handy helper to map input ranges to output ranges with an easing
@@ -75,7 +75,7 @@ function createInterpolation(
     extrapolateRight = config.extrapolate;
   }
 
-  return input => {
+  return (input) => {
     invariant(
       typeof input === 'number',
       'Cannot interpolation an input which is not a number',
@@ -209,7 +209,7 @@ function createInterpolationFromStringOutputRange(
    * guard against this possibility.
    */
   const outputRanges = outputRange[0].match(stringShapeRegex).map(() => []);
-  outputRange.forEach(value => {
+  outputRange.forEach((value) => {
     /* $FlowFixMe(>=0.18.0): `value.match()` can return `null`. Need to guard
      * against this possibility.
      */
@@ -233,7 +233,7 @@ function createInterpolationFromStringOutputRange(
   // round the opacity (4th column).
   const shouldRound = isRgbOrRgba(outputRange[0]);
 
-  return input => {
+  return (input) => {
     let i = 0;
     // 'rgba(0, 100, 200, 0)'
     // ->
diff --git a/Libraries/Animated/src/nodes/AnimatedNode.js b/Libraries/Animated/src/nodes/AnimatedNode.js
index 7371d49fd5b..a3f92481332 100644
--- a/Libraries/Animated/src/nodes/AnimatedNode.js
+++ b/Libraries/Animated/src/nodes/AnimatedNode.js
@@ -121,7 +121,7 @@ class AnimatedNode {
     NativeAnimatedAPI.startListeningToAnimatedNodeValue(this.__getNativeTag());
     this.__nativeAnimatedValueListener = NativeAnimatedHelper.nativeEventEmitter.addListener(
       'onAnimatedValueUpdate',
-      data => {
+      (data) => {
         if (data.tag !== this.__getNativeTag()) {
           return;
         }
diff --git a/Libraries/Animated/src/nodes/AnimatedTransform.js b/Libraries/Animated/src/nodes/AnimatedTransform.js
index 8c2dd25852f..0bdbd65bd29 100644
--- a/Libraries/Animated/src/nodes/AnimatedTransform.js
+++ b/Libraries/Animated/src/nodes/AnimatedTransform.js
@@ -23,7 +23,7 @@ class AnimatedTransform extends AnimatedWithChildren {
   }
 
   __makeNative() {
-    this._transforms.forEach(transform => {
+    this._transforms.forEach((transform) => {
       for (const key in transform) {
         const value = transform[key];
         if (value instanceof AnimatedNode) {
@@ -35,7 +35,7 @@ class AnimatedTransform extends AnimatedWithChildren {
   }
 
   __getValue(): $ReadOnlyArray<Object> {
-    return this._transforms.map(transform => {
+    return this._transforms.map((transform) => {
       const result = {};
       for (const key in transform) {
         const value = transform[key];
@@ -50,7 +50,7 @@ class AnimatedTransform extends AnimatedWithChildren {
   }
 
   __getAnimatedValue(): $ReadOnlyArray<Object> {
-    return this._transforms.map(transform => {
+    return this._transforms.map((transform) => {
       const result = {};
       for (const key in transform) {
         const value = transform[key];
@@ -66,7 +66,7 @@ class AnimatedTransform extends AnimatedWithChildren {
   }
 
   __attach(): void {
-    this._transforms.forEach(transform => {
+    this._transforms.forEach((transform) => {
       for (const key in transform) {
         const value = transform[key];
         if (value instanceof AnimatedNode) {
@@ -77,7 +77,7 @@ class AnimatedTransform extends AnimatedWithChildren {
   }
 
   __detach(): void {
-    this._transforms.forEach(transform => {
+    this._transforms.forEach((transform) => {
       for (const key in transform) {
         const value = transform[key];
         if (value instanceof AnimatedNode) {
@@ -91,7 +91,7 @@ class AnimatedTransform extends AnimatedWithChildren {
   __getNativeConfig(): any {
     const transConfigs = [];
 
-    this._transforms.forEach(transform => {
+    this._transforms.forEach((transform) => {
       for (const key in transform) {
         const value = transform[key];
         if (value instanceof AnimatedNode) {
diff --git a/Libraries/Animated/src/nodes/AnimatedValue.js b/Libraries/Animated/src/nodes/AnimatedValue.js
index 7306fc77b94..f83fbf0c98e 100644
--- a/Libraries/Animated/src/nodes/AnimatedValue.js
+++ b/Libraries/Animated/src/nodes/AnimatedValue.js
@@ -57,7 +57,7 @@ function _flush(rootNode: AnimatedValue): void {
   }
   findAnimatedStyles(rootNode);
   /* $FlowFixMe */
-  animatedStyles.forEach(animatedStyle => animatedStyle.update());
+  animatedStyles.forEach((animatedStyle) => animatedStyle.update());
 }
 
 /**
@@ -208,12 +208,12 @@ class AnimatedValue extends AnimatedWithChildren {
     this._animation = animation;
     animation.start(
       this._value,
-      value => {
+      (value) => {
         // Natively driven animations will never call into that callback, therefore we can always
         // pass flush = true to allow the updated value to propagate to native with setNativeProps
         this._updateValue(value, true /* flush */);
       },
-      result => {
+      (result) => {
         this._animation = null;
         if (handle !== null) {
           InteractionManager.clearInteractionHandle(handle);
diff --git a/Libraries/Animated/src/polyfills/InteractionManager.js b/Libraries/Animated/src/polyfills/InteractionManager.js
index c2247c762a3..9e68781767e 100644
--- a/Libraries/Animated/src/polyfills/InteractionManager.js
+++ b/Libraries/Animated/src/polyfills/InteractionManager.js
@@ -10,6 +10,6 @@
 'use strict';
 
 module.exports = {
-  createInteractionHandle: function() {},
-  clearInteractionHandle: function() {},
+  createInteractionHandle: function () {},
+  clearInteractionHandle: function () {},
 };
diff --git a/Libraries/Animated/src/polyfills/Set.js b/Libraries/Animated/src/polyfills/Set.js
index 39205b8f9f9..d64df222090 100644
--- a/Libraries/Animated/src/polyfills/Set.js
+++ b/Libraries/Animated/src/polyfills/Set.js
@@ -13,13 +13,13 @@ function SetPolyfill() {
   this._cache = [];
 }
 
-SetPolyfill.prototype.add = function(e) {
+SetPolyfill.prototype.add = function (e) {
   if (this._cache.indexOf(e) === -1) {
     this._cache.push(e);
   }
 };
 
-SetPolyfill.prototype.forEach = function(cb) {
+SetPolyfill.prototype.forEach = function (cb) {
   this._cache.forEach(cb);
 };
 
diff --git a/Libraries/Animated/src/polyfills/flattenStyle.js b/Libraries/Animated/src/polyfills/flattenStyle.js
index b50057af284..63d9483e2a2 100644
--- a/Libraries/Animated/src/polyfills/flattenStyle.js
+++ b/Libraries/Animated/src/polyfills/flattenStyle.js
@@ -8,6 +8,6 @@
  */
 
 'use strict';
-module.exports = function(style) {
+module.exports = function (style) {
   return style;
 };
diff --git a/Libraries/AppState/AppState.js b/Libraries/AppState/AppState.js
index b5fb59bd9fd..c00936f6038 100644
--- a/Libraries/AppState/AppState.js
+++ b/Libraries/AppState/AppState.js
@@ -47,7 +47,7 @@ class AppState extends NativeEventEmitter {
     // prop is up to date, we have to register an observer that updates it
     // whenever the state changes, even if nobody cares. We should just
     // deprecate the `currentState` property and get rid of this.
-    this.addListener('appStateDidChange', appStateData => {
+    this.addListener('appStateDidChange', (appStateData) => {
       eventUpdated = true;
       this.currentState = appStateData.app_state;
     });
@@ -55,7 +55,7 @@ class AppState extends NativeEventEmitter {
     // TODO: see above - this request just populates the value of `currentState`
     // when the module is first initialized. Would be better to get rid of the
     // prop and expose `getCurrentAppState` method directly.
-    NativeAppState.getCurrentAppState(appStateData => {
+    NativeAppState.getCurrentAppState((appStateData) => {
       // It's possible that the state will have changed here & listeners need to be notified
       if (!eventUpdated && this.currentState !== appStateData.app_state) {
         this.currentState = appStateData.app_state;
@@ -86,7 +86,7 @@ class AppState extends NativeEventEmitter {
       case 'change': {
         this._eventHandlers[type].set(
           handler,
-          this.addListener('appStateDidChange', appStateData => {
+          this.addListener('appStateDidChange', (appStateData) => {
             handler(appStateData.app_state);
           }),
         );
@@ -104,7 +104,7 @@ class AppState extends NativeEventEmitter {
       case 'focus': {
         this._eventHandlers[type].set(
           handler,
-          this.addListener('appStateFocusChange', hasFocus => {
+          this.addListener('appStateFocusChange', (hasFocus) => {
             if (type === 'blur' && !hasFocus) {
               handler();
             }
diff --git a/Libraries/BatchedBridge/MessageQueue.js b/Libraries/BatchedBridge/MessageQueue.js
index 3756b083fbd..79cbb8f19e2 100644
--- a/Libraries/BatchedBridge/MessageQueue.js
+++ b/Libraries/BatchedBridge/MessageQueue.js
@@ -86,7 +86,7 @@ class MessageQueue {
 
   static spy(spyOrToggle: boolean | ((data: SpyData) => void)) {
     if (spyOrToggle === true) {
-      MessageQueue.prototype.__spy = info => {
+      MessageQueue.prototype.__spy = (info) => {
         console.log(
           `${info.type === TO_JS ? 'N->JS' : 'JS->N'} : ` +
             `${info.module ? info.module + '.' : ''}${info.method}` +
@@ -148,7 +148,7 @@ class MessageQueue {
     this._lazyCallableModules[name] = () => module;
   }
 
-  registerLazyCallableModule(name: string, factory: void => Object) {
+  registerLazyCallableModule(name: string, factory: (void) => Object) {
     let module: Object;
     let getValue: ?(void) => Object = factory;
     this._lazyCallableModules[name] = () => {
@@ -253,7 +253,7 @@ class MessageQueue {
       // folly-convertible.  As a special case, if a prop value is a
       // function it is permitted here, and special-cased in the
       // conversion.
-      const isValidArgument = val => {
+      const isValidArgument = (val) => {
         const t = typeof val;
         if (
           t === 'undefined' ||
diff --git a/Libraries/BatchedBridge/NativeModules.js b/Libraries/BatchedBridge/NativeModules.js
index 541012582c0..cf77b10cc4e 100644
--- a/Libraries/BatchedBridge/NativeModules.js
+++ b/Libraries/BatchedBridge/NativeModules.js
@@ -106,8 +106,8 @@ function genMethod(moduleID: number, methodID: number, type: MethodType) {
           moduleID,
           methodID,
           args,
-          data => resolve(data),
-          errorData =>
+          (data) => resolve(data),
+          (errorData) =>
             reject(updateErrorWithErrorData(errorData, enqueueingFrameError)),
         );
       });
diff --git a/Libraries/BatchedBridge/__mocks__/MessageQueueTestModule.js b/Libraries/BatchedBridge/__mocks__/MessageQueueTestModule.js
index 667799a42f4..d0e5477822e 100644
--- a/Libraries/BatchedBridge/__mocks__/MessageQueueTestModule.js
+++ b/Libraries/BatchedBridge/__mocks__/MessageQueueTestModule.js
@@ -15,8 +15,8 @@
  * cases.
  */
 const MessageQueueTestModule = {
-  testHook1: function() {},
-  testHook2: function() {},
+  testHook1: function () {},
+  testHook2: function () {},
 };
 
 module.exports = MessageQueueTestModule;
diff --git a/Libraries/BatchedBridge/__tests__/MessageQueue-test.js b/Libraries/BatchedBridge/__tests__/MessageQueue-test.js
index 42abd597dd8..fe57b0d2459 100644
--- a/Libraries/BatchedBridge/__tests__/MessageQueue-test.js
+++ b/Libraries/BatchedBridge/__tests__/MessageQueue-test.js
@@ -30,8 +30,8 @@ const assertQueue = (flushedQueue, index, moduleID, methodID, params) => {
 //
 // [ ] Local modules that throw exceptions are gracefully caught. In that case
 // local callbacks stored by IDs are cleaned up.
-describe('MessageQueue', function() {
-  beforeEach(function() {
+describe('MessageQueue', function () {
+  beforeEach(function () {
     jest.resetModules();
     MessageQueue = require('../MessageQueue');
     MessageQueueTestModule = require('../__mocks__/MessageQueueTestModule');
@@ -81,13 +81,25 @@ describe('MessageQueue', function() {
   });
 
   it('should throw when calling the same callback twice', () => {
-    queue.enqueueNativeCall(0, 1, [], () => {}, () => {});
+    queue.enqueueNativeCall(
+      0,
+      1,
+      [],
+      () => {},
+      () => {},
+    );
     queue.__invokeCallback(1, []);
     expect(() => queue.__invokeCallback(1, [])).toThrow();
   });
 
   it('should throw when calling both success and failure callback', () => {
-    queue.enqueueNativeCall(0, 1, [], () => {}, () => {});
+    queue.enqueueNativeCall(
+      0,
+      1,
+      [],
+      () => {},
+      () => {},
+    );
     queue.__invokeCallback(1, []);
     expect(() => queue.__invokeCallback(0, [])).toThrow();
   });
@@ -128,7 +140,7 @@ describe('MessageQueue', function() {
 
   it('should check if the global error handler is not overridden by the DebuggerInternal object', () => {
     const dummyModule = {
-      dummy: function() {},
+      dummy: function () {},
     };
     const name = 'emptyModuleName';
     const factory = jest.fn(() => dummyModule);
@@ -140,7 +152,7 @@ describe('MessageQueue', function() {
 
   it('should check if the global error handler is overridden by the DebuggerInternal object', () => {
     const dummyModule = {
-      dummy: function() {},
+      dummy: function () {},
     };
     const name = 'emptyModuleName';
     const factory = jest.fn(() => dummyModule);
diff --git a/Libraries/BatchedBridge/__tests__/NativeModules-test.js b/Libraries/BatchedBridge/__tests__/NativeModules-test.js
index bedff6127d9..35f1c43764a 100644
--- a/Libraries/BatchedBridge/__tests__/NativeModules-test.js
+++ b/Libraries/BatchedBridge/__tests__/NativeModules-test.js
@@ -38,8 +38,8 @@ const assertQueue = (flushedQueue, index, moduleID, methodID, params) => {
 // success callbacks are cleaned up.
 //
 // [ ] Remote invocation throws if not supplying an error callback.
-describe('MessageQueue', function() {
-  beforeEach(function() {
+describe('MessageQueue', function () {
+  beforeEach(function () {
     jest.resetModules();
 
     global.__fbBatchedBridgeConfig = require('../__mocks__/MessageQueueTestConfig');
@@ -55,7 +55,7 @@ describe('MessageQueue', function() {
     assertQueue(flushedQueue, 0, 0, 0, ['foo']);
   });
 
-  it('should make round trip and clear memory', function() {
+  it('should make round trip and clear memory', function () {
     const onFail = jest.fn();
     const onSucc = jest.fn();
 
@@ -101,7 +101,7 @@ describe('MessageQueue', function() {
     // Handle the first remote invocation by signaling failure.
     BatchedBridge.__invokeCallback(firstFailCBID, ['firstFailure']);
     // The failure callback was already invoked, the success is no longer valid
-    expect(function() {
+    expect(function () {
       BatchedBridge.__invokeCallback(firstSuccCBID, ['firstSucc']);
     }).toThrow();
     expect(onFail.mock.calls.length).toBe(1);
@@ -110,14 +110,14 @@ describe('MessageQueue', function() {
     // Handle the second remote invocation by signaling success.
     BatchedBridge.__invokeCallback(secondSuccCBID, ['secondSucc']);
     // The success callback was already invoked, the fail cb is no longer valid
-    expect(function() {
+    expect(function () {
       BatchedBridge.__invokeCallback(secondFailCBID, ['secondFail']);
     }).toThrow();
     expect(onFail.mock.calls.length).toBe(1);
     expect(onSucc.mock.calls.length).toBe(1);
   });
 
-  it('promise-returning methods (type=promise)', async function() {
+  it('promise-returning methods (type=promise)', async function () {
     // Perform communication
     const promise1 = NativeModules.RemoteModule1.promiseReturningMethod(
       'paloAlto',
@@ -162,7 +162,7 @@ describe('MessageQueue', function() {
     // Handle the first remote invocation by signaling failure.
     BatchedBridge.__invokeCallback(firstFailCBID, [{message: 'firstFailure'}]);
     // The failure callback was already invoked, the success is no longer valid
-    expect(function() {
+    expect(function () {
       BatchedBridge.__invokeCallback(firstSuccCBID, ['firstSucc']);
     }).toThrow();
     await expect(promise1).rejects.toBeInstanceOf(Error);
@@ -171,18 +171,18 @@ describe('MessageQueue', function() {
     // Handle the second remote invocation by signaling success.
     BatchedBridge.__invokeCallback(secondSuccCBID, ['secondSucc']);
     // The success callback was already invoked, the fail cb is no longer valid
-    expect(function() {
+    expect(function () {
       BatchedBridge.__invokeCallback(secondFailCBID, ['secondFail']);
     }).toThrow();
     await promise2;
   });
 
   describe('sync methods', () => {
-    afterEach(function() {
+    afterEach(function () {
       delete global.nativeCallSyncHook;
     });
 
-    it('throwing an exception', function() {
+    it('throwing an exception', function () {
       global.nativeCallSyncHook = jest.fn(() => {
         throw new Error('firstFailure');
       });
@@ -206,7 +206,7 @@ describe('MessageQueue', function() {
       });
     });
 
-    it('returning a value', function() {
+    it('returning a value', function () {
       global.nativeCallSyncHook = jest.fn(() => {
         return 'secondSucc';
       });
diff --git a/Libraries/Blob/BlobManager.js b/Libraries/Blob/BlobManager.js
index e12512392a3..da32f4b4efc 100644
--- a/Libraries/Blob/BlobManager.js
+++ b/Libraries/Blob/BlobManager.js
@@ -25,7 +25,7 @@ import invariant from 'invariant';
  * http://stackoverflow.com/questions/105034
  */
 function uuidv4(): string {
-  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
     const r = (Math.random() * 16) | 0,
       v = c == 'x' ? r : (r & 0x3) | 0x8;
     return v.toString(16);
@@ -66,7 +66,7 @@ class BlobManager {
     invariant(NativeBlobModule, 'NativeBlobModule is available.');
 
     const blobId = uuidv4();
-    const items = parts.map(part => {
+    const items = parts.map((part) => {
       if (
         part instanceof ArrayBuffer ||
         (global.ArrayBufferView && part instanceof global.ArrayBufferView)
diff --git a/Libraries/Blob/FileReader.js b/Libraries/Blob/FileReader.js
index 15a8b44d0bb..93e31533821 100644
--- a/Libraries/Blob/FileReader.js
+++ b/Libraries/Blob/FileReader.js
@@ -62,7 +62,7 @@ class FileReader extends (EventTarget(...READER_EVENTS): any) {
   }
 
   _clearSubscriptions(): void {
-    this._subscriptions.forEach(sub => sub.remove());
+    this._subscriptions.forEach((sub) => sub.remove());
     this._subscriptions = [];
   }
 
@@ -102,7 +102,7 @@ class FileReader extends (EventTarget(...READER_EVENTS): any) {
         this._result = text;
         this._setReadyState(DONE);
       },
-      error => {
+      (error) => {
         if (this._aborted) {
           return;
         }
@@ -129,7 +129,7 @@ class FileReader extends (EventTarget(...READER_EVENTS): any) {
         this._result = text;
         this._setReadyState(DONE);
       },
-      error => {
+      (error) => {
         if (this._aborted) {
           return;
         }
diff --git a/Libraries/Blob/URL.js b/Libraries/Blob/URL.js
index f2b6f7f277c..18e70460e21 100644
--- a/Libraries/Blob/URL.js
+++ b/Libraries/Blob/URL.js
@@ -58,7 +58,7 @@ export class URLSearchParams {
 
   constructor(params: any) {
     if (typeof params === 'object') {
-      Object.keys(params).forEach(key => this.append(key, params[key]));
+      Object.keys(params).forEach((key) => this.append(key, params[key]));
     }
   }
 
@@ -119,9 +119,7 @@ export class URL {
     if (BLOB_URL_PREFIX === null) {
       throw new Error('Cannot create URL for blob!');
     }
-    return `${BLOB_URL_PREFIX}${blob.data.blobId}?offset=${
-      blob.data.offset
-    }&size=${blob.size}`;
+    return `${BLOB_URL_PREFIX}${blob.data.blobId}?offset=${blob.data.offset}&size=${blob.size}`;
   }
 
   static revokeObjectURL(url: string) {
diff --git a/Libraries/Blob/__tests__/Blob-test.js b/Libraries/Blob/__tests__/Blob-test.js
index 42aea6f05e5..0ec3d8904d8 100644
--- a/Libraries/Blob/__tests__/Blob-test.js
+++ b/Libraries/Blob/__tests__/Blob-test.js
@@ -16,7 +16,7 @@ jest.setMock('../../BatchedBridge/NativeModules', {
 
 const Blob = require('../Blob');
 
-describe('Blob', function() {
+describe('Blob', function () {
   it('should create empty blob', () => {
     const blob = new Blob();
     expect(blob).toBeInstanceOf(Blob);
diff --git a/Libraries/Blob/__tests__/BlobManager-test.js b/Libraries/Blob/__tests__/BlobManager-test.js
index e711e68f956..bc788cdbf61 100644
--- a/Libraries/Blob/__tests__/BlobManager-test.js
+++ b/Libraries/Blob/__tests__/BlobManager-test.js
@@ -17,7 +17,7 @@ jest.setMock('../../BatchedBridge/NativeModules', {
 const Blob = require('../Blob');
 const BlobManager = require('../BlobManager');
 
-describe('BlobManager', function() {
+describe('BlobManager', function () {
   it('should create blob from parts', () => {
     const blob = BlobManager.createFromParts([], {type: 'text/html'});
     expect(blob).toBeInstanceOf(Blob);
diff --git a/Libraries/Blob/__tests__/File-test.js b/Libraries/Blob/__tests__/File-test.js
index eefbe2864ed..ee097235e22 100644
--- a/Libraries/Blob/__tests__/File-test.js
+++ b/Libraries/Blob/__tests__/File-test.js
@@ -17,8 +17,8 @@ jest.setMock('../../BatchedBridge/NativeModules', {
 const Blob = require('../Blob');
 const File = require('../File');
 
-describe('babel 7 smoke test', function() {
-  it('should be able to extend a class with native name', function() {
+describe('babel 7 smoke test', function () {
+  it('should be able to extend a class with native name', function () {
     let called = false;
     class Array {
       constructor() {
@@ -40,14 +40,14 @@ describe('babel 7 smoke test', function() {
   });
 });
 
-describe('Blob', function() {
-  it('regression caused by circular dep && babel 7', function() {
+describe('Blob', function () {
+  it('regression caused by circular dep && babel 7', function () {
     const blob = new Blob([], {type: 'image/jpeg'});
     expect(blob).toBeInstanceOf(Blob);
   });
 });
 
-describe('File', function() {
+describe('File', function () {
   it('should create empty file', () => {
     const file = new File([], 'test.jpg');
     expect(file).toBeInstanceOf(File);
diff --git a/Libraries/Blob/__tests__/FileReader-test.js b/Libraries/Blob/__tests__/FileReader-test.js
index 4e73df3c569..3ccf4924242 100644
--- a/Libraries/Blob/__tests__/FileReader-test.js
+++ b/Libraries/Blob/__tests__/FileReader-test.js
@@ -18,7 +18,7 @@ jest.unmock('event-target-shim').setMock('../../BatchedBridge/NativeModules', {
 const Blob = require('../Blob');
 const FileReader = require('../FileReader');
 
-describe('FileReader', function() {
+describe('FileReader', function () {
   it('should read blob as text', async () => {
     const e = await new Promise((resolve, reject) => {
       const reader = new FileReader();
diff --git a/Libraries/Blob/__tests__/URL-test.js b/Libraries/Blob/__tests__/URL-test.js
index 713ceeea0ef..fa7e234385e 100644
--- a/Libraries/Blob/__tests__/URL-test.js
+++ b/Libraries/Blob/__tests__/URL-test.js
@@ -12,7 +12,7 @@
 
 const URL = require('../URL').URL;
 
-describe('URL', function() {
+describe('URL', function () {
   it('should pass Mozilla Dev Network examples', () => {
     const a = new URL('/', 'https://developer.mozilla.org');
     expect(a.href).toBe('https://developer.mozilla.org/');
diff --git a/Libraries/Components/AccessibilityInfo/AccessibilityInfo.android.js b/Libraries/Components/AccessibilityInfo/AccessibilityInfo.android.js
index 7d7e92a444b..c27fdadc33a 100644
--- a/Libraries/Components/AccessibilityInfo/AccessibilityInfo.android.js
+++ b/Libraries/Components/AccessibilityInfo/AccessibilityInfo.android.js
@@ -41,25 +41,25 @@ const AccessibilityInfo = {
   /**
    * iOS only
    */
-  isBoldTextEnabled: function(): Promise<boolean> {
+  isBoldTextEnabled: function (): Promise<boolean> {
     return Promise.resolve(false);
   },
 
   /**
    * iOS only
    */
-  isGrayscaleEnabled: function(): Promise<boolean> {
+  isGrayscaleEnabled: function (): Promise<boolean> {
     return Promise.resolve(false);
   },
 
   /**
    * iOS only
    */
-  isInvertColorsEnabled: function(): Promise<boolean> {
+  isInvertColorsEnabled: function (): Promise<boolean> {
     return Promise.resolve(false);
   },
 
-  isReduceMotionEnabled: function(): Promise<boolean> {
+  isReduceMotionEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityInfo) {
         NativeAccessibilityInfo.isReduceMotionEnabled(resolve);
@@ -72,11 +72,11 @@ const AccessibilityInfo = {
   /**
    * iOS only
    */
-  isReduceTransparencyEnabled: function(): Promise<boolean> {
+  isReduceTransparencyEnabled: function (): Promise<boolean> {
     return Promise.resolve(false);
   },
 
-  isScreenReaderEnabled: function(): Promise<boolean> {
+  isScreenReaderEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityInfo) {
         NativeAccessibilityInfo.isTouchExplorationEnabled(resolve);
@@ -98,7 +98,7 @@ const AccessibilityInfo = {
     return this.isScreenReaderEnabled;
   },
 
-  addEventListener: function(
+  addEventListener: function (
     eventName: ChangeEventName,
     handler: Function,
   ): void {
@@ -107,14 +107,14 @@ const AccessibilityInfo = {
     if (eventName === 'change' || eventName === 'screenReaderChanged') {
       listener = RCTDeviceEventEmitter.addListener(
         TOUCH_EXPLORATION_EVENT,
-        enabled => {
+        (enabled) => {
           handler(enabled);
         },
       );
     } else if (eventName === 'reduceMotionChanged') {
       listener = RCTDeviceEventEmitter.addListener(
         REDUCE_MOTION_EVENT,
-        enabled => {
+        (enabled) => {
           handler(enabled);
         },
       );
@@ -123,7 +123,7 @@ const AccessibilityInfo = {
     _subscriptions.set(handler, listener);
   },
 
-  removeEventListener: function(
+  removeEventListener: function (
     eventName: ChangeEventName,
     handler: Function,
   ): void {
@@ -140,7 +140,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#setaccessibilityfocus
    */
-  setAccessibilityFocus: function(reactTag: number): void {
+  setAccessibilityFocus: function (reactTag: number): void {
     UIManager.sendAccessibilityEvent(
       reactTag,
       UIManager.getConstants().AccessibilityEventTypes.typeViewFocused,
@@ -152,7 +152,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#announceforaccessibility
    */
-  announceForAccessibility: function(announcement: string): void {
+  announceForAccessibility: function (announcement: string): void {
     if (NativeAccessibilityInfo) {
       NativeAccessibilityInfo.announceForAccessibility(announcement);
     }
diff --git a/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js b/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js
index c09b16d470f..1550c0e46b8 100644
--- a/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js
+++ b/Libraries/Components/AccessibilityInfo/AccessibilityInfo.ios.js
@@ -57,7 +57,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#isBoldTextEnabled
    */
-  isBoldTextEnabled: function(): Promise<boolean> {
+  isBoldTextEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityManager) {
         NativeAccessibilityManager.getCurrentBoldTextState(resolve, reject);
@@ -75,7 +75,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#isGrayscaleEnabled
    */
-  isGrayscaleEnabled: function(): Promise<boolean> {
+  isGrayscaleEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityManager) {
         NativeAccessibilityManager.getCurrentGrayscaleState(resolve, reject);
@@ -93,7 +93,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#isInvertColorsEnabled
    */
-  isInvertColorsEnabled: function(): Promise<boolean> {
+  isInvertColorsEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityManager) {
         NativeAccessibilityManager.getCurrentInvertColorsState(resolve, reject);
@@ -111,7 +111,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#isReduceMotionEnabled
    */
-  isReduceMotionEnabled: function(): Promise<boolean> {
+  isReduceMotionEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityManager) {
         NativeAccessibilityManager.getCurrentReduceMotionState(resolve, reject);
@@ -129,7 +129,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#isReduceTransparencyEnabled
    */
-  isReduceTransparencyEnabled: function(): Promise<boolean> {
+  isReduceTransparencyEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityManager) {
         NativeAccessibilityManager.getCurrentReduceTransparencyState(
@@ -150,7 +150,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#isScreenReaderEnabled
    */
-  isScreenReaderEnabled: function(): Promise<boolean> {
+  isScreenReaderEnabled: function (): Promise<boolean> {
     return new Promise((resolve, reject) => {
       if (NativeAccessibilityManager) {
         NativeAccessibilityManager.getCurrentVoiceOverState(resolve, reject);
@@ -203,7 +203,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#addeventlistener
    */
-  addEventListener: function(
+  addEventListener: function (
     eventName: ChangeEventName,
     handler: Function,
   ): Object {
@@ -233,7 +233,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#setaccessibilityfocus
    */
-  setAccessibilityFocus: function(reactTag: number): void {
+  setAccessibilityFocus: function (reactTag: number): void {
     if (NativeAccessibilityManager) {
       NativeAccessibilityManager.setAccessibilityFocus(reactTag);
     }
@@ -244,7 +244,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#announceforaccessibility
    */
-  announceForAccessibility: function(announcement: string): void {
+  announceForAccessibility: function (announcement: string): void {
     if (NativeAccessibilityManager) {
       NativeAccessibilityManager.announceForAccessibility(announcement);
     }
@@ -255,7 +255,7 @@ const AccessibilityInfo = {
    *
    * See https://reactnative.dev/docs/accessibilityinfo.html#removeeventlistener
    */
-  removeEventListener: function(
+  removeEventListener: function (
     eventName: ChangeEventName,
     handler: Function,
   ): void {
diff --git a/Libraries/Components/ActivityIndicator/ActivityIndicator.js b/Libraries/Components/ActivityIndicator/ActivityIndicator.js
index 9d0df8f0a73..62bc6664305 100644
--- a/Libraries/Components/ActivityIndicator/ActivityIndicator.js
+++ b/Libraries/Components/ActivityIndicator/ActivityIndicator.js
@@ -101,10 +101,7 @@ const ActivityIndicator = (props: Props, forwardedRef?: any) => {
   return (
     <View
       onLayout={onLayout}
-      style={StyleSheet.compose(
-        styles.container,
-        style,
-      )}>
+      style={StyleSheet.compose(styles.container, style)}>
       {Platform.OS === 'android' ? (
         // $FlowFixMe Flow doesn't know when this is the android component
         <PlatformActivityIndicator {...nativeProps} {...androidProps} />
diff --git a/Libraries/Components/AppleTV/TVEventHandler.js b/Libraries/Components/AppleTV/TVEventHandler.js
index d5cd47afdce..d28483ab2fa 100644
--- a/Libraries/Components/AppleTV/TVEventHandler.js
+++ b/Libraries/Components/AppleTV/TVEventHandler.js
@@ -30,7 +30,7 @@ class TVEventHandler {
     );
     this.__nativeTVNavigationEventListener = this.__nativeTVNavigationEventEmitter.addListener(
       'onHWKeyEvent',
-      data => {
+      (data) => {
         if (callback) {
           callback(component, data);
         }
diff --git a/Libraries/Components/CheckBox/CheckBox.android.js b/Libraries/Components/CheckBox/CheckBox.android.js
index aed9cd9eb38..4a267a6a070 100644
--- a/Libraries/Components/CheckBox/CheckBox.android.js
+++ b/Libraries/Components/CheckBox/CheckBox.android.js
@@ -137,7 +137,7 @@ class CheckBox extends React.Component<Props> {
   _nativeRef: ?React.ElementRef<typeof AndroidCheckBoxNativeComponent> = null;
   _setNativeRef = setAndForwardRef({
     getForwardedRef: () => this.props.forwardedRef,
-    setLocalRef: ref => {
+    setLocalRef: (ref) => {
       this._nativeRef = ref;
     },
   });
diff --git a/Libraries/Components/DatePicker/DatePickerIOS.ios.js b/Libraries/Components/DatePicker/DatePickerIOS.ios.js
index 016c65bf5ab..599ddb7493b 100644
--- a/Libraries/Components/DatePicker/DatePickerIOS.ios.js
+++ b/Libraries/Components/DatePicker/DatePickerIOS.ios.js
@@ -146,7 +146,7 @@ class DatePickerIOS extends React.Component<Props> {
       <View style={props.style}>
         <RCTDatePickerNativeComponent
           testID={props.testID}
-          ref={picker => {
+          ref={(picker) => {
             this._picker = picker;
           }}
           style={styles.datePickerIOS}
diff --git a/Libraries/Components/DrawerAndroid/DrawerLayoutAndroid.android.js b/Libraries/Components/DrawerAndroid/DrawerLayoutAndroid.android.js
index 3758c669fd1..b0b17b90018 100644
--- a/Libraries/Components/DrawerAndroid/DrawerLayoutAndroid.android.js
+++ b/Libraries/Components/DrawerAndroid/DrawerLayoutAndroid.android.js
@@ -237,7 +237,7 @@ class DrawerLayoutAndroid extends React.Component<Props, State> {
     );
   }
 
-  _onDrawerSlide = event => {
+  _onDrawerSlide = (event) => {
     if (this.props.onDrawerSlide) {
       this.props.onDrawerSlide(event);
     }
@@ -258,7 +258,7 @@ class DrawerLayoutAndroid extends React.Component<Props, State> {
     }
   };
 
-  _onDrawerStateChanged = event => {
+  _onDrawerStateChanged = (event) => {
     if (this.props.onDrawerStateChanged) {
       this.props.onDrawerStateChanged(
         DRAWER_STATES[event.nativeEvent.drawerState],
diff --git a/Libraries/Components/Keyboard/Keyboard.js b/Libraries/Components/Keyboard/Keyboard.js
index c10fe53dad5..1f8e674529b 100644
--- a/Libraries/Components/Keyboard/Keyboard.js
+++ b/Libraries/Components/Keyboard/Keyboard.js
@@ -179,7 +179,7 @@ const Keyboard = {
 
 // Throw away the dummy object and reassign it to original module
 KeyboardEventEmitter.dismiss = dismissKeyboard;
-KeyboardEventEmitter.scheduleLayoutAnimation = function(event: KeyboardEvent) {
+KeyboardEventEmitter.scheduleLayoutAnimation = function (event: KeyboardEvent) {
   const {duration, easing} = event;
   if (duration != null && duration !== 0) {
     LayoutAnimation.configureNext({
diff --git a/Libraries/Components/Keyboard/KeyboardAvoidingView.js b/Libraries/Components/Keyboard/KeyboardAvoidingView.js
index 7c794ea5e8d..b9c2aee178a 100644
--- a/Libraries/Components/Keyboard/KeyboardAvoidingView.js
+++ b/Libraries/Components/Keyboard/KeyboardAvoidingView.js
@@ -138,7 +138,7 @@ class KeyboardAvoidingView extends React.Component<Props, State> {
   }
 
   componentWillUnmount(): void {
-    this._subscriptions.forEach(subscription => {
+    this._subscriptions.forEach((subscription) => {
       subscription.remove();
     });
   }
@@ -170,10 +170,7 @@ class KeyboardAvoidingView extends React.Component<Props, State> {
         return (
           <View
             ref={this.viewRef}
-            style={StyleSheet.compose(
-              style,
-              heightStyle,
-            )}
+            style={StyleSheet.compose(style, heightStyle)}
             onLayout={this._onLayout}
             {...props}>
             {children}
@@ -188,12 +185,9 @@ class KeyboardAvoidingView extends React.Component<Props, State> {
             onLayout={this._onLayout}
             {...props}>
             <View
-              style={StyleSheet.compose(
-                contentContainerStyle,
-                {
-                  bottom: bottomHeight,
-                },
-              )}>
+              style={StyleSheet.compose(contentContainerStyle, {
+                bottom: bottomHeight,
+              })}>
               {children}
             </View>
           </View>
@@ -203,10 +197,7 @@ class KeyboardAvoidingView extends React.Component<Props, State> {
         return (
           <View
             ref={this.viewRef}
-            style={StyleSheet.compose(
-              style,
-              {paddingBottom: bottomHeight},
-            )}
+            style={StyleSheet.compose(style, {paddingBottom: bottomHeight})}
             onLayout={this._onLayout}
             {...props}>
             {children}
diff --git a/Libraries/Components/Keyboard/__tests__/Keyboard-test.js b/Libraries/Components/Keyboard/__tests__/Keyboard-test.js
index 181eb14b77b..9c934092ad8 100644
--- a/Libraries/Components/Keyboard/__tests__/Keyboard-test.js
+++ b/Libraries/Components/Keyboard/__tests__/Keyboard-test.js
@@ -67,7 +67,7 @@ describe('Keyboard', () => {
     });
 
     describe('animation update type', () => {
-      const assertAnimationUpdateType = type =>
+      const assertAnimationUpdateType = (type) =>
         expect(LayoutAnimation.configureNext).toHaveBeenCalledWith(
           expect.objectContaining({
             duration: expect.anything(),
diff --git a/Libraries/Components/Picker/PickerAndroid.android.js b/Libraries/Components/Picker/PickerAndroid.android.js
index a47d29bd5ec..6d0be920d5a 100644
--- a/Libraries/Components/Picker/PickerAndroid.android.js
+++ b/Libraries/Components/Picker/PickerAndroid.android.js
@@ -85,7 +85,7 @@ function PickerAndroid(props: Props): React.Node {
       if (onValueChange != null) {
         if (position >= 0) {
           const children = React.Children.toArray(props.children).filter(
-            item => item != null,
+            (item) => item != null,
           );
           const value = children[position].props.value;
           if (props.selectedValue !== value) {
@@ -121,10 +121,7 @@ function PickerAndroid(props: Props): React.Node {
     prompt: props.prompt,
     ref: pickerRef,
     selected,
-    style: StyleSheet.compose(
-      styles.pickerAndroid,
-      props.style,
-    ),
+    style: StyleSheet.compose(styles.pickerAndroid, props.style),
     backgroundColor: props.backgroundColor,
     testID: props.testID,
   };
diff --git a/Libraries/Components/Picker/PickerIOS.ios.js b/Libraries/Components/Picker/PickerIOS.ios.js
index c2a5f2946fd..bc465d5b775 100644
--- a/Libraries/Components/Picker/PickerIOS.ios.js
+++ b/Libraries/Components/Picker/PickerIOS.ios.js
@@ -83,8 +83,8 @@ class PickerIOS extends React.Component<Props, State> {
     let selectedIndex = 0;
     const items = [];
     React.Children.toArray(props.children)
-      .filter(child => child !== null)
-      .forEach(function(child, index) {
+      .filter((child) => child !== null)
+      .forEach(function (child, index) {
         if (child.props.value === props.selectedValue) {
           selectedIndex = index;
         }
@@ -106,7 +106,7 @@ class PickerIOS extends React.Component<Props, State> {
     return (
       <View style={this.props.style}>
         <RCTPickerNativeComponent
-          ref={picker => {
+          ref={(picker) => {
             this._picker = picker;
           }}
           testID={this.props.testID}
@@ -136,7 +136,7 @@ class PickerIOS extends React.Component<Props, State> {
     }
   }
 
-  _onChange = event => {
+  _onChange = (event) => {
     if (this.props.onChange) {
       this.props.onChange(event);
     }
diff --git a/Libraries/Components/ScrollResponder.js b/Libraries/Components/ScrollResponder.js
index a520d17d287..7138c748884 100644
--- a/Libraries/Components/ScrollResponder.js
+++ b/Libraries/Components/ScrollResponder.js
@@ -123,7 +123,7 @@ const ScrollResponderMixin = {
   _subscriptionKeyboardWillHide: (null: ?EmitterSubscription),
   _subscriptionKeyboardDidShow: (null: ?EmitterSubscription),
   _subscriptionKeyboardDidHide: (null: ?EmitterSubscription),
-  scrollResponderMixinGetInitialState: function(): State {
+  scrollResponderMixinGetInitialState: function (): State {
     return {
       isTouching: false,
       lastMomentumScrollBeginTime: 0,
@@ -142,7 +142,7 @@ const ScrollResponderMixin = {
   /**
    * Invoke this from an `onScroll` event.
    */
-  scrollResponderHandleScrollShouldSetResponder: function(): boolean {
+  scrollResponderHandleScrollShouldSetResponder: function (): boolean {
     // Allow any event touch pass through if the default pan responder is disabled
     if (this.props.disableScrollViewPanResponder === true) {
       return false;
@@ -175,7 +175,7 @@ const ScrollResponderMixin = {
    *   true.
    *
    */
-  scrollResponderHandleStartShouldSetResponder: function(
+  scrollResponderHandleStartShouldSetResponder: function (
     e: PressEvent,
   ): boolean {
     // Allow any event touch pass through if the default pan responder is disabled
@@ -206,7 +206,7 @@ const ScrollResponderMixin = {
    *
    * Invoke this from an `onStartShouldSetResponderCapture` event.
    */
-  scrollResponderHandleStartShouldSetResponderCapture: function(
+  scrollResponderHandleStartShouldSetResponderCapture: function (
     e: PressEvent,
   ): boolean {
     // The scroll view should receive taps instead of its descendants if:
@@ -261,7 +261,7 @@ const ScrollResponderMixin = {
    * altogether. To improve this, find a way to disable the `UIScrollView` after
    * a touch has already started.
    */
-  scrollResponderHandleResponderReject: function() {},
+  scrollResponderHandleResponderReject: function () {},
 
   /**
    * We will allow the scroll view to give up its lock iff it acquired the lock
@@ -278,7 +278,7 @@ const ScrollResponderMixin = {
    *   navigation of a swipe gesture higher in the view hierarchy, should be
    *   rejected.
    */
-  scrollResponderHandleTerminationRequest: function(): boolean {
+  scrollResponderHandleTerminationRequest: function (): boolean {
     return !this.state.observedScrollSinceBecomingResponder;
   },
 
@@ -287,7 +287,7 @@ const ScrollResponderMixin = {
    *
    * @param {PressEvent} e Event.
    */
-  scrollResponderHandleTouchEnd: function(e: PressEvent) {
+  scrollResponderHandleTouchEnd: function (e: PressEvent) {
     const nativeEvent = e.nativeEvent;
     this.state.isTouching = nativeEvent.touches.length !== 0;
     this.props.onTouchEnd && this.props.onTouchEnd(e);
@@ -298,7 +298,7 @@ const ScrollResponderMixin = {
    *
    * @param {PressEvent} e Event.
    */
-  scrollResponderHandleTouchCancel: function(e: PressEvent) {
+  scrollResponderHandleTouchCancel: function (e: PressEvent) {
     this.state.isTouching = false;
     this.props.onTouchCancel && this.props.onTouchCancel(e);
   },
@@ -306,7 +306,7 @@ const ScrollResponderMixin = {
   /**
    * Invoke this from an `onResponderRelease` event.
    */
-  scrollResponderHandleResponderRelease: function(e: PressEvent) {
+  scrollResponderHandleResponderRelease: function (e: PressEvent) {
     this.props.onResponderRelease && this.props.onResponderRelease(e);
 
     if (typeof e.target === 'number') {
@@ -336,7 +336,7 @@ const ScrollResponderMixin = {
     }
   },
 
-  scrollResponderHandleScroll: function(e: ScrollEvent) {
+  scrollResponderHandleScroll: function (e: ScrollEvent) {
     (this: any).state.observedScrollSinceBecomingResponder = true;
     (this: any).props.onScroll && (this: any).props.onScroll(e);
   },
@@ -344,7 +344,7 @@ const ScrollResponderMixin = {
   /**
    * Invoke this from an `onResponderGrant` event.
    */
-  scrollResponderHandleResponderGrant: function(e: ScrollEvent) {
+  scrollResponderHandleResponderGrant: function (e: ScrollEvent) {
     this.state.observedScrollSinceBecomingResponder = false;
     this.props.onResponderGrant && this.props.onResponderGrant(e);
     this.state.becameResponderWhileAnimating = this.scrollResponderIsAnimating();
@@ -357,7 +357,7 @@ const ScrollResponderMixin = {
    *
    * Invoke this from an `onScrollBeginDrag` event.
    */
-  scrollResponderHandleScrollBeginDrag: function(e: ScrollEvent) {
+  scrollResponderHandleScrollBeginDrag: function (e: ScrollEvent) {
     FrameRateLogger.beginScroll(); // TODO: track all scrolls after implementing onScrollEndAnimation
     this.props.onScrollBeginDrag && this.props.onScrollBeginDrag(e);
   },
@@ -365,7 +365,7 @@ const ScrollResponderMixin = {
   /**
    * Invoke this from an `onScrollEndDrag` event.
    */
-  scrollResponderHandleScrollEndDrag: function(e: ScrollEvent) {
+  scrollResponderHandleScrollEndDrag: function (e: ScrollEvent) {
     const {velocity} = e.nativeEvent;
     // - If we are animating, then this is a "drag" that is stopping the scrollview and momentum end
     //   will fire.
@@ -384,7 +384,7 @@ const ScrollResponderMixin = {
   /**
    * Invoke this from an `onMomentumScrollBegin` event.
    */
-  scrollResponderHandleMomentumScrollBegin: function(e: ScrollEvent) {
+  scrollResponderHandleMomentumScrollBegin: function (e: ScrollEvent) {
     this.state.lastMomentumScrollBeginTime = performanceNow();
     this.props.onMomentumScrollBegin && this.props.onMomentumScrollBegin(e);
   },
@@ -392,7 +392,7 @@ const ScrollResponderMixin = {
   /**
    * Invoke this from an `onMomentumScrollEnd` event.
    */
-  scrollResponderHandleMomentumScrollEnd: function(e: ScrollEvent) {
+  scrollResponderHandleMomentumScrollEnd: function (e: ScrollEvent) {
     FrameRateLogger.endScroll();
     this.state.lastMomentumScrollEndTime = performanceNow();
     this.props.onMomentumScrollEnd && this.props.onMomentumScrollEnd(e);
@@ -409,7 +409,7 @@ const ScrollResponderMixin = {
    *
    * @param {PressEvent} e Touch Start event.
    */
-  scrollResponderHandleTouchStart: function(e: PressEvent) {
+  scrollResponderHandleTouchStart: function (e: PressEvent) {
     this.state.isTouching = true;
     this.props.onTouchStart && this.props.onTouchStart(e);
   },
@@ -425,7 +425,7 @@ const ScrollResponderMixin = {
    *
    * @param {PressEvent} e Touch Start event.
    */
-  scrollResponderHandleTouchMove: function(e: PressEvent) {
+  scrollResponderHandleTouchMove: function (e: PressEvent) {
     this.props.onTouchMove && this.props.onTouchMove(e);
   },
 
@@ -434,7 +434,7 @@ const ScrollResponderMixin = {
    * view is currently animating. This is particularly useful to know when
    * a touch has just started or ended.
    */
-  scrollResponderIsAnimating: function(): boolean {
+  scrollResponderIsAnimating: function (): boolean {
     const now = performanceNow();
     const timeSinceLastMomentumScrollEnd =
       now - this.state.lastMomentumScrollEndTime;
@@ -450,7 +450,7 @@ const ScrollResponderMixin = {
    * Components can pass what node to use by defining a `getScrollableNode`
    * function otherwise `this` is used.
    */
-  scrollResponderGetScrollableNode: function(): ?number {
+  scrollResponderGetScrollableNode: function (): ?number {
     return this.getScrollableNode
       ? this.getScrollableNode()
       : ReactNative.findNodeHandle(this);
@@ -467,7 +467,7 @@ const ScrollResponderMixin = {
    * the function also accepts separate arguments as as alternative to the options object.
    * This is deprecated due to ambiguity (y before x), and SHOULD NOT BE USED.
    */
-  scrollResponderScrollTo: function(
+  scrollResponderScrollTo: function (
     x?:
       | number
       | {
@@ -507,7 +507,7 @@ const ScrollResponderMixin = {
    *
    * `scrollResponderScrollToEnd({animated: true})`
    */
-  scrollResponderScrollToEnd: function(options?: {animated?: boolean, ...}) {
+  scrollResponderScrollToEnd: function (options?: {animated?: boolean, ...}) {
     // Default to true
     const animated = (options && options.animated) !== false;
 
@@ -530,7 +530,7 @@ const ScrollResponderMixin = {
    *
    * @platform ios
    */
-  scrollResponderZoomTo: function(
+  scrollResponderZoomTo: function (
     rect: {|
       x: number,
       y: number,
@@ -565,7 +565,7 @@ const ScrollResponderMixin = {
   /**
    * Displays the scroll indicators momentarily.
    */
-  scrollResponderFlashScrollIndicators: function() {
+  scrollResponderFlashScrollIndicators: function () {
     const that: React.ElementRef<ScrollView> = (this: any);
     invariant(
       that.getNativeScrollRef != null,
@@ -588,7 +588,7 @@ const ScrollResponderMixin = {
    * @param {bool} preventNegativeScrolling Whether to allow pulling the content
    *        down to make it meet the keyboard's top. Default is false.
    */
-  scrollResponderScrollNativeHandleToKeyboard: function<T>(
+  scrollResponderScrollNativeHandleToKeyboard: function <T>(
     nodeHandle: number | React.ElementRef<HostComponent<T>>,
     additionalOffset?: number,
     preventNegativeScrollOffset?: boolean,
@@ -628,7 +628,7 @@ const ScrollResponderMixin = {
    * @param {number} width Width of the text input.
    * @param {number} height Height of the text input.
    */
-  scrollResponderInputMeasureAndScrollToKeyboard: function(
+  scrollResponderInputMeasureAndScrollToKeyboard: function (
     left: number,
     top: number,
     width: number,
@@ -654,7 +654,7 @@ const ScrollResponderMixin = {
     this.preventNegativeScrollOffset = false;
   },
 
-  scrollResponderTextInputFocusError: function(msg: string) {
+  scrollResponderTextInputFocusError: function (msg: string) {
     console.error('Error measuring text field: ', msg);
   },
 
@@ -664,7 +664,7 @@ const ScrollResponderMixin = {
    *
    * The `keyboardWillShow` is called before input focus.
    */
-  UNSAFE_componentWillMount: function() {
+  UNSAFE_componentWillMount: function () {
     const {keyboardShouldPersistTaps} = ((this: any).props: ScrollViewProps);
     if (typeof keyboardShouldPersistTaps === 'boolean') {
       console.warn(
@@ -698,7 +698,7 @@ const ScrollResponderMixin = {
     );
   },
 
-  componentWillUnmount: function() {
+  componentWillUnmount: function () {
     if (this._subscriptionKeyboardWillShow != null) {
       this._subscriptionKeyboardWillShow.remove();
     }
@@ -741,17 +741,17 @@ const ScrollResponderMixin = {
    * relevant to you. (For example, only if you receive these callbacks after
    * you had explicitly focused a node etc).
    */
-  scrollResponderKeyboardWillShow: function(e: KeyboardEvent) {
+  scrollResponderKeyboardWillShow: function (e: KeyboardEvent) {
     this.keyboardWillOpenTo = e;
     this.props.onKeyboardWillShow && this.props.onKeyboardWillShow(e);
   },
 
-  scrollResponderKeyboardWillHide: function(e: KeyboardEvent) {
+  scrollResponderKeyboardWillHide: function (e: KeyboardEvent) {
     this.keyboardWillOpenTo = null;
     this.props.onKeyboardWillHide && this.props.onKeyboardWillHide(e);
   },
 
-  scrollResponderKeyboardDidShow: function(e: KeyboardEvent) {
+  scrollResponderKeyboardDidShow: function (e: KeyboardEvent) {
     // TODO(7693961): The event for DidShow is not available on iOS yet.
     // Use the one from WillShow and do not assign.
     if (e) {
@@ -760,7 +760,7 @@ const ScrollResponderMixin = {
     this.props.onKeyboardDidShow && this.props.onKeyboardDidShow(e);
   },
 
-  scrollResponderKeyboardDidHide: function(e: KeyboardEvent) {
+  scrollResponderKeyboardDidHide: function (e: KeyboardEvent) {
     this.keyboardWillOpenTo = null;
     this.props.onKeyboardDidHide && this.props.onKeyboardDidHide(e);
   },
diff --git a/Libraries/Components/ScrollView/ScrollView.js b/Libraries/Components/ScrollView/ScrollView.js
index dd4a0994304..824ed1c2947 100644
--- a/Libraries/Components/ScrollView/ScrollView.js
+++ b/Libraries/Components/ScrollView/ScrollView.js
@@ -368,7 +368,7 @@ type VRProps = $ReadOnly<{|
 
 type StickyHeaderComponentType = React.AbstractComponent<
   ScrollViewStickyHeaderProps,
-  $ReadOnly<{setNextHeaderY: number => void, ...}>,
+  $ReadOnly<{setNextHeaderY: (number) => void, ...}>,
 >;
 
 export type Props = $ReadOnly<{|
@@ -691,8 +691,8 @@ class ScrollView extends React.Component<Props, State> {
      *    instance.
      */
     Object.keys(ScrollResponder.Mixin)
-      .filter(key => typeof ScrollResponder.Mixin[key] !== 'function')
-      .forEach(key => {
+      .filter((key) => typeof ScrollResponder.Mixin[key] !== 'function')
+      .forEach((key) => {
         // $FlowFixMe - dynamically adding properties to a class
         (this: any)[key] = ScrollResponder.Mixin[key];
       });
@@ -966,7 +966,7 @@ class ScrollView extends React.Component<Props, State> {
   _innerViewRef: ?React.ElementRef<typeof View> = null;
   _setInnerViewRef = setAndForwardRef({
     getForwardedRef: () => this.props.innerViewRef,
-    setLocalRef: ref => {
+    setLocalRef: (ref) => {
       this._innerViewRef = ref;
     },
   });
@@ -1004,7 +1004,7 @@ class ScrollView extends React.Component<Props, State> {
     if (__DEV__ && this.props.style !== undefined) {
       const style = flattenStyle(this.props.style);
       const childLayoutProps = ['alignItems', 'justifyContent'].filter(
-        prop => style && style[prop] !== undefined,
+        (prop) => style && style[prop] !== undefined,
       );
       invariant(
         childLayoutProps.length === 0,
@@ -1037,11 +1037,13 @@ class ScrollView extends React.Component<Props, State> {
           return (
             <StickyHeaderComponent
               key={key}
-              ref={ref => this._setStickyHeaderRef(key, ref)}
+              ref={(ref) => this._setStickyHeaderRef(key, ref)}
               nextHeaderLayoutY={this._headerLayoutYs.get(
                 this._getKeyForIndex(nextIndex, childArray),
               )}
-              onLayout={event => this._onStickyHeaderLayout(index, event, key)}
+              onLayout={(event) =>
+                this._onStickyHeaderLayout(index, event, key)
+              }
               scrollAnimatedValue={this._scrollAnimatedValue}
               inverted={this.props.invertStickyHeaders}
               scrollViewHeight={this.state.layoutHeight}>
diff --git a/Libraries/Components/ScrollView/ScrollViewStickyHeader.js b/Libraries/Components/ScrollView/ScrollViewStickyHeader.js
index 0bc51bbfaec..20665260706 100644
--- a/Libraries/Components/ScrollView/ScrollViewStickyHeader.js
+++ b/Libraries/Components/ScrollView/ScrollViewStickyHeader.js
@@ -52,7 +52,7 @@ class ScrollViewStickyHeader extends React.Component<Props, State> {
     this.setState({nextHeaderLayoutY: y});
   }
 
-  _onLayout = event => {
+  _onLayout = (event) => {
     this.setState({
       measured: true,
       layoutY: event.nativeEvent.layout.y,
diff --git a/Libraries/Components/Slider/Slider.js b/Libraries/Components/Slider/Slider.js
index 28c7ff5a723..1a5d23f049b 100644
--- a/Libraries/Components/Slider/Slider.js
+++ b/Libraries/Components/Slider/Slider.js
@@ -198,10 +198,7 @@ const Slider = (
   props: Props,
   forwardedRef?: ?React.Ref<typeof SliderNativeComponent>,
 ) => {
-  const style = StyleSheet.compose(
-    styles.slider,
-    props.style,
-  );
+  const style = StyleSheet.compose(styles.slider, props.style);
 
   const {
     disabled = false,
diff --git a/Libraries/Components/Sound/SoundManager.js b/Libraries/Components/Sound/SoundManager.js
index 943b4c5c535..790b3d9e0a2 100644
--- a/Libraries/Components/Sound/SoundManager.js
+++ b/Libraries/Components/Sound/SoundManager.js
@@ -12,7 +12,7 @@
 import NativeSoundManager from './NativeSoundManager';
 
 const SoundManager = {
-  playTouchSound: function(): void {
+  playTouchSound: function (): void {
     if (NativeSoundManager) {
       NativeSoundManager.playTouchSound();
     }
diff --git a/Libraries/Components/StatusBar/StatusBar.js b/Libraries/Components/StatusBar/StatusBar.js
index 81ab87e4d37..482149fb7be 100644
--- a/Libraries/Components/StatusBar/StatusBar.js
+++ b/Libraries/Components/StatusBar/StatusBar.js
@@ -467,9 +467,7 @@ class StatusBar extends React.Component<Props> {
         const processedColor = processColor(mergedProps.backgroundColor.value);
         if (processedColor == null) {
           console.warn(
-            `\`StatusBar._updatePropsStack\`: Color ${
-              mergedProps.backgroundColor.value
-            } parsed to null or undefined`,
+            `\`StatusBar._updatePropsStack\`: Color ${mergedProps.backgroundColor.value} parsed to null or undefined`,
           );
         } else {
           invariant(
diff --git a/Libraries/Components/TextInput/TextInput.js b/Libraries/Components/TextInput/TextInput.js
index d8addd288d4..55808218618 100644
--- a/Libraries/Components/TextInput/TextInput.js
+++ b/Libraries/Components/TextInput/TextInput.js
@@ -945,7 +945,7 @@ function InternalTextInput(props: Props): React.Node {
 
   const _setNativeRef = setAndForwardRef({
     getForwardedRef: () => props.forwardedRef,
-    setLocalRef: ref => {
+    setLocalRef: (ref) => {
       inputRef.current = ref;
 
       /*
diff --git a/Libraries/Components/TextInput/__tests__/TextInput-test.js b/Libraries/Components/TextInput/__tests__/TextInput-test.js
index 38a64dccb69..1835d4fe018 100644
--- a/Libraries/Components/TextInput/__tests__/TextInput-test.js
+++ b/Libraries/Components/TextInput/__tests__/TextInput-test.js
@@ -41,11 +41,11 @@ describe('TextInput tests', () => {
           <TextInput
             ref={inputRef}
             value={state.text}
-            onChangeText={text => {
+            onChangeText={(text) => {
               onChangeTextListener(text);
               setState({text});
             }}
-            onChange={event => {
+            onChange={(event) => {
               onChangeListener(event);
             }}
           />
@@ -86,7 +86,7 @@ describe('TextInput tests', () => {
     ReactTestRenderer.create(<TextInput ref={textInputRef} value="value1" />);
 
     expect(textInputRef.current.isFocused()).toBe(false);
-    ReactNative.findNodeHandle = jest.fn().mockImplementation(ref => {
+    ReactNative.findNodeHandle = jest.fn().mockImplementation((ref) => {
       if (ref == null) {
         return null;
       }
@@ -125,7 +125,7 @@ describe('TextInput tests', () => {
         <TextInput ref={textInputRe2} value="value2" />
       </>,
     );
-    ReactNative.findNodeHandle = jest.fn().mockImplementation(ref => {
+    ReactNative.findNodeHandle = jest.fn().mockImplementation((ref) => {
       if (
         ref === textInputRe1.current ||
         ref === textInputRe1.current.getNativeRef()
diff --git a/Libraries/Components/ToastAndroid/ToastAndroid.android.js b/Libraries/Components/ToastAndroid/ToastAndroid.android.js
index 6d95ae87795..8c8df1a551d 100644
--- a/Libraries/Components/ToastAndroid/ToastAndroid.android.js
+++ b/Libraries/Components/ToastAndroid/ToastAndroid.android.js
@@ -41,11 +41,11 @@ const ToastAndroid = {
   BOTTOM: (NativeToastAndroid.getConstants().BOTTOM: number),
   CENTER: (NativeToastAndroid.getConstants().CENTER: number),
 
-  show: function(message: string, duration: number): void {
+  show: function (message: string, duration: number): void {
     NativeToastAndroid.show(message, duration);
   },
 
-  showWithGravity: function(
+  showWithGravity: function (
     message: string,
     duration: number,
     gravity: number,
@@ -53,7 +53,7 @@ const ToastAndroid = {
     NativeToastAndroid.showWithGravity(message, duration, gravity);
   },
 
-  showWithGravityAndOffset: function(
+  showWithGravityAndOffset: function (
     message: string,
     duration: number,
     gravity: number,
diff --git a/Libraries/Components/ToastAndroid/ToastAndroid.ios.js b/Libraries/Components/ToastAndroid/ToastAndroid.ios.js
index d0528ff65dc..0bd42d7cfa8 100644
--- a/Libraries/Components/ToastAndroid/ToastAndroid.ios.js
+++ b/Libraries/Components/ToastAndroid/ToastAndroid.ios.js
@@ -13,11 +13,11 @@
 const warning = require('fbjs/lib/warning');
 
 const ToastAndroid = {
-  show: function(message: string, duration: number): void {
+  show: function (message: string, duration: number): void {
     warning(false, 'ToastAndroid is not supported on this platform.');
   },
 
-  showWithGravity: function(
+  showWithGravity: function (
     message: string,
     duration: number,
     gravity: number,
@@ -25,7 +25,7 @@ const ToastAndroid = {
     warning(false, 'ToastAndroid is not supported on this platform.');
   },
 
-  showWithGravityAndOffset: function(
+  showWithGravityAndOffset: function (
     message: string,
     duration: number,
     gravity: number,
diff --git a/Libraries/Components/Touchable/BoundingDimensions.js b/Libraries/Components/Touchable/BoundingDimensions.js
index b0a48d0eccd..6c76a774cc6 100644
--- a/Libraries/Components/Touchable/BoundingDimensions.js
+++ b/Libraries/Components/Touchable/BoundingDimensions.js
@@ -25,7 +25,7 @@ function BoundingDimensions(width, height) {
   this.height = height;
 }
 
-BoundingDimensions.prototype.destructor = function() {
+BoundingDimensions.prototype.destructor = function () {
   this.width = null;
   this.height = null;
 };
@@ -34,7 +34,7 @@ BoundingDimensions.prototype.destructor = function() {
  * @param {HTMLElement} element Element to return `BoundingDimensions` for.
  * @return {BoundingDimensions} Bounding dimensions of `element`.
  */
-BoundingDimensions.getPooledFromElement = function(element) {
+BoundingDimensions.getPooledFromElement = function (element) {
   return BoundingDimensions.getPooled(
     element.offsetWidth,
     element.offsetHeight,
diff --git a/Libraries/Components/Touchable/PooledClass.js b/Libraries/Components/Touchable/PooledClass.js
index 4aee28a81c5..c53e0e6e39d 100644
--- a/Libraries/Components/Touchable/PooledClass.js
+++ b/Libraries/Components/Touchable/PooledClass.js
@@ -19,7 +19,7 @@ const invariant = require('invariant');
  * the Class itself, not an instance. If any others are needed, simply add them
  * here, or in their own files.
  */
-const oneArgumentPooler = function(copyFieldsFrom) {
+const oneArgumentPooler = function (copyFieldsFrom) {
   const Klass = this;
   if (Klass.instancePool.length) {
     const instance = Klass.instancePool.pop();
@@ -30,7 +30,7 @@ const oneArgumentPooler = function(copyFieldsFrom) {
   }
 };
 
-const twoArgumentPooler = function(a1, a2) {
+const twoArgumentPooler = function (a1, a2) {
   const Klass = this;
   if (Klass.instancePool.length) {
     const instance = Klass.instancePool.pop();
@@ -41,7 +41,7 @@ const twoArgumentPooler = function(a1, a2) {
   }
 };
 
-const threeArgumentPooler = function(a1, a2, a3) {
+const threeArgumentPooler = function (a1, a2, a3) {
   const Klass = this;
   if (Klass.instancePool.length) {
     const instance = Klass.instancePool.pop();
@@ -52,7 +52,7 @@ const threeArgumentPooler = function(a1, a2, a3) {
   }
 };
 
-const fourArgumentPooler = function(a1, a2, a3, a4) {
+const fourArgumentPooler = function (a1, a2, a3, a4) {
   const Klass = this;
   if (Klass.instancePool.length) {
     const instance = Klass.instancePool.pop();
@@ -63,7 +63,7 @@ const fourArgumentPooler = function(a1, a2, a3, a4) {
   }
 };
 
-const standardReleaser = function(instance) {
+const standardReleaser = function (instance) {
   const Klass = this;
   invariant(
     instance instanceof Klass,
@@ -89,7 +89,7 @@ type Pooler = any;
  * @param {Function} CopyConstructor Constructor that can be used to reset.
  * @param {Function} pooler Customizable pooler.
  */
-const addPoolingTo = function<T>(
+const addPoolingTo = function <T>(
   CopyConstructor: Class<T>,
   pooler: Pooler,
 ): Class<T> & {
diff --git a/Libraries/Components/Touchable/Position.js b/Libraries/Components/Touchable/Position.js
index 37c9738dd4b..f786ff245ee 100644
--- a/Libraries/Components/Touchable/Position.js
+++ b/Libraries/Components/Touchable/Position.js
@@ -26,7 +26,7 @@ function Position(left, top) {
   this.top = top;
 }
 
-Position.prototype.destructor = function() {
+Position.prototype.destructor = function () {
   this.left = null;
   this.top = null;
 };
diff --git a/Libraries/Components/Touchable/Touchable.js b/Libraries/Components/Touchable/Touchable.js
index a55164413f4..b8ed9995d74 100644
--- a/Libraries/Components/Touchable/Touchable.js
+++ b/Libraries/Components/Touchable/Touchable.js
@@ -27,7 +27,7 @@ const normalizeColor = require('../../StyleSheet/normalizeColor');
 import type {EdgeInsetsProp} from '../../StyleSheet/EdgeInsetsPropType';
 import type {PressEvent} from '../../Types/CoreEventTypes';
 
-const extractSingleTouch = nativeEvent => {
+const extractSingleTouch = (nativeEvent) => {
   const touches = nativeEvent.touches;
   const changedTouches = nativeEvent.changedTouches;
   const hasTouches = touches && touches.length > 0;
@@ -367,13 +367,13 @@ const LONG_PRESS_ALLOWED_MOVEMENT = 10;
  * @lends Touchable.prototype
  */
 const TouchableMixin = {
-  componentDidMount: function() {
+  componentDidMount: function () {
     if (!Platform.isTV) {
       return;
     }
 
     this._tvEventHandler = new TVEventHandler();
-    this._tvEventHandler.enable(this, function(cmp, evt) {
+    this._tvEventHandler.enable(this, function (cmp, evt) {
       const myTag = ReactNative.findNodeHandle(cmp);
       evt.dispatchConfig = {};
       if (myTag === evt.tag) {
@@ -393,7 +393,7 @@ const TouchableMixin = {
   /**
    * Clear all timeouts on unmount
    */
-  componentWillUnmount: function() {
+  componentWillUnmount: function () {
     if (this._tvEventHandler) {
       this._tvEventHandler.disable();
       delete this._tvEventHandler;
@@ -410,7 +410,7 @@ const TouchableMixin = {
    * @return {object} State object to be placed inside of
    * `this.state.touchable`.
    */
-  touchableGetInitialState: function(): $TEMPORARY$object<{|
+  touchableGetInitialState: function (): $TEMPORARY$object<{|
     touchable: $TEMPORARY$object<{|responderID: null, touchState: void|}>,
   |}> {
     return {
@@ -422,21 +422,21 @@ const TouchableMixin = {
   /**
    * Must return true if embedded in a native platform scroll view.
    */
-  touchableHandleResponderTerminationRequest: function(): any {
+  touchableHandleResponderTerminationRequest: function (): any {
     return !this.props.rejectResponderTermination;
   },
 
   /**
    * Must return true to start the process of `Touchable`.
    */
-  touchableHandleStartShouldSetResponder: function(): any {
+  touchableHandleStartShouldSetResponder: function (): any {
     return !this.props.disabled;
   },
 
   /**
    * Return true to cancel press on long press.
    */
-  touchableLongPressCancelsPress: function(): boolean {
+  touchableLongPressCancelsPress: function (): boolean {
     return true;
   },
 
@@ -445,7 +445,7 @@ const TouchableMixin = {
    * @param {SyntheticEvent} e Synthetic event from event system.
    *
    */
-  touchableHandleResponderGrant: function(e: PressEvent) {
+  touchableHandleResponderGrant: function (e: PressEvent) {
     const dispatchID = e.currentTarget;
     // Since e is used in a callback invoked on another event loop
     // (as in setTimeout etc), we need to call e.persist() on the
@@ -486,7 +486,7 @@ const TouchableMixin = {
   /**
    * Place as callback for a DOM element's `onResponderRelease` event.
    */
-  touchableHandleResponderRelease: function(e: PressEvent) {
+  touchableHandleResponderRelease: function (e: PressEvent) {
     this.pressInLocation = null;
     this._receiveSignal(Signals.RESPONDER_RELEASE, e);
   },
@@ -494,7 +494,7 @@ const TouchableMixin = {
   /**
    * Place as callback for a DOM element's `onResponderTerminate` event.
    */
-  touchableHandleResponderTerminate: function(e: PressEvent) {
+  touchableHandleResponderTerminate: function (e: PressEvent) {
     this.pressInLocation = null;
     this._receiveSignal(Signals.RESPONDER_TERMINATED, e);
   },
@@ -502,7 +502,7 @@ const TouchableMixin = {
   /**
    * Place as callback for a DOM element's `onResponderMove` event.
    */
-  touchableHandleResponderMove: function(e: PressEvent) {
+  touchableHandleResponderMove: function (e: PressEvent) {
     // Measurement may not have returned yet.
     if (!this.state.touchable.positionOnActivate) {
       return;
@@ -587,7 +587,7 @@ const TouchableMixin = {
    * element that was blurred just prior to this. This can be overridden when
    * using `Touchable.Mixin.withoutDefaultFocusAndBlur`.
    */
-  touchableHandleFocus: function(e: Event) {
+  touchableHandleFocus: function (e: Event) {
     this.props.onFocus && this.props.onFocus(e);
   },
 
@@ -599,7 +599,7 @@ const TouchableMixin = {
    * This can be overridden when using
    * `Touchable.Mixin.withoutDefaultFocusAndBlur`.
    */
-  touchableHandleBlur: function(e: Event) {
+  touchableHandleBlur: function (e: Event) {
     this.props.onBlur && this.props.onBlur(e);
   },
 
@@ -679,7 +679,7 @@ const TouchableMixin = {
    * @sideeffects
    * @private
    */
-  _remeasureMetricsOnActivation: function() {
+  _remeasureMetricsOnActivation: function () {
     const responderID = this.state.touchable.responderID;
     if (responderID == null) {
       return;
@@ -692,7 +692,7 @@ const TouchableMixin = {
     }
   },
 
-  _handleQueryLayout: function(
+  _handleQueryLayout: function (
     l: number,
     t: number,
     w: number,
@@ -718,12 +718,12 @@ const TouchableMixin = {
     );
   },
 
-  _handleDelay: function(e: PressEvent) {
+  _handleDelay: function (e: PressEvent) {
     this.touchableDelayTimeout = null;
     this._receiveSignal(Signals.DELAY, e);
   },
 
-  _handleLongDelay: function(e: PressEvent) {
+  _handleLongDelay: function (e: PressEvent) {
     this.longPressDelayTimeout = null;
     const curState = this.state.touchable.touchState;
     if (
@@ -742,7 +742,7 @@ const TouchableMixin = {
    * @throws Error if invalid state transition or unrecognized signal.
    * @sideeffects
    */
-  _receiveSignal: function(signal: Signal, e: PressEvent) {
+  _receiveSignal: function (signal: Signal, e: PressEvent) {
     const responderID = this.state.touchable.responderID;
     const curState = this.state.touchable.touchState;
     const nextState = Transitions[curState] && Transitions[curState][signal];
@@ -781,19 +781,19 @@ const TouchableMixin = {
     }
   },
 
-  _cancelLongPressDelayTimeout: function() {
+  _cancelLongPressDelayTimeout: function () {
     this.longPressDelayTimeout && clearTimeout(this.longPressDelayTimeout);
     this.longPressDelayTimeout = null;
   },
 
-  _isHighlight: function(state: State): boolean {
+  _isHighlight: function (state: State): boolean {
     return (
       state === States.RESPONDER_ACTIVE_PRESS_IN ||
       state === States.RESPONDER_ACTIVE_LONG_PRESS_IN
     );
   },
 
-  _savePressInLocation: function(e: PressEvent) {
+  _savePressInLocation: function (e: PressEvent) {
     const touch = extractSingleTouch(e.nativeEvent);
     const pageX = touch && touch.pageX;
     const pageY = touch && touch.pageY;
@@ -802,7 +802,7 @@ const TouchableMixin = {
     this.pressInLocation = {pageX, pageY, locationX, locationY};
   },
 
-  _getDistanceBetweenPoints: function(
+  _getDistanceBetweenPoints: function (
     aX: number,
     aY: number,
     bX: number,
@@ -824,7 +824,7 @@ const TouchableMixin = {
    * @param {Event} e Native event.
    * @sideeffects
    */
-  _performSideEffectsForTransition: function(
+  _performSideEffectsForTransition: function (
     curState: State,
     nextState: State,
     signal: Signal,
@@ -885,12 +885,12 @@ const TouchableMixin = {
     this.touchableDelayTimeout = null;
   },
 
-  _startHighlight: function(e: PressEvent) {
+  _startHighlight: function (e: PressEvent) {
     this._savePressInLocation(e);
     this.touchableHandleActivePressIn && this.touchableHandleActivePressIn(e);
   },
 
-  _endHighlight: function(e: PressEvent) {
+  _endHighlight: function (e: PressEvent) {
     if (this.touchableHandleActivePressOut) {
       if (
         this.touchableGetPressOutDelayMS &&
diff --git a/Libraries/Components/Touchable/TouchableBounce.js b/Libraries/Components/Touchable/TouchableBounce.js
index c47129dd392..cc859fb2446 100644
--- a/Libraries/Components/Touchable/TouchableBounce.js
+++ b/Libraries/Components/Touchable/TouchableBounce.js
@@ -55,7 +55,7 @@ class TouchableBounce extends React.Component<Props, State> {
       delayPressOut: this.props.delayPressOut,
       pressRectOffset: this.props.pressRetentionOffset,
       android_disableSound: this.props.touchSoundDisabled,
-      onBlur: event => {
+      onBlur: (event) => {
         if (Platform.isTV) {
           this._bounceTo(1, 0.4, 0);
         }
@@ -63,7 +63,7 @@ class TouchableBounce extends React.Component<Props, State> {
           this.props.onBlur(event);
         }
       },
-      onFocus: event => {
+      onFocus: (event) => {
         if (Platform.isTV) {
           this._bounceTo(0.93, 0.1, 0);
         }
@@ -71,12 +71,12 @@ class TouchableBounce extends React.Component<Props, State> {
           this.props.onFocus(event);
         }
       },
-      onLongPress: event => {
+      onLongPress: (event) => {
         if (this.props.onLongPress != null) {
           this.props.onLongPress(event);
         }
       },
-      onPress: event => {
+      onPress: (event) => {
         const {onPressAnimationComplete, onPressWithCompletion} = this.props;
         const releaseBounciness = this.props.releaseBounciness ?? 10;
         const releaseVelocity = this.props.releaseVelocity ?? 10;
@@ -104,13 +104,13 @@ class TouchableBounce extends React.Component<Props, State> {
           this.props.onPress(event);
         }
       },
-      onPressIn: event => {
+      onPressIn: (event) => {
         this._bounceTo(0.93, 0.1, 0);
         if (this.props.onPressIn != null) {
           this.props.onPressIn(event);
         }
       },
-      onPressOut: event => {
+      onPressOut: (event) => {
         this._bounceTo(1, 0.4, 0);
         if (this.props.onPressOut != null) {
           this.props.onPressOut(event);
@@ -179,17 +179,17 @@ class TouchableBounce extends React.Component<Props, State> {
     if (Platform.isTV) {
       this._tvTouchable = new TVTouchable(this, {
         getDisabled: () => this.props.disabled === true,
-        onBlur: event => {
+        onBlur: (event) => {
           if (this.props.onBlur != null) {
             this.props.onBlur(event);
           }
         },
-        onFocus: event => {
+        onFocus: (event) => {
           if (this.props.onFocus != null) {
             this.props.onFocus(event);
           }
         },
-        onPress: event => {
+        onPress: (event) => {
           if (this.props.onPress != null) {
             this.props.onPress(event);
           }
diff --git a/Libraries/Components/Touchable/TouchableHighlight.js b/Libraries/Components/Touchable/TouchableHighlight.js
index c7db381c792..9f7d05e58c3 100644
--- a/Libraries/Components/Touchable/TouchableHighlight.js
+++ b/Libraries/Components/Touchable/TouchableHighlight.js
@@ -176,7 +176,7 @@ class TouchableHighlight extends React.Component<Props, State> {
       delayPressOut: this.props.delayPressOut,
       pressRectOffset: this.props.pressRetentionOffset,
       android_disableSound: this.props.touchSoundDisabled,
-      onBlur: event => {
+      onBlur: (event) => {
         if (Platform.isTV) {
           this._hideUnderlay();
         }
@@ -184,7 +184,7 @@ class TouchableHighlight extends React.Component<Props, State> {
           this.props.onBlur(event);
         }
       },
-      onFocus: event => {
+      onFocus: (event) => {
         if (Platform.isTV) {
           this._showUnderlay();
         }
@@ -192,12 +192,12 @@ class TouchableHighlight extends React.Component<Props, State> {
           this.props.onFocus(event);
         }
       },
-      onLongPress: event => {
+      onLongPress: (event) => {
         if (this.props.onLongPress != null) {
           this.props.onLongPress(event);
         }
       },
-      onPress: event => {
+      onPress: (event) => {
         if (this._hideTimeout != null) {
           clearTimeout(this._hideTimeout);
         }
@@ -211,7 +211,7 @@ class TouchableHighlight extends React.Component<Props, State> {
           this.props.onPress(event);
         }
       },
-      onPressIn: event => {
+      onPressIn: (event) => {
         if (this._hideTimeout != null) {
           clearTimeout(this._hideTimeout);
           this._hideTimeout = null;
@@ -221,7 +221,7 @@ class TouchableHighlight extends React.Component<Props, State> {
           this.props.onPressIn(event);
         }
       },
-      onPressOut: event => {
+      onPressOut: (event) => {
         if (this._hideTimeout == null) {
           this._hideUnderlay();
         }
@@ -341,17 +341,17 @@ class TouchableHighlight extends React.Component<Props, State> {
     if (Platform.isTV) {
       this._tvTouchable = new TVTouchable(this, {
         getDisabled: () => this.props.disabled === true,
-        onBlur: event => {
+        onBlur: (event) => {
           if (this.props.onBlur != null) {
             this.props.onBlur(event);
           }
         },
-        onFocus: event => {
+        onFocus: (event) => {
           if (this.props.onFocus != null) {
             this.props.onFocus(event);
           }
         },
-        onPress: event => {
+        onPress: (event) => {
           if (this.props.onPress != null) {
             this.props.onPress(event);
           }
diff --git a/Libraries/Components/Touchable/TouchableNativeFeedback.js b/Libraries/Components/Touchable/TouchableNativeFeedback.js
index ed03379c54d..39cfcefe6e9 100644
--- a/Libraries/Components/Touchable/TouchableNativeFeedback.js
+++ b/Libraries/Components/Touchable/TouchableNativeFeedback.js
@@ -182,7 +182,7 @@ class TouchableNativeFeedback extends React.Component<Props, State> {
       android_disableSound: this.props.touchSoundDisabled,
       onLongPress: this.props.onLongPress,
       onPress: this.props.onPress,
-      onPressIn: event => {
+      onPressIn: (event) => {
         if (Platform.OS === 'android') {
           this._dispatchPressedStateChange(true);
           this._dispatchHotspotUpdate(event);
@@ -191,12 +191,12 @@ class TouchableNativeFeedback extends React.Component<Props, State> {
           this.props.onPressIn(event);
         }
       },
-      onPressMove: event => {
+      onPressMove: (event) => {
         if (Platform.OS === 'android') {
           this._dispatchHotspotUpdate(event);
         }
       },
-      onPressOut: event => {
+      onPressOut: (event) => {
         if (Platform.OS === 'android') {
           this._dispatchPressedStateChange(false);
         }
@@ -303,17 +303,17 @@ class TouchableNativeFeedback extends React.Component<Props, State> {
     if (Platform.isTV) {
       this._tvTouchable = new TVTouchable(this, {
         getDisabled: () => this.props.disabled === true,
-        onBlur: event => {
+        onBlur: (event) => {
           if (this.props.onBlur != null) {
             this.props.onBlur(event);
           }
         },
-        onFocus: event => {
+        onFocus: (event) => {
           if (this.props.onFocus != null) {
             this.props.onFocus(event);
           }
         },
-        onPress: event => {
+        onPress: (event) => {
           if (this.props.onPress != null) {
             this.props.onPress(event);
           }
diff --git a/Libraries/Components/Touchable/TouchableOpacity.js b/Libraries/Components/Touchable/TouchableOpacity.js
index aa5239fddaf..2b58b5a98d6 100644
--- a/Libraries/Components/Touchable/TouchableOpacity.js
+++ b/Libraries/Components/Touchable/TouchableOpacity.js
@@ -148,7 +148,7 @@ class TouchableOpacity extends React.Component<Props, State> {
       delayPressIn: this.props.delayPressIn,
       delayPressOut: this.props.delayPressOut,
       pressRectOffset: this.props.pressRetentionOffset,
-      onBlur: event => {
+      onBlur: (event) => {
         if (Platform.isTV) {
           this._opacityInactive(250);
         }
@@ -156,7 +156,7 @@ class TouchableOpacity extends React.Component<Props, State> {
           this.props.onBlur(event);
         }
       },
-      onFocus: event => {
+      onFocus: (event) => {
         if (Platform.isTV) {
           this._opacityActive(150);
         }
@@ -166,7 +166,7 @@ class TouchableOpacity extends React.Component<Props, State> {
       },
       onLongPress: this.props.onLongPress,
       onPress: this.props.onPress,
-      onPressIn: event => {
+      onPressIn: (event) => {
         this._opacityActive(
           event.dispatchConfig.registrationName === 'onResponderGrant'
             ? 0
@@ -176,7 +176,7 @@ class TouchableOpacity extends React.Component<Props, State> {
           this.props.onPressIn(event);
         }
       },
-      onPressOut: event => {
+      onPressOut: (event) => {
         this._opacityInactive(250);
         if (this.props.onPressOut != null) {
           this.props.onPressOut(event);
@@ -261,17 +261,17 @@ class TouchableOpacity extends React.Component<Props, State> {
     if (Platform.isTV) {
       this._tvTouchable = new TVTouchable(this, {
         getDisabled: () => this.props.disabled === true,
-        onBlur: event => {
+        onBlur: (event) => {
           if (this.props.onBlur != null) {
             this.props.onBlur(event);
           }
         },
-        onFocus: event => {
+        onFocus: (event) => {
           if (this.props.onFocus != null) {
             this.props.onFocus(event);
           }
         },
-        onPress: event => {
+        onPress: (event) => {
           if (this.props.onPress != null) {
             this.props.onPress(event);
           }
diff --git a/Libraries/Components/Touchable/TouchableWithoutFeedback.js b/Libraries/Components/Touchable/TouchableWithoutFeedback.js
index 5ad8aa62e5f..c81b45b56b5 100755
--- a/Libraries/Components/Touchable/TouchableWithoutFeedback.js
+++ b/Libraries/Components/Touchable/TouchableWithoutFeedback.js
@@ -138,17 +138,17 @@ class TouchableWithoutFeedback extends React.Component<Props, State> {
     if (Platform.isTV) {
       this._tvTouchable = new TVTouchable(this, {
         getDisabled: () => this.props.disabled === true,
-        onBlur: event => {
+        onBlur: (event) => {
           if (this.props.onBlur != null) {
             this.props.onBlur(event);
           }
         },
-        onFocus: event => {
+        onFocus: (event) => {
           if (this.props.onFocus != null) {
             this.props.onFocus(event);
           }
         },
-        onPress: event => {
+        onPress: (event) => {
           if (this.props.onPress != null) {
             this.props.onPress(event);
           }
diff --git a/Libraries/Components/Touchable/ensurePositiveDelayProps.js b/Libraries/Components/Touchable/ensurePositiveDelayProps.js
index 69dad5539fa..e0be1ba06ca 100644
--- a/Libraries/Components/Touchable/ensurePositiveDelayProps.js
+++ b/Libraries/Components/Touchable/ensurePositiveDelayProps.js
@@ -12,7 +12,7 @@
 
 const invariant = require('invariant');
 
-const ensurePositiveDelayProps = function(props: any) {
+const ensurePositiveDelayProps = function (props: any) {
   invariant(
     !(
       props.delayPressIn < 0 ||
diff --git a/Libraries/Core/Devtools/__tests__/parseErrorStack-test.js b/Libraries/Core/Devtools/__tests__/parseErrorStack-test.js
index c361f7a9edc..8bef703ba4a 100644
--- a/Libraries/Core/Devtools/__tests__/parseErrorStack-test.js
+++ b/Libraries/Core/Devtools/__tests__/parseErrorStack-test.js
@@ -16,8 +16,8 @@ function getFakeError() {
   return new Error('Happy Cat');
 }
 
-describe('parseErrorStack', function() {
-  it('parses error stack', function() {
+describe('parseErrorStack', function () {
+  it('parses error stack', function () {
     const stack = parseErrorStack(getFakeError());
     expect(stack.length).toBeGreaterThan(0);
 
@@ -26,7 +26,7 @@ describe('parseErrorStack', function() {
     expect(firstFrame.file).toMatch(/parseErrorStack-test\.js$/);
   });
 
-  it('does not support framesToPop', function() {
+  it('does not support framesToPop', function () {
     function getWrappedError() {
       const error = getFakeError();
       error.framesToPop = 1;
@@ -37,7 +37,7 @@ describe('parseErrorStack', function() {
     expect(stack[0].methodName).toEqual('getFakeError');
   });
 
-  it('ignores bad inputs', function() {
+  it('ignores bad inputs', function () {
     expect(parseErrorStack({})).toEqual([]);
     expect(parseErrorStack(null)).toEqual([]);
   });
diff --git a/Libraries/Core/Devtools/parseErrorStack.js b/Libraries/Core/Devtools/parseErrorStack.js
index ec69f3f69cf..1da501776fb 100644
--- a/Libraries/Core/Devtools/parseErrorStack.js
+++ b/Libraries/Core/Devtools/parseErrorStack.js
@@ -57,7 +57,7 @@ function parseErrorStack(e: ExtendedError): Array<StackFrame> {
     ? e.stack
     : global.HermesInternal
     ? convertHermesStack(parseHermesStack(e.stack))
-    : stacktraceParser.parse(e.stack).map(frame => ({
+    : stacktraceParser.parse(e.stack).map((frame) => ({
         ...frame,
         column: frame.column != null ? frame.column - 1 : null,
       }));
diff --git a/Libraries/Core/ExceptionsManager.js b/Libraries/Core/ExceptionsManager.js
index fd6ce28ad6e..c227d7f582f 100644
--- a/Libraries/Core/ExceptionsManager.js
+++ b/Libraries/Core/ExceptionsManager.js
@@ -18,7 +18,7 @@ class SyntheticError extends Error {
   name: string = '';
 }
 
-type ExceptionDecorator = ExceptionData => ExceptionData;
+type ExceptionDecorator = (ExceptionData) => ExceptionData;
 
 let userExceptionDecorator: ?ExceptionDecorator;
 let inUserExceptionDecorator = false;
@@ -130,7 +130,7 @@ function reportException(
             throw new Error('The stack is null');
           }
         })
-        .catch(error => {
+        .catch((error) => {
           console.log('Unable to symbolicate stack trace: ' + error.message);
         });
     }
@@ -222,7 +222,7 @@ function reactConsoleErrorHandler() {
   } else {
     const stringifySafe = require('../Utilities/stringifySafe').default;
     const str = Array.prototype.map
-      .call(arguments, value =>
+      .call(arguments, (value) =>
         typeof value === 'string' ? value : stringifySafe(value),
       )
       .join(' ');
diff --git a/Libraries/Core/Timers/JSTimers.js b/Libraries/Core/Timers/JSTimers.js
index 4c154db519d..8b0b5b12182 100644
--- a/Libraries/Core/Timers/JSTimers.js
+++ b/Libraries/Core/Timers/JSTimers.js
@@ -132,7 +132,7 @@ function _callTimer(timerID: number, frameTime: number, didTimeout: ?boolean) {
       callback(performanceNow());
     } else if (type === 'requestIdleCallback') {
       callback({
-        timeRemaining: function() {
+        timeRemaining: function () {
           // TODO: Optimisation: allow running for longer than one frame if
           // there are no pending JS calls on the bridge from native. This
           // would require a way to check the bridge queue synchronously.
@@ -221,7 +221,11 @@ const JSTimers = {
    * @param {function} func Callback to be invoked after `duration` ms.
    * @param {number} duration Number of milliseconds.
    */
-  setTimeout: function(func: Function, duration: number, ...args: any): number {
+  setTimeout: function (
+    func: Function,
+    duration: number,
+    ...args: any
+  ): number {
     if (__DEV__ && IS_ANDROID && duration > MAX_TIMER_DURATION_MS) {
       console.warn(
         ANDROID_LONG_TIMER_MESSAGE +
@@ -243,7 +247,7 @@ const JSTimers = {
    * @param {function} func Callback to be invoked every `duration` ms.
    * @param {number} duration Number of milliseconds.
    */
-  setInterval: function(
+  setInterval: function (
     func: Function,
     duration: number,
     ...args: any
@@ -269,7 +273,7 @@ const JSTimers = {
    * @param {function} func Callback to be invoked before the end of the
    * current JavaScript execution loop.
    */
-  setImmediate: function(func: Function, ...args: any) {
+  setImmediate: function (func: Function, ...args: any) {
     const id = _allocateCallback(
       () => func.apply(undefined, args),
       'setImmediate',
@@ -281,7 +285,7 @@ const JSTimers = {
   /**
    * @param {function} func Callback to be invoked every frame.
    */
-  requestAnimationFrame: function(func: Function) {
+  requestAnimationFrame: function (func: Function) {
     const id = _allocateCallback(func, 'requestAnimationFrame');
     createTimer(id, 1, Date.now(), /* recurring */ false);
     return id;
@@ -292,7 +296,7 @@ const JSTimers = {
    * with time remaining in frame.
    * @param {?object} options
    */
-  requestIdleCallback: function(func: Function, options: ?Object) {
+  requestIdleCallback: function (func: Function, options: ?Object) {
     if (requestIdleCallbacks.length === 0) {
       setSendIdleEvents(true);
     }
@@ -300,7 +304,7 @@ const JSTimers = {
     const timeout = options && options.timeout;
     const id = _allocateCallback(
       timeout != null
-        ? deadline => {
+        ? (deadline) => {
             const timeoutId = requestIdleCallbackTimeouts[id];
             if (timeoutId) {
               JSTimers.clearTimeout(timeoutId);
@@ -330,7 +334,7 @@ const JSTimers = {
     return id;
   },
 
-  cancelIdleCallback: function(timerID: number) {
+  cancelIdleCallback: function (timerID: number) {
     _freeCallback(timerID);
     const index = requestIdleCallbacks.indexOf(timerID);
     if (index !== -1) {
@@ -348,15 +352,15 @@ const JSTimers = {
     }
   },
 
-  clearTimeout: function(timerID: number) {
+  clearTimeout: function (timerID: number) {
     _freeCallback(timerID);
   },
 
-  clearInterval: function(timerID: number) {
+  clearInterval: function (timerID: number) {
     _freeCallback(timerID);
   },
 
-  clearImmediate: function(timerID: number) {
+  clearImmediate: function (timerID: number) {
     _freeCallback(timerID);
     const index = immediates.indexOf(timerID);
     if (index !== -1) {
@@ -364,7 +368,7 @@ const JSTimers = {
     }
   },
 
-  cancelAnimationFrame: function(timerID: number) {
+  cancelAnimationFrame: function (timerID: number) {
     _freeCallback(timerID);
   },
 
@@ -372,7 +376,7 @@ const JSTimers = {
    * This is called from the native side. We are passed an array of timerIDs,
    * and
    */
-  callTimers: function(timersToCall: Array<number>) {
+  callTimers: function (timersToCall: Array<number>) {
     invariant(
       timersToCall.length !== 0,
       'Cannot call `callTimers` with an empty list of IDs.',
@@ -390,7 +394,7 @@ const JSTimers = {
         // error one at a time
         for (let ii = 1; ii < errorCount; ii++) {
           JSTimers.setTimeout(
-            (error => {
+            ((error) => {
               throw error;
             }).bind(null, errors[ii]),
             0,
@@ -401,7 +405,7 @@ const JSTimers = {
     }
   },
 
-  callIdleCallbacks: function(frameTime: number) {
+  callIdleCallbacks: function (frameTime: number) {
     if (
       FRAME_DURATION - (performanceNow() - frameTime) <
       IDLE_CALLBACK_FRAME_DEADLINE
@@ -424,7 +428,7 @@ const JSTimers = {
     }
 
     if (errors) {
-      errors.forEach(error =>
+      errors.forEach((error) =>
         JSTimers.setTimeout(() => {
           throw error;
         }, 0),
@@ -440,7 +444,7 @@ const JSTimers = {
     errors = (null: ?Array<Error>);
     while (_callImmediatesPass()) {}
     if (errors) {
-      errors.forEach(error =>
+      errors.forEach((error) =>
         JSTimers.setTimeout(() => {
           throw error;
         }, 0),
diff --git a/Libraries/Core/Timers/__tests__/JSTimers-test.js b/Libraries/Core/Timers/__tests__/JSTimers-test.js
index baa281f03e6..155a392089f 100644
--- a/Libraries/Core/Timers/__tests__/JSTimers-test.js
+++ b/Libraries/Core/Timers/__tests__/JSTimers-test.js
@@ -29,33 +29,33 @@ jest
 
 const JSTimers = require('../JSTimers');
 
-describe('JSTimers', function() {
-  const firstArgumentOfTheLastCallTo = function(func) {
+describe('JSTimers', function () {
+  const firstArgumentOfTheLastCallTo = function (func) {
     return func.mock.calls[func.mock.calls.length - 1][0];
   };
 
-  beforeEach(function() {
+  beforeEach(function () {
     global.setTimeout = JSTimers.setTimeout;
   });
 
-  it('should call function with setTimeout', function() {
+  it('should call function with setTimeout', function () {
     let didCall = false;
-    const id = JSTimers.setTimeout(function() {
+    const id = JSTimers.setTimeout(function () {
       didCall = true;
     });
     JSTimers.callTimers([id]);
     expect(didCall).toBe(true);
   });
 
-  it('should call nested setTimeout when cleared', function() {
+  it('should call nested setTimeout when cleared', function () {
     let id1, id2, id3;
     let callCount = 0;
 
-    id1 = JSTimers.setTimeout(function() {
+    id1 = JSTimers.setTimeout(function () {
       JSTimers.clearTimeout(id1);
-      id2 = JSTimers.setTimeout(function() {
+      id2 = JSTimers.setTimeout(function () {
         JSTimers.clearTimeout(id2);
-        id3 = JSTimers.setTimeout(function() {
+        id3 = JSTimers.setTimeout(function () {
           callCount += 1;
         });
       });
@@ -67,15 +67,15 @@ describe('JSTimers', function() {
     expect(callCount).toBe(1);
   });
 
-  it('should call nested setImmediate when cleared', function() {
+  it('should call nested setImmediate when cleared', function () {
     let id1, id2, id3;
     let callCount = 0;
 
-    id1 = JSTimers.setImmediate(function() {
+    id1 = JSTimers.setImmediate(function () {
       JSTimers.clearImmediate(id1);
-      id2 = JSTimers.setImmediate(function() {
+      id2 = JSTimers.setImmediate(function () {
         JSTimers.clearImmediate(id2);
-        id3 = JSTimers.setImmediate(function() {
+        id3 = JSTimers.setImmediate(function () {
           callCount += 1;
         });
       });
@@ -87,15 +87,15 @@ describe('JSTimers', function() {
     expect(callCount).toBe(1);
   });
 
-  it('should call nested requestAnimationFrame when cleared', function() {
+  it('should call nested requestAnimationFrame when cleared', function () {
     let id1, id2, id3;
     let callCount = 0;
 
-    id1 = JSTimers.requestAnimationFrame(function() {
+    id1 = JSTimers.requestAnimationFrame(function () {
       JSTimers.cancelAnimationFrame(id1);
-      id2 = JSTimers.requestAnimationFrame(function() {
+      id2 = JSTimers.requestAnimationFrame(function () {
         JSTimers.cancelAnimationFrame(id2);
-        id3 = JSTimers.requestAnimationFrame(function() {
+        id3 = JSTimers.requestAnimationFrame(function () {
           callCount += 1;
         });
       });
@@ -107,15 +107,15 @@ describe('JSTimers', function() {
     expect(callCount).toBe(1);
   });
 
-  it('should call nested setInterval when cleared', function() {
+  it('should call nested setInterval when cleared', function () {
     let id1, id2, id3;
     let callCount = 0;
 
-    id1 = JSTimers.setInterval(function() {
+    id1 = JSTimers.setInterval(function () {
       JSTimers.clearInterval(id1);
-      id2 = JSTimers.setInterval(function() {
+      id2 = JSTimers.setInterval(function () {
         JSTimers.clearInterval(id2);
-        id3 = JSTimers.setInterval(function() {
+        id3 = JSTimers.setInterval(function () {
           callCount += 1;
         });
       });
@@ -127,21 +127,21 @@ describe('JSTimers', function() {
     expect(callCount).toBe(1);
   });
 
-  it('should call function with setInterval', function() {
+  it('should call function with setInterval', function () {
     const callback = jest.fn();
     const id = JSTimers.setInterval(callback);
     JSTimers.callTimers([id]);
     expect(callback).toBeCalledTimes(1);
   });
 
-  it('should call function with setImmediate', function() {
+  it('should call function with setImmediate', function () {
     const callback = jest.fn();
     JSTimers.setImmediate(callback);
     JSTimers.callImmediates();
     expect(callback).toBeCalledTimes(1);
   });
 
-  it('should not call function with clearImmediate', function() {
+  it('should not call function with clearImmediate', function () {
     const callback = jest.fn();
     const id = JSTimers.setImmediate(callback);
     JSTimers.clearImmediate(id);
@@ -149,14 +149,14 @@ describe('JSTimers', function() {
     expect(callback).not.toBeCalled();
   });
 
-  it('should call functions in the right order with setImmediate', function() {
+  it('should call functions in the right order with setImmediate', function () {
     let count = 0;
     let firstCalled = null;
     let secondCalled = null;
-    JSTimers.setImmediate(function() {
+    JSTimers.setImmediate(function () {
       firstCalled = count++;
     });
-    JSTimers.setImmediate(function() {
+    JSTimers.setImmediate(function () {
       secondCalled = count++;
     });
     JSTimers.callImmediates();
@@ -164,14 +164,14 @@ describe('JSTimers', function() {
     expect(secondCalled).toBe(1);
   });
 
-  it('should call functions in the right order with nested setImmediate', function() {
+  it('should call functions in the right order with nested setImmediate', function () {
     let count = 0;
     let firstCalled = null;
     let secondCalled = null;
     let thirdCalled = null;
-    JSTimers.setImmediate(function() {
+    JSTimers.setImmediate(function () {
       firstCalled = count++;
-      JSTimers.setImmediate(function() {
+      JSTimers.setImmediate(function () {
         thirdCalled = count++;
       });
       secondCalled = count++;
@@ -182,12 +182,12 @@ describe('JSTimers', function() {
     expect(thirdCalled).toBe(2);
   });
 
-  it('should call nested setImmediate', function() {
+  it('should call nested setImmediate', function () {
     let firstCalled = false;
     let secondCalled = false;
-    JSTimers.setImmediate(function() {
+    JSTimers.setImmediate(function () {
       firstCalled = true;
-      JSTimers.setImmediate(function() {
+      JSTimers.setImmediate(function () {
         secondCalled = true;
       });
     });
@@ -196,14 +196,14 @@ describe('JSTimers', function() {
     expect(secondCalled).toBe(true);
   });
 
-  it('should call function with requestAnimationFrame', function() {
+  it('should call function with requestAnimationFrame', function () {
     const callback = jest.fn();
     const id = JSTimers.requestAnimationFrame(callback);
     JSTimers.callTimers([id]);
     expect(callback).toBeCalledTimes(1);
   });
 
-  it("should not call function if we don't callTimers", function() {
+  it("should not call function if we don't callTimers", function () {
     const callback = jest.fn();
     JSTimers.setTimeout(callback, 10);
     expect(callback).not.toBeCalled();
@@ -213,7 +213,7 @@ describe('JSTimers', function() {
     expect(callback).not.toBeCalled();
   });
 
-  it('should call setInterval as many times as callTimers is called', function() {
+  it('should call setInterval as many times as callTimers is called', function () {
     const callback = jest.fn();
     const id = JSTimers.setInterval(callback, 10);
     JSTimers.callTimers([id]);
@@ -223,13 +223,13 @@ describe('JSTimers', function() {
     expect(callback).toBeCalledTimes(4);
   });
 
-  it("should only call the function who's id we pass in", function() {
+  it("should only call the function who's id we pass in", function () {
     let firstCalled = false;
     let secondCalled = false;
-    JSTimers.setTimeout(function() {
+    JSTimers.setTimeout(function () {
       firstCalled = true;
     });
-    const secondID = JSTimers.setTimeout(function() {
+    const secondID = JSTimers.setTimeout(function () {
       secondCalled = true;
     });
     JSTimers.callTimers([secondID]);
@@ -237,13 +237,13 @@ describe('JSTimers', function() {
     expect(secondCalled).toBe(true);
   });
 
-  it('should work with calling multiple timers', function() {
+  it('should work with calling multiple timers', function () {
     let firstCalled = false;
     let secondCalled = false;
-    const firstID = JSTimers.setTimeout(function() {
+    const firstID = JSTimers.setTimeout(function () {
       firstCalled = true;
     });
-    const secondID = JSTimers.setTimeout(function() {
+    const secondID = JSTimers.setTimeout(function () {
       secondCalled = true;
     });
     JSTimers.callTimers([firstID, secondID]);
@@ -251,27 +251,27 @@ describe('JSTimers', function() {
     expect(secondCalled).toBe(true);
   });
 
-  it('should still execute all callbacks even if one throws', function() {
-    const firstID = JSTimers.setTimeout(function() {
+  it('should still execute all callbacks even if one throws', function () {
+    const firstID = JSTimers.setTimeout(function () {
       throw new Error('error');
     }, 10);
     let secondCalled = false;
-    const secondID = JSTimers.setTimeout(function() {
+    const secondID = JSTimers.setTimeout(function () {
       secondCalled = true;
     }, 10);
     expect(JSTimers.callTimers.bind(null, [firstID, secondID])).toThrow();
     expect(secondCalled).toBe(true);
   });
 
-  it('should clear timers even if callback throws', function() {
-    const timerID = JSTimers.setTimeout(function() {
+  it('should clear timers even if callback throws', function () {
+    const timerID = JSTimers.setTimeout(function () {
       throw new Error('error');
     }, 10);
     expect(JSTimers.callTimers.bind(null, [timerID])).toThrow('error');
     JSTimers.callTimers.bind(null, [timerID]);
   });
 
-  it('should not warn if callback is called on cancelled timer', function() {
+  it('should not warn if callback is called on cancelled timer', function () {
     const callback = jest.fn();
     const timerID = JSTimers.setTimeout(callback, 10);
     JSTimers.clearTimeout(timerID);
@@ -280,12 +280,12 @@ describe('JSTimers', function() {
     expect(firstArgumentOfTheLastCallTo(warning)).toBe(true);
   });
 
-  it('should warn when callTimers is called with garbage timer id', function() {
+  it('should warn when callTimers is called with garbage timer id', function () {
     JSTimers.callTimers([1337]);
     expect(firstArgumentOfTheLastCallTo(warning)).toBe(false);
   });
 
-  it('should only call callback once for setTimeout', function() {
+  it('should only call callback once for setTimeout', function () {
     const callback = jest.fn();
     const timerID = JSTimers.setTimeout(callback, 10);
     // First time the timer fires, should call callback
@@ -297,7 +297,7 @@ describe('JSTimers', function() {
     expect(firstArgumentOfTheLastCallTo(warning)).toBe(true);
   });
 
-  it('should only call callback once for requestAnimationFrame', function() {
+  it('should only call callback once for requestAnimationFrame', function () {
     const callback = jest.fn();
     const timerID = JSTimers.requestAnimationFrame(callback, 10);
     // First time the timer fires, should call callback
@@ -309,11 +309,11 @@ describe('JSTimers', function() {
     expect(firstArgumentOfTheLastCallTo(warning)).toBe(true);
   });
 
-  it('should re-throw first exception', function() {
-    const timerID1 = JSTimers.setTimeout(function() {
+  it('should re-throw first exception', function () {
+    const timerID1 = JSTimers.setTimeout(function () {
       throw new Error('first error');
     });
-    const timerID2 = JSTimers.setTimeout(function() {
+    const timerID2 = JSTimers.setTimeout(function () {
       throw new Error('second error');
     });
     expect(JSTimers.callTimers.bind(null, [timerID1, timerID2])).toThrowError(
@@ -321,8 +321,8 @@ describe('JSTimers', function() {
     );
   });
 
-  it('should pass along errors thrown from setImmediate', function() {
-    JSTimers.setImmediate(function() {
+  it('should pass along errors thrown from setImmediate', function () {
+    JSTimers.setImmediate(function () {
       throw new Error('error within setImmediate');
     });
 
@@ -338,12 +338,12 @@ describe('JSTimers', function() {
     );
   });
 
-  it('should throw all errors from setImmediate', function() {
-    JSTimers.setImmediate(function() {
+  it('should throw all errors from setImmediate', function () {
+    JSTimers.setImmediate(function () {
       throw new Error('first error');
     });
 
-    JSTimers.setImmediate(function() {
+    JSTimers.setImmediate(function () {
       throw new Error('second error');
     });
 
@@ -363,8 +363,8 @@ describe('JSTimers', function() {
     );
   });
 
-  it('should pass along errors thrown from setTimeout', function() {
-    const timerID = JSTimers.setTimeout(function() {
+  it('should pass along errors thrown from setTimeout', function () {
+    const timerID = JSTimers.setTimeout(function () {
       throw new Error('error within setTimeout');
     });
 
@@ -373,11 +373,11 @@ describe('JSTimers', function() {
     );
   });
 
-  it('should throw all errors from setTimeout', function() {
-    const firstTimerID = JSTimers.setTimeout(function() {
+  it('should throw all errors from setTimeout', function () {
+    const firstTimerID = JSTimers.setTimeout(function () {
       throw new Error('first error');
     });
-    const secondTimerID = JSTimers.setTimeout(function() {
+    const secondTimerID = JSTimers.setTimeout(function () {
       throw new Error('second error');
     });
 
@@ -393,8 +393,8 @@ describe('JSTimers', function() {
     );
   });
 
-  it('should pass along errors thrown from setInterval', function() {
-    const timerID = JSTimers.setInterval(function() {
+  it('should pass along errors thrown from setInterval', function () {
+    const timerID = JSTimers.setInterval(function () {
       throw new Error('error within setInterval');
     });
     expect(JSTimers.callTimers.bind(null, [timerID])).toThrowError(
@@ -402,7 +402,7 @@ describe('JSTimers', function() {
     );
   });
 
-  it('should not call to native when clearing a null timer', function() {
+  it('should not call to native when clearing a null timer', function () {
     const timerID = JSTimers.setTimeout(() => {});
     JSTimers.clearTimeout(timerID);
     NativeTiming.deleteTimer = jest.fn();
diff --git a/Libraries/Core/__mocks__/ErrorUtils.js b/Libraries/Core/__mocks__/ErrorUtils.js
index 8505e23dc56..a1808e1b8c3 100644
--- a/Libraries/Core/__mocks__/ErrorUtils.js
+++ b/Libraries/Core/__mocks__/ErrorUtils.js
@@ -24,7 +24,7 @@ function reportError(error) {
 const ErrorUtils = {
   apply: jest.fn(execute),
   applyWithGuard: jest.fn(execute),
-  guard: jest.fn(callback => callback),
+  guard: jest.fn((callback) => callback),
   inGuard: jest.fn().mockReturnValue(true),
   reportError: jest.fn(reportError),
   setGlobalHandler: jest.fn(),
diff --git a/Libraries/Core/__tests__/ExceptionsManager-test.js b/Libraries/Core/__tests__/ExceptionsManager-test.js
index 71e3be3cb94..0ccaa4516a0 100644
--- a/Libraries/Core/__tests__/ExceptionsManager-test.js
+++ b/Libraries/Core/__tests__/ExceptionsManager-test.js
@@ -482,7 +482,7 @@ describe('ExceptionsManager', () => {
 
     test('modifying the exception data', () => {
       const error = new Error('Some error happened');
-      const decorator = jest.fn().mockImplementation(data => ({
+      const decorator = jest.fn().mockImplementation((data) => ({
         ...data,
         message: 'decorated: ' + data.message,
       }));
@@ -515,7 +515,7 @@ describe('ExceptionsManager', () => {
 
     test('clearing a decorator', () => {
       const error = new Error('Some error happened');
-      const decorator = jest.fn().mockImplementation(data => ({
+      const decorator = jest.fn().mockImplementation((data) => ({
         ...data,
         message: 'decorated: ' + data.message,
       }));
@@ -530,7 +530,7 @@ describe('ExceptionsManager', () => {
 
     test('prevents decorator recursion from error handler', () => {
       const error = new Error('Some error happened');
-      const decorator = jest.fn().mockImplementation(data => {
+      const decorator = jest.fn().mockImplementation((data) => {
         console.error('Logging an error within the decorator');
         return {
           ...data,
@@ -556,7 +556,7 @@ describe('ExceptionsManager', () => {
 
     test('prevents decorator recursion from console.error', () => {
       const error = new Error('Some error happened');
-      const decorator = jest.fn().mockImplementation(data => {
+      const decorator = jest.fn().mockImplementation((data) => {
         console.error('Logging an error within the decorator');
         return {
           ...data,
@@ -586,7 +586,7 @@ describe('ExceptionsManager', () => {
 
     test('can handle throwing decorators recursion when exception is thrown', () => {
       const error = new Error('Some error happened');
-      const decorator = jest.fn().mockImplementation(data => {
+      const decorator = jest.fn().mockImplementation((data) => {
         throw new Error('Throwing an error within the decorator');
       });
 
@@ -604,7 +604,7 @@ describe('ExceptionsManager', () => {
 
     test('can handle throwing decorators recursion when exception is logged', () => {
       const error = new Error('Some error happened');
-      const decorator = jest.fn().mockImplementation(data => {
+      const decorator = jest.fn().mockImplementation((data) => {
         throw new Error('Throwing an error within the decorator');
       });
 
diff --git a/Libraries/Core/__tests__/ReactNativeVersionCheck-test.js b/Libraries/Core/__tests__/ReactNativeVersionCheck-test.js
index dbb5920a7a2..f6107a6686b 100644
--- a/Libraries/Core/__tests__/ReactNativeVersionCheck-test.js
+++ b/Libraries/Core/__tests__/ReactNativeVersionCheck-test.js
@@ -45,7 +45,7 @@ function _defineCheckVersionTests() {
   beforeEach(() => {
     consoleOutput = '';
     console.error = jest.fn();
-    global.console = {error: jest.fn(error => (consoleOutput += error))};
+    global.console = {error: jest.fn((error) => (consoleOutput += error))};
     spyOnConsoleError = jest.spyOn(global.console, 'error');
   });
 
diff --git a/Libraries/Core/setUpAlert.js b/Libraries/Core/setUpAlert.js
index f4615ba8c2a..7d37fef72bb 100644
--- a/Libraries/Core/setUpAlert.js
+++ b/Libraries/Core/setUpAlert.js
@@ -15,7 +15,7 @@
  * You can use this module directly, or just require InitializeCore.
  */
 if (!global.alert) {
-  global.alert = function(text) {
+  global.alert = function (text) {
     // Require Alert on demand. Requiring it too early can lead to issues
     // with things like Platform not being fully initialized.
     require('../Alert/Alert').alert('Alert', '' + text);
diff --git a/Libraries/Core/setUpDeveloperTools.js b/Libraries/Core/setUpDeveloperTools.js
index 3ee84d87273..fca4aae1693 100644
--- a/Libraries/Core/setUpDeveloperTools.js
+++ b/Libraries/Core/setUpDeveloperTools.js
@@ -60,9 +60,9 @@ if (__DEV__) {
           'groupCollapsed',
           'groupEnd',
           'debug',
-        ].forEach(level => {
+        ].forEach((level) => {
           const originalFunction = console[level];
-          console[level] = function(...args) {
+          console[level] = function (...args) {
             HMRClient.log(level, args);
             originalFunction.apply(console, args);
           };
diff --git a/Libraries/Core/setUpTimers.js b/Libraries/Core/setUpTimers.js
index 89df16cc80c..bba4c31b366 100644
--- a/Libraries/Core/setUpTimers.js
+++ b/Libraries/Core/setUpTimers.js
@@ -18,7 +18,7 @@ if (!global.RN$Bridgeless) {
    * Set up timers.
    * You can use this module directly, or just require InitializeCore.
    */
-  const defineLazyTimer = name => {
+  const defineLazyTimer = (name) => {
     polyfillGlobal(name, () => require('./Timers/JSTimers')[name]);
   };
   defineLazyTimer('setTimeout');
diff --git a/Libraries/DeprecatedPropTypes/DeprecatedColorPropType.js b/Libraries/DeprecatedPropTypes/DeprecatedColorPropType.js
index caa6858a200..7265fa60aee 100644
--- a/Libraries/DeprecatedPropTypes/DeprecatedColorPropType.js
+++ b/Libraries/DeprecatedPropTypes/DeprecatedColorPropType.js
@@ -11,7 +11,7 @@
 
 const normalizeColor = require('../StyleSheet/normalizeColor');
 
-const colorPropType = function(
+const colorPropType = function (
   isRequired,
   props,
   propName,
diff --git a/Libraries/DeprecatedPropTypes/DeprecatedStyleSheetPropType.js b/Libraries/DeprecatedPropTypes/DeprecatedStyleSheetPropType.js
index f692187a678..0dd3454b5af 100644
--- a/Libraries/DeprecatedPropTypes/DeprecatedStyleSheetPropType.js
+++ b/Libraries/DeprecatedPropTypes/DeprecatedStyleSheetPropType.js
@@ -18,7 +18,7 @@ function DeprecatedStyleSheetPropType(shape: {
   ...,
 }): ReactPropsCheckType {
   const shapePropType = deprecatedCreateStrictShapeTypeChecker(shape);
-  return function(props, propName, componentName, location?, ...rest) {
+  return function (props, propName, componentName, location?, ...rest) {
     let newProps = props;
     if (props[propName]) {
       // Just make a dummy prop object with only the flattened style
diff --git a/Libraries/DeprecatedPropTypes/DeprecatedTransformPropTypes.js b/Libraries/DeprecatedPropTypes/DeprecatedTransformPropTypes.js
index daba0d83676..48c918a415f 100644
--- a/Libraries/DeprecatedPropTypes/DeprecatedTransformPropTypes.js
+++ b/Libraries/DeprecatedPropTypes/DeprecatedTransformPropTypes.js
@@ -14,7 +14,7 @@ const ReactPropTypes = require('prop-types');
 
 const deprecatedPropType = require('../Utilities/deprecatedPropType');
 
-const TransformMatrixPropType = function(
+const TransformMatrixPropType = function (
   props: Object,
   propName: string,
   componentName: string,
@@ -27,7 +27,7 @@ const TransformMatrixPropType = function(
   }
 };
 
-const DecomposedMatrixPropType = function(
+const DecomposedMatrixPropType = function (
   props: Object,
   propName: string,
   componentName: string,
diff --git a/Libraries/HeapCapture/HeapCapture.js b/Libraries/HeapCapture/HeapCapture.js
index 903343a05b0..ed4ac7f1958 100644
--- a/Libraries/HeapCapture/HeapCapture.js
+++ b/Libraries/HeapCapture/HeapCapture.js
@@ -13,7 +13,7 @@
 import NativeJSCHeapCapture from './NativeJSCHeapCapture';
 
 const HeapCapture = {
-  captureHeap: function(path: string) {
+  captureHeap: function (path: string) {
     let error = null;
     try {
       global.nativeCaptureHeap(path);
diff --git a/Libraries/Image/Image.android.js b/Libraries/Image/Image.android.js
index a445ebcebc5..6802dd08726 100644
--- a/Libraries/Image/Image.android.js
+++ b/Libraries/Image/Image.android.js
@@ -154,12 +154,12 @@ function getSize(
   failure?: (error: any) => void,
 ): any {
   return NativeImageLoaderAndroid.getSize(url)
-    .then(function(sizes) {
+    .then(function (sizes) {
       success(sizes.width, sizes.height);
     })
     .catch(
       failure ||
-        function() {
+        function () {
           console.warn('Failed to get size for image: ' + url);
         },
     );
@@ -178,12 +178,12 @@ function getSizeWithHeaders(
   failure?: (error: any) => void,
 ): any {
   return NativeImageLoaderAndroid.getSizeWithHeaders(url, headers)
-    .then(function(sizes) {
+    .then(function (sizes) {
       success(sizes.width, sizes.height);
     })
     .catch(
       failure ||
-        function() {
+        function () {
           console.warn('Failed to get size for image: ' + url);
         },
     );
@@ -289,7 +289,7 @@ let Image = (props: ImagePropsType, forwardedRef) => {
 
   return (
     <TextAncestor.Consumer>
-      {hasTextAncestor =>
+      {(hasTextAncestor) =>
         hasTextAncestor ? (
           <TextInlineImageNativeComponent {...nativeProps} />
         ) : (
diff --git a/Libraries/Image/Image.ios.js b/Libraries/Image/Image.ios.js
index 22b28309076..22593198265 100644
--- a/Libraries/Image/Image.ios.js
+++ b/Libraries/Image/Image.ios.js
@@ -34,7 +34,7 @@ function getSize(
     .then(([width, height]) => success(width, height))
     .catch(
       failure ||
-        function() {
+        function () {
           console.warn('Failed to get size for image ' + uri);
         },
     );
@@ -47,12 +47,12 @@ function getSizeWithHeaders(
   failure?: (error: any) => void,
 ): any {
   return NativeImageLoaderIOS.getSizeWithHeaders(uri, headers)
-    .then(function(sizes) {
+    .then(function (sizes) {
       success(sizes.width, sizes.height);
     })
     .catch(
       failure ||
-        function() {
+        function () {
           console.warn('Failed to get size for image: ' + uri);
         },
     );
diff --git a/Libraries/Image/ImageBackground.js b/Libraries/Image/ImageBackground.js
index b4b6223b846..68b85c6cb8d 100644
--- a/Libraries/Image/ImageBackground.js
+++ b/Libraries/Image/ImageBackground.js
@@ -50,7 +50,7 @@ class ImageBackground extends React.Component<$FlowFixMeProps> {
 
   _viewRef: ?React.ElementRef<typeof View> = null;
 
-  _captureRef = ref => {
+  _captureRef = (ref) => {
     this._viewRef = ref;
   };
 
diff --git a/Libraries/Image/ImagePickerIOS.js b/Libraries/Image/ImagePickerIOS.js
index a9127deaabf..da9cb014274 100644
--- a/Libraries/Image/ImagePickerIOS.js
+++ b/Libraries/Image/ImagePickerIOS.js
@@ -14,15 +14,15 @@ import NativeImagePickerIOS from './NativeImagePickerIOS';
 import invariant from 'invariant';
 
 const ImagePickerIOS = {
-  canRecordVideos: function(callback: (result: boolean) => void): void {
+  canRecordVideos: function (callback: (result: boolean) => void): void {
     invariant(NativeImagePickerIOS, 'ImagePickerIOS is not available');
     return NativeImagePickerIOS.canRecordVideos(callback);
   },
-  canUseCamera: function(callback: (result: boolean) => void): void {
+  canUseCamera: function (callback: (result: boolean) => void): void {
     invariant(NativeImagePickerIOS, 'ImagePickerIOS is not available');
     return NativeImagePickerIOS.canUseCamera(callback);
   },
-  openCameraDialog: function(
+  openCameraDialog: function (
     config: $ReadOnly<{|
       unmirrorFrontFacingCamera?: boolean,
       videoMode?: boolean,
@@ -51,7 +51,7 @@ const ImagePickerIOS = {
       cancelCallback,
     );
   },
-  openSelectDialog: function(
+  openSelectDialog: function (
     config: $ReadOnly<{|
       showImages?: boolean,
       showVideos?: boolean,
@@ -88,7 +88,7 @@ const ImagePickerIOS = {
    * It is safe to call this method for urlsthat aren't video URLs;
    * it will be a no-op.
    */
-  removePendingVideo: function(url: string): void {
+  removePendingVideo: function (url: string): void {
     invariant(NativeImagePickerIOS, 'ImagePickerIOS is not available');
     NativeImagePickerIOS.removePendingVideo(url);
   },
@@ -96,7 +96,7 @@ const ImagePickerIOS = {
    * WARNING: In most cases, removePendingVideo should be used instead because
    * clearAllPendingVideos could clear out pending videos made by other callers.
    */
-  clearAllPendingVideos: function(): void {
+  clearAllPendingVideos: function (): void {
     invariant(NativeImagePickerIOS, 'ImagePickerIOS is not available');
     NativeImagePickerIOS.clearAllPendingVideos();
   },
diff --git a/Libraries/Image/__tests__/resolveAssetSource-test.js b/Libraries/Image/__tests__/resolveAssetSource-test.js
index ee752bd7322..95261685024 100644
--- a/Libraries/Image/__tests__/resolveAssetSource-test.js
+++ b/Libraries/Image/__tests__/resolveAssetSource-test.js
@@ -298,7 +298,7 @@ describe('resolveAssetSource', () => {
     });
 
     it('uses bundled source, event when js is sideloaded', () => {
-      resolveAssetSource.setCustomSourceTransformer(resolver =>
+      resolveAssetSource.setCustomSourceTransformer((resolver) =>
         resolver.resourceIdentifierWithoutScale(),
       );
       expectResolvesAsset(
@@ -324,7 +324,7 @@ describe('resolveAssetSource', () => {
     });
 
     it('allows any customization', () => {
-      resolveAssetSource.setCustomSourceTransformer(resolver =>
+      resolveAssetSource.setCustomSourceTransformer((resolver) =>
         resolver.fromSource('TEST'),
       );
       expectResolvesAsset(
diff --git a/Libraries/Inspector/ElementProperties.js b/Libraries/Inspector/ElementProperties.js
index 48a7ff491b6..f5e51ce3643 100644
--- a/Libraries/Inspector/ElementProperties.js
+++ b/Libraries/Inspector/ElementProperties.js
@@ -35,7 +35,7 @@ type Props = $ReadOnly<{|
   },
   frame?: ?Object,
   selection?: ?number,
-  setSelection?: number => mixed,
+  setSelection?: (number) => mixed,
 |}>;
 
 class ElementProperties extends React.Component<Props> {
@@ -75,7 +75,7 @@ class ElementProperties extends React.Component<Props> {
                   <Text style={styles.breadItemText}>{hierarchyItem.name}</Text>
                 </TouchableHighlight>
               ),
-              i => (
+              (i) => (
                 <Text key={'sep-' + i} style={styles.breadSep}>
                   &#9656;
                 </Text>
diff --git a/Libraries/Inspector/Inspector.js b/Libraries/Inspector/Inspector.js
index 25993952658..8b59d580384 100644
--- a/Libraries/Inspector/Inspector.js
+++ b/Libraries/Inspector/Inspector.js
@@ -118,7 +118,7 @@ class Inspector extends React.Component<
 
   componentWillUnmount() {
     if (this._subs) {
-      this._subs.map(fn => fn());
+      this._subs.map((fn) => fn());
     }
     hook.off('react-devtools', this._attachToDevtools);
   }
@@ -149,7 +149,7 @@ class Inspector extends React.Component<
     }, 100);
   };
 
-  _onAgentShowNativeHighlight = node => {
+  _onAgentShowNativeHighlight = (node) => {
     clearTimeout(this._hideTimeoutID);
 
     node.measure((x, y, width, height, left, top) => {
@@ -242,7 +242,7 @@ class Inspector extends React.Component<
 
   setTouchTargeting(val: boolean) {
     Touchable.TOUCH_TARGET_DEBUG = val;
-    this.props.onRequestRerenderApp(inspectedView => {
+    this.props.onRequestRerenderApp((inspectedView) => {
       this.setState({inspectedView});
     });
   }
diff --git a/Libraries/Inspector/InspectorPanel.js b/Libraries/Inspector/InspectorPanel.js
index 9cf47a83770..b36046267a8 100644
--- a/Libraries/Inspector/InspectorPanel.js
+++ b/Libraries/Inspector/InspectorPanel.js
@@ -34,7 +34,7 @@ type Props = $ReadOnly<{|
   setNetworking: (val: boolean) => void,
   hierarchy?: ?Array<{|name: string|}>,
   selection?: ?number,
-  setSelection: number => mixed,
+  setSelection: (number) => mixed,
   inspected?: ?$ReadOnly<{|
     style?: ?ViewStyleProp,
     frame?: ?$ReadOnly<{|
diff --git a/Libraries/Inspector/NetworkOverlay.js b/Libraries/Inspector/NetworkOverlay.js
index 45e6bdadcbf..4e757185729 100644
--- a/Libraries/Inspector/NetworkOverlay.js
+++ b/Libraries/Inspector/NetworkOverlay.js
@@ -360,7 +360,7 @@ class NetworkOverlay extends React.Component<Props, State> {
 
   _renderItemDetail(id) {
     const requestItem = this.state.requests[id];
-    const details = Object.keys(requestItem).map(key => {
+    const details = Object.keys(requestItem).map((key) => {
       if (key === 'id') {
         return;
       }
@@ -387,7 +387,7 @@ class NetworkOverlay extends React.Component<Props, State> {
         </TouchableHighlight>
         <ScrollView
           style={styles.detailScrollView}
-          ref={scrollRef => (this._detailScrollView = scrollRef)}>
+          ref={(scrollRef) => (this._detailScrollView = scrollRef)}>
           {details}
         </ScrollView>
       </View>
diff --git a/Libraries/Inspector/StyleInspector.js b/Libraries/Inspector/StyleInspector.js
index 820224b3bc6..dea9f0d8ea0 100644
--- a/Libraries/Inspector/StyleInspector.js
+++ b/Libraries/Inspector/StyleInspector.js
@@ -24,7 +24,7 @@ class StyleInspector extends React.Component<$FlowFixMeProps> {
     return (
       <View style={styles.container}>
         <View>
-          {names.map(name => (
+          {names.map((name) => (
             <Text key={name} style={styles.attr}>
               {name}:
             </Text>
@@ -32,7 +32,7 @@ class StyleInspector extends React.Component<$FlowFixMeProps> {
         </View>
 
         <View>
-          {names.map(name => {
+          {names.map((name) => {
             const value = this.props.style[name];
             return (
               <Text key={name} style={styles.value}>
diff --git a/Libraries/Interaction/BridgeSpyStallHandler.js b/Libraries/Interaction/BridgeSpyStallHandler.js
index e90777d4152..83ab14f9242 100644
--- a/Libraries/Interaction/BridgeSpyStallHandler.js
+++ b/Libraries/Interaction/BridgeSpyStallHandler.js
@@ -16,9 +16,9 @@ const MessageQueue = require('../BatchedBridge/MessageQueue');
 const infoLog = require('../Utilities/infoLog');
 
 const BridgeSpyStallHandler = {
-  register: function() {
+  register: function () {
     let spyBuffer = [];
-    MessageQueue.spy(data => {
+    MessageQueue.spy((data) => {
       spyBuffer.push(data);
     });
     const TO_JS = 0;
@@ -26,13 +26,13 @@ const BridgeSpyStallHandler = {
       onStall: () => {
         infoLog(
           spyBuffer.length + ' bridge messages during stall: ',
-          spyBuffer.map(info => {
+          spyBuffer.map((info) => {
             let args = '<args>';
             try {
               args = JSON.stringify(info.args);
             } catch (e1) {
               if (Array.isArray(info.args)) {
-                args = info.args.map(arg => {
+                args = info.args.map((arg) => {
                   try {
                     return JSON.stringify(arg);
                   } catch (e2) {
diff --git a/Libraries/Interaction/FrameRateLogger.js b/Libraries/Interaction/FrameRateLogger.js
index 434e962b027..8417131b108 100644
--- a/Libraries/Interaction/FrameRateLogger.js
+++ b/Libraries/Interaction/FrameRateLogger.js
@@ -35,7 +35,7 @@ const FrameRateLogger = {
    * Enable `debug` to see local logs of what's going on. `reportStackTraces` will grab stack traces
    * during UI thread stalls and upload them if the native module supports it.
    */
-  setGlobalOptions: function(options: {
+  setGlobalOptions: function (options: {
     debug?: boolean,
     reportStackTraces?: boolean,
     ...
@@ -60,7 +60,7 @@ const FrameRateLogger = {
    * Must call `setContext` before any events can be properly tracked, which is done automatically
    * in `AppRegistry`, but navigation is also a common place to hook in.
    */
-  setContext: function(context: string) {
+  setContext: function (context: string) {
     NativeFrameRateLogger && NativeFrameRateLogger.setContext(context);
   },
 
diff --git a/Libraries/Interaction/InteractionManager.js b/Libraries/Interaction/InteractionManager.js
index 02912bbc3cf..48e5ede5e6c 100644
--- a/Libraries/Interaction/InteractionManager.js
+++ b/Libraries/Interaction/InteractionManager.js
@@ -94,7 +94,7 @@ const InteractionManager = {
     ...
   } {
     const tasks = [];
-    const promise = new Promise(resolve => {
+    const promise = new Promise((resolve) => {
       _scheduleUpdate();
       if (task) {
         tasks.push(task);
@@ -116,7 +116,7 @@ const InteractionManager = {
           );
         }
       },
-      cancel: function() {
+      cancel: function () {
         _taskQueue.cancelTasks(tasks);
       },
     };
@@ -189,8 +189,8 @@ function _processUpdate() {
   _nextUpdateHandle = 0;
 
   const interactionCount = _interactionSet.size;
-  _addInteractionSet.forEach(handle => _interactionSet.add(handle));
-  _deleteInteractionSet.forEach(handle => _interactionSet.delete(handle));
+  _addInteractionSet.forEach((handle) => _interactionSet.add(handle));
+  _deleteInteractionSet.forEach((handle) => _interactionSet.delete(handle));
   const nextInteractionCount = _interactionSet.size;
 
   if (interactionCount !== 0 && nextInteractionCount === 0) {
diff --git a/Libraries/Interaction/InteractionMixin.js b/Libraries/Interaction/InteractionMixin.js
index fcbd88f5a19..3d51aead5ba 100644
--- a/Libraries/Interaction/InteractionMixin.js
+++ b/Libraries/Interaction/InteractionMixin.js
@@ -19,7 +19,7 @@ import {type Handle} from './InteractionManager';
  * once per start, even if the component is unmounted.
  */
 const InteractionMixin = {
-  componentWillUnmount: function() {
+  componentWillUnmount: function () {
     while (this._interactionMixinHandles.length) {
       InteractionManager.clearInteractionHandle(
         this._interactionMixinHandles.pop(),
@@ -29,16 +29,16 @@ const InteractionMixin = {
 
   _interactionMixinHandles: ([]: Array<number>),
 
-  createInteractionHandle: function(): Handle {
+  createInteractionHandle: function (): Handle {
     const handle = InteractionManager.createInteractionHandle();
     this._interactionMixinHandles.push(handle);
     return handle;
   },
 
-  clearInteractionHandle: function(clearHandle: number): void {
+  clearInteractionHandle: function (clearHandle: number): void {
     InteractionManager.clearInteractionHandle(clearHandle);
     this._interactionMixinHandles = this._interactionMixinHandles.filter(
-      handle => handle !== clearHandle,
+      (handle) => handle !== clearHandle,
     );
   },
 
@@ -47,7 +47,7 @@ const InteractionMixin = {
    *
    * @param {function} callback
    */
-  runAfterInteractions: function(callback: Function): void {
+  runAfterInteractions: function (callback: Function): void {
     InteractionManager.runAfterInteractions(callback);
   },
 };
diff --git a/Libraries/Interaction/JSEventLoopWatchdog.js b/Libraries/Interaction/JSEventLoopWatchdog.js
index c2787f188fd..9bb800d8c39 100644
--- a/Libraries/Interaction/JSEventLoopWatchdog.js
+++ b/Libraries/Interaction/JSEventLoopWatchdog.js
@@ -36,20 +36,20 @@ type Handler = {
  * queried with `getStats`.
  */
 const JSEventLoopWatchdog = {
-  getStats: function(): Object {
+  getStats: function (): Object {
     return {stallCount, totalStallTime, longestStall, acceptableBusyTime};
   },
-  reset: function() {
+  reset: function () {
     infoLog('JSEventLoopWatchdog: reset');
     totalStallTime = 0;
     stallCount = 0;
     longestStall = 0;
     lastInterval = performanceNow();
   },
-  addHandler: function(handler: Handler) {
+  addHandler: function (handler: Handler) {
     handlers.push(handler);
   },
-  install: function({thresholdMS}: {thresholdMS: number, ...}) {
+  install: function ({thresholdMS}: {thresholdMS: number, ...}) {
     acceptableBusyTime = thresholdMS;
     if (installed) {
       return;
@@ -67,12 +67,12 @@ const JSEventLoopWatchdog = {
         let msg =
           `JSEventLoopWatchdog: JS thread busy for ${busyTime}ms. ` +
           `${totalStallTime}ms in ${stallCount} stalls so far. `;
-        handlers.forEach(handler => {
+        handlers.forEach((handler) => {
           msg += handler.onStall({lastInterval, busyTime}) || '';
         });
         infoLog(msg);
       }
-      handlers.forEach(handler => {
+      handlers.forEach((handler) => {
         handler.onIterate && handler.onIterate();
       });
       lastInterval = now;
diff --git a/Libraries/Interaction/TaskQueue.js b/Libraries/Interaction/TaskQueue.js
index bf15d06a090..fe4eadb2560 100644
--- a/Libraries/Interaction/TaskQueue.js
+++ b/Libraries/Interaction/TaskQueue.js
@@ -66,15 +66,15 @@ class TaskQueue {
   }
 
   enqueueTasks(tasks: Array<Task>): void {
-    tasks.forEach(task => this.enqueue(task));
+    tasks.forEach((task) => this.enqueue(task));
   }
 
   cancelTasks(tasksToCancel: Array<Task>): void {
     // search through all tasks and remove them.
     this._queueStack = this._queueStack
-      .map(queue => ({
+      .map((queue) => ({
         ...queue,
-        tasks: queue.tasks.filter(task => tasksToCancel.indexOf(task) === -1),
+        tasks: queue.tasks.filter((task) => tasksToCancel.indexOf(task) === -1),
       }))
       .filter((queue, idx) => queue.tasks.length > 0 || idx === 0);
   }
@@ -171,10 +171,8 @@ class TaskQueue {
         this._queueStack[stackIdx].popable = true;
         this.hasTasksToProcess() && this._onMoreTasks();
       })
-      .catch(ex => {
-        ex.message = `TaskQueue: Error resolving Promise in task ${
-          task.name
-        }: ${ex.message}`;
+      .catch((ex) => {
+        ex.message = `TaskQueue: Error resolving Promise in task ${task.name}: ${ex.message}`;
         throw ex;
       })
       .done();
diff --git a/Libraries/Interaction/TouchHistoryMath.js b/Libraries/Interaction/TouchHistoryMath.js
index 19cf76a9f1b..2cf7704b3f2 100644
--- a/Libraries/Interaction/TouchHistoryMath.js
+++ b/Libraries/Interaction/TouchHistoryMath.js
@@ -24,7 +24,7 @@ const TouchHistoryMath = {
    * touches vs. previous centroid of now actively moving touches.
    * @return {number} value of centroid in specified dimension.
    */
-  centroidDimension: function(
+  centroidDimension: function (
     touchHistory,
     touchesChangedAfter,
     isXAxis,
@@ -81,7 +81,7 @@ const TouchHistoryMath = {
     return count > 0 ? total / count : TouchHistoryMath.noCentroid;
   },
 
-  currentCentroidXOfTouchesChangedAfter: function(
+  currentCentroidXOfTouchesChangedAfter: function (
     touchHistory,
     touchesChangedAfter,
   ) {
@@ -93,7 +93,7 @@ const TouchHistoryMath = {
     );
   },
 
-  currentCentroidYOfTouchesChangedAfter: function(
+  currentCentroidYOfTouchesChangedAfter: function (
     touchHistory,
     touchesChangedAfter,
   ) {
@@ -105,7 +105,7 @@ const TouchHistoryMath = {
     );
   },
 
-  previousCentroidXOfTouchesChangedAfter: function(
+  previousCentroidXOfTouchesChangedAfter: function (
     touchHistory,
     touchesChangedAfter,
   ) {
@@ -117,7 +117,7 @@ const TouchHistoryMath = {
     );
   },
 
-  previousCentroidYOfTouchesChangedAfter: function(
+  previousCentroidYOfTouchesChangedAfter: function (
     touchHistory,
     touchesChangedAfter,
   ) {
@@ -129,7 +129,7 @@ const TouchHistoryMath = {
     );
   },
 
-  currentCentroidX: function(touchHistory) {
+  currentCentroidX: function (touchHistory) {
     return TouchHistoryMath.centroidDimension(
       touchHistory,
       0, // touchesChangedAfter
@@ -138,7 +138,7 @@ const TouchHistoryMath = {
     );
   },
 
-  currentCentroidY: function(touchHistory) {
+  currentCentroidY: function (touchHistory) {
     return TouchHistoryMath.centroidDimension(
       touchHistory,
       0, // touchesChangedAfter
diff --git a/Libraries/Interaction/__tests__/InteractionManager-test.js b/Libraries/Interaction/__tests__/InteractionManager-test.js
index a9abd62f5c6..d156ba58521 100644
--- a/Libraries/Interaction/__tests__/InteractionManager-test.js
+++ b/Libraries/Interaction/__tests__/InteractionManager-test.js
@@ -177,7 +177,7 @@ describe('promise tasks', () => {
   it('should run a basic promise task', () => {
     const task1 = jest.fn(() => {
       expect(++sequenceId).toBe(1);
-      return new Promise(resolve => resolve());
+      return new Promise((resolve) => resolve());
     });
     InteractionManager.runAfterInteractions({gen: task1, name: 'gen1'});
     jest.runAllTimers();
@@ -187,7 +187,7 @@ describe('promise tasks', () => {
   it('should handle nested promises', () => {
     const task1 = jest.fn(() => {
       expect(++sequenceId).toBe(1);
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         InteractionManager.runAfterInteractions({
           gen: task2,
           name: 'gen2',
@@ -196,7 +196,7 @@ describe('promise tasks', () => {
     });
     const task2 = jest.fn(() => {
       expect(++sequenceId).toBe(2);
-      return new Promise(resolve => resolve());
+      return new Promise((resolve) => resolve());
     });
     InteractionManager.runAfterInteractions({gen: task1, name: 'gen1'});
     jest.runAllTimers();
@@ -208,7 +208,7 @@ describe('promise tasks', () => {
     const task1 = createSequenceTask(1);
     const task2 = jest.fn(() => {
       expect(++sequenceId).toBe(2);
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         setTimeout(() => {
           InteractionManager.runAfterInteractions(task3).then(resolve);
         }, 1);
@@ -262,13 +262,13 @@ describe('promise tasks', () => {
     expectToBeCalledOnce(task2);
   });
 
-  const bigAsyncTest = resolveTest => {
+  const bigAsyncTest = (resolveTest) => {
     jest.useRealTimers();
 
     const task1 = createSequenceTask(1);
     const task2 = jest.fn(() => {
       expect(++sequenceId).toBe(2);
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         InteractionManager.runAfterInteractions(task3);
         setTimeout(() => {
           InteractionManager.runAfterInteractions({
@@ -281,7 +281,7 @@ describe('promise tasks', () => {
     const task3 = createSequenceTask(3);
     const task4 = jest.fn(() => {
       expect(++sequenceId).toBe(4);
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         InteractionManager.runAfterInteractions(task5).then(resolve);
       });
     });
diff --git a/Libraries/Interaction/__tests__/TaskQueue-test.js b/Libraries/Interaction/__tests__/TaskQueue-test.js
index 5055fa2dde8..f4e03b47357 100644
--- a/Libraries/Interaction/__tests__/TaskQueue-test.js
+++ b/Libraries/Interaction/__tests__/TaskQueue-test.js
@@ -51,7 +51,7 @@ describe('TaskQueue', () => {
 
   it('should handle blocking promise task', () => {
     const task1 = jest.fn(() => {
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         setTimeout(() => {
           expect(++sequenceId).toBe(1);
           resolve();
@@ -94,7 +94,7 @@ describe('TaskQueue', () => {
 
   it('should handle nested promises', () => {
     const task1 = jest.fn(() => {
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         setTimeout(() => {
           expect(++sequenceId).toBe(1);
           taskQueue.enqueue({gen: task2, name: 'gen2'});
@@ -103,7 +103,7 @@ describe('TaskQueue', () => {
       });
     });
     const task2 = jest.fn(() => {
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         setTimeout(() => {
           expect(++sequenceId).toBe(2);
           taskQueue.enqueue({run: task3, name: 'run3'});
diff --git a/Libraries/LayoutAnimation/LayoutAnimation.js b/Libraries/LayoutAnimation/LayoutAnimation.js
index ba4632eb712..872ca05ec90 100644
--- a/Libraries/LayoutAnimation/LayoutAnimation.js
+++ b/Libraries/LayoutAnimation/LayoutAnimation.js
@@ -47,8 +47,8 @@ function configureNext(
   if (!Platform.isTesting) {
     UIManager.configureNextLayoutAnimation(
       config,
-      onAnimationDidEnd ?? function() {},
-      function() {} /* unused onError */,
+      onAnimationDidEnd ?? function () {},
+      function () {} /* unused onError */,
     );
   }
 }
diff --git a/Libraries/Lists/FillRateHelper.js b/Libraries/Lists/FillRateHelper.js
index a1d58669c48..678ea593399 100644
--- a/Libraries/Lists/FillRateHelper.js
+++ b/Libraries/Lists/FillRateHelper.js
@@ -58,7 +58,7 @@ class FillRateHelper {
   _samplesStartTime = (null: ?number);
 
   static addListener(
-    callback: FillRateInfo => void,
+    callback: (FillRateInfo) => void,
   ): {remove: () => void, ...} {
     warning(
       _sampleRate !== null,
@@ -67,7 +67,7 @@ class FillRateHelper {
     _listeners.push(callback);
     return {
       remove: () => {
-        _listeners = _listeners.filter(listener => callback !== listener);
+        _listeners = _listeners.filter((listener) => callback !== listener);
       },
     };
   }
@@ -131,7 +131,7 @@ class FillRateHelper {
       }
       console.debug('FillRateHelper deactivateAndFlush: ', {derived, info});
     }
-    _listeners.forEach(listener => listener(info));
+    _listeners.forEach((listener) => listener(info));
     this._resetData();
   }
 
diff --git a/Libraries/Lists/FlatList.js b/Libraries/Lists/FlatList.js
index fac01144957..c9ab0afee3d 100644
--- a/Libraries/Lists/FlatList.js
+++ b/Libraries/Lists/FlatList.js
@@ -405,7 +405,7 @@ class FlatList<ItemT> extends React.PureComponent<Props<ItemT>, void> {
     this._checkProps(this.props);
     if (this.props.viewabilityConfigCallbackPairs) {
       this._virtualizedListPairs = this.props.viewabilityConfigCallbackPairs.map(
-        pair => ({
+        (pair) => ({
           viewabilityConfig: pair.viewabilityConfig,
           onViewableItemsChanged: this._createOnViewableItemsChanged(
             pair.onViewableItemsChanged,
@@ -451,7 +451,7 @@ class FlatList<ItemT> extends React.PureComponent<Props<ItemT>, void> {
   _listRef: ?React.ElementRef<typeof VirtualizedList>;
   _virtualizedListPairs: Array<ViewabilityConfigCallbackPair> = [];
 
-  _captureRef = ref => {
+  _captureRef = (ref) => {
     this._listRef = ref;
   };
 
@@ -555,10 +555,12 @@ class FlatList<ItemT> extends React.PureComponent<Props<ItemT>, void> {
         if (numColumns > 1) {
           const changed = [];
           const viewableItems = [];
-          info.viewableItems.forEach(v =>
+          info.viewableItems.forEach((v) =>
             this._pushMultiColumnViewable(viewableItems, v),
           );
-          info.changed.forEach(v => this._pushMultiColumnViewable(changed, v));
+          info.changed.forEach((v) =>
+            this._pushMultiColumnViewable(changed, v),
+          );
           onViewableItemsChanged({viewableItems, changed});
         } else {
           onViewableItemsChanged(info);
@@ -602,11 +604,7 @@ class FlatList<ItemT> extends React.PureComponent<Props<ItemT>, void> {
             'Expected array of items with numColumns > 1',
           );
           return (
-            <View
-              style={StyleSheet.compose(
-                styles.row,
-                columnWrapperStyle,
-              )}>
+            <View style={StyleSheet.compose(styles.row, columnWrapperStyle)}>
               {item.map((it, kk) => {
                 const element = renderer({
                   item: it,
diff --git a/Libraries/Lists/SectionList.js b/Libraries/Lists/SectionList.js
index 0f20fa7ed93..c318a0a0626 100644
--- a/Libraries/Lists/SectionList.js
+++ b/Libraries/Lists/SectionList.js
@@ -246,14 +246,14 @@ class SectionList<SectionT: SectionBase<any>> extends React.PureComponent<
       <VirtualizedSectionList
         {...this.props}
         ref={this._captureRef}
-        getItemCount={items => items.length}
+        getItemCount={(items) => items.length}
         getItem={(items, index) => items[index]}
       />
     );
   }
 
   _wrapperListRef: ?React.ElementRef<typeof VirtualizedSectionList>;
-  _captureRef = ref => {
+  _captureRef = (ref) => {
     /* $FlowFixMe(>=0.99.0 site=react_native_fb) This comment suppresses an
      * error found when Flow v0.99 was deployed. To see the error, delete this
      * comment and run Flow. */
diff --git a/Libraries/Lists/ViewabilityHelper.js b/Libraries/Lists/ViewabilityHelper.js
index 48425b00707..3b6b1912a9f 100644
--- a/Libraries/Lists/ViewabilityHelper.js
+++ b/Libraries/Lists/ViewabilityHelper.js
@@ -270,12 +270,12 @@ class ViewabilityHelper {
     createViewToken,
   ) {
     // Filter out indices that have gone out of view since this call was scheduled.
-    viewableIndicesToCheck = viewableIndicesToCheck.filter(ii =>
+    viewableIndicesToCheck = viewableIndicesToCheck.filter((ii) =>
       this._viewableIndices.includes(ii),
     );
     const prevItems = this._viewableItems;
     const nextItems = new Map(
-      viewableIndicesToCheck.map(ii => {
+      viewableIndicesToCheck.map((ii) => {
         const viewable = createViewToken(ii, true);
         return [viewable.key, viewable];
       }),
diff --git a/Libraries/Lists/VirtualizedList.js b/Libraries/Lists/VirtualizedList.js
index 2fcf4b36d7e..d21ff713e06 100644
--- a/Libraries/Lists/VirtualizedList.js
+++ b/Libraries/Lists/VirtualizedList.js
@@ -419,9 +419,9 @@ class VirtualizedList extends React.PureComponent<Props, State> {
     const {animated, index, viewOffset, viewPosition} = params;
     invariant(
       index >= 0 && index < getItemCount(data),
-      `scrollToIndex out of range: requested index ${index} but maximum is ${getItemCount(
-        data,
-      ) - 1}`,
+      `scrollToIndex out of range: requested index ${index} but maximum is ${
+        getItemCount(data) - 1
+      }`,
     );
     if (!getItemLayout && index > this._highestMeasuredFrameIndex) {
       invariant(
@@ -496,10 +496,10 @@ class VirtualizedList extends React.PureComponent<Props, State> {
   }
 
   recordInteraction() {
-    this._nestedChildLists.forEach(childList => {
+    this._nestedChildLists.forEach((childList) => {
       childList.ref && childList.ref.recordInteraction();
     });
-    this._viewabilityTuples.forEach(t => {
+    this._viewabilityTuples.forEach((t) => {
       t.viewabilityHelper.recordInteraction();
     });
     this._updateViewableItems(this.props.data);
@@ -642,7 +642,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
       },
       horizontal: ?boolean,
       getOutermostParentListRef: Function,
-      getNestedChildState: string => ?ChildListState,
+      getNestedChildState: (string) => ?ChildListState,
       registerAsNestedChild: ({
         cellKey: string,
         key: string,
@@ -786,7 +786,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
 
     if (this.props.viewabilityConfigCallbackPairs) {
       this._viewabilityTuples = this.props.viewabilityConfigCallbackPairs.map(
-        pair => ({
+        (pair) => ({
           viewabilityHelper: new ViewabilityHelper(pair.viewabilityConfig),
           onViewableItemsChanged: pair.onViewableItemsChanged,
         }),
@@ -849,7 +849,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
     }
     this._updateViewableItems(null);
     this._updateCellsToRenderBatcher.dispose({abort: true});
-    this._viewabilityTuples.forEach(tuple => {
+    this._viewabilityTuples.forEach((tuple) => {
       tuple.viewabilityHelper.dispose();
     });
     this._fillRateHelper.deactivateAndFlush();
@@ -909,10 +909,10 @@ class VirtualizedList extends React.PureComponent<Props, State> {
           key={key}
           prevCellKey={prevCellKey}
           onUpdateSeparators={this._onUpdateSeparators}
-          onLayout={e => this._onCellLayout(e, key, ii)}
+          onLayout={(e) => this._onCellLayout(e, key, ii)}
           onUnmount={this._onCellUnmount}
           parentProps={this.props}
-          ref={ref => {
+          ref={(ref) => {
             this._cellRefs[key] = ref;
           }}
         />,
@@ -922,7 +922,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
   }
 
   _onUpdateSeparators = (keys: Array<?string>, newProps: Object) => {
-    keys.forEach(key => {
+    keys.forEach((key) => {
       const ref = key != null && this._cellRefs[key];
       ref && ref.updateSeparatorProps(newProps);
     });
@@ -1111,16 +1111,13 @@ class VirtualizedList extends React.PureComponent<Props, State> {
       cells.push(
         React.cloneElement(element, {
           key: '$empty',
-          onLayout: event => {
+          onLayout: (event) => {
             this._onLayoutEmpty(event);
             if (element.props.onLayout) {
               element.props.onLayout(event);
             }
           },
-          style: StyleSheet.compose(
-            inversionStyle,
-            element.props.style,
-          ),
+          style: StyleSheet.compose(inversionStyle, element.props.style),
         }),
       );
     }
@@ -1184,7 +1181,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
     if (__DEV__) {
       ret = (
         <ScrollView.Context.Consumer>
-          {scrollContext => {
+          {(scrollContext) => {
             if (
               scrollContext != null &&
               !scrollContext.horizontal === !this.props.horizontal &&
@@ -1222,7 +1219,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
 
       // clear the viewableIndices cache to also trigger
       // the onViewableItemsChanged callback with the new data
-      this._viewabilityTuples.forEach(tuple => {
+      this._viewabilityTuples.forEach((tuple) => {
         tuple.viewabilityHelper.resetViewableIndices();
       });
     }
@@ -1283,7 +1280,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
   _updateCellsToRenderBatcher: Batchinator;
   _viewabilityTuples: Array<ViewabilityHelperCallbackTuple> = [];
 
-  _captureScrollRef = ref => {
+  _captureScrollRef = (ref) => {
     this._scrollRef = ref;
   };
 
@@ -1295,7 +1292,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
     );
   }
 
-  _defaultRenderScrollComponent = props => {
+  _defaultRenderScrollComponent = (props) => {
     const onRefresh = props.onRefresh;
     if (this._isNestedWithSameOrientation()) {
       // $FlowFixMe - Typing ReactNativeComponent revealed errors
@@ -1413,7 +1410,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
           this._scrollMetrics.visibleLength = scrollMetrics.visibleLength;
           this._scrollMetrics.offset = scrollMetrics.offset;
         },
-        error => {
+        (error) => {
           console.warn(
             "VirtualizedList: Encountered an error while measuring a list's" +
               ' offset from its containing VirtualizedList.',
@@ -1443,7 +1440,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
     this._maybeCallOnEndReached();
   };
 
-  _onLayoutEmpty = e => {
+  _onLayoutEmpty = (e) => {
     this.props.onLayout && this.props.onLayout(e);
   };
 
@@ -1451,12 +1448,12 @@ class VirtualizedList extends React.PureComponent<Props, State> {
     return this._getCellKey() + '-footer';
   }
 
-  _onLayoutFooter = e => {
+  _onLayoutFooter = (e) => {
     this._triggerRemeasureForChildListsInCell(this._getFooterCellKey());
     this._footerLength = this._selectLength(e.nativeEvent.layout);
   };
 
-  _onLayoutHeader = e => {
+  _onLayoutHeader = (e) => {
     this._headerLength = this._selectLength(e.nativeEvent.layout);
   };
 
@@ -1612,7 +1609,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
   };
 
   _onScroll = (e: Object) => {
-    this._nestedChildLists.forEach(childList => {
+    this._nestedChildLists.forEach((childList) => {
       childList.ref && childList.ref._onScroll(e);
     });
     if (this.props.onScroll) {
@@ -1732,10 +1729,10 @@ class VirtualizedList extends React.PureComponent<Props, State> {
   }
 
   _onScrollBeginDrag = (e): void => {
-    this._nestedChildLists.forEach(childList => {
+    this._nestedChildLists.forEach((childList) => {
       childList.ref && childList.ref._onScrollBeginDrag(e);
     });
-    this._viewabilityTuples.forEach(tuple => {
+    this._viewabilityTuples.forEach((tuple) => {
       tuple.viewabilityHelper.recordInteraction();
     });
     this._hasInteracted = true;
@@ -1764,7 +1761,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
     if (!data) {
       return;
     }
-    this.setState(state => {
+    this.setState((state) => {
       let newState;
       const {contentLength, offset, visibleLength} = this._scrollMetrics;
       if (!isVirtualizationDisabled) {
@@ -1920,7 +1917,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
   _updateViewableItems(data: any) {
     const {getItemCount} = this.props;
 
-    this._viewabilityTuples.forEach(tuple => {
+    this._viewabilityTuples.forEach((tuple) => {
       tuple.viewabilityHelper.onUpdate(
         getItemCount(data),
         this._scrollMetrics.offset,
@@ -2036,7 +2033,7 @@ class CellRenderer extends React.Component<
   };
 
   updateSeparatorProps(newProps: Object) {
-    this.setState(state => ({
+    this.setState((state) => ({
       separatorProps: {...state.separatorProps, ...newProps},
     }));
   }
diff --git a/Libraries/Lists/VirtualizedSectionList.js b/Libraries/Lists/VirtualizedSectionList.js
index 53eb54be609..0a501ad15e7 100644
--- a/Libraries/Lists/VirtualizedSectionList.js
+++ b/Libraries/Lists/VirtualizedSectionList.js
@@ -376,7 +376,7 @@ class VirtualizedSectionList<
           leadingSection={info.leadingSection}
           onUpdateSeparator={this._onUpdateSeparator}
           prevCellKey={(this._subExtractor(index - 1) || {}).key}
-          ref={ref => {
+          ref={(ref) => {
             this._cellRefs[info.key] = ref;
           }}
           renderItem={renderItem}
@@ -419,7 +419,7 @@ class VirtualizedSectionList<
 
   _cellRefs = {};
   _listRef: VirtualizedList;
-  _captureRef = ref => {
+  _captureRef = (ref) => {
     /* $FlowFixMe(>=0.53.0 site=react_native_fb,react_native_oss) This comment
      * suppresses an error when upgrading Flow's support for React. To see the
      * error delete this comment and run Flow. */
@@ -485,19 +485,19 @@ class ItemWithSeparator extends React.Component<
 
   _separators = {
     highlight: () => {
-      ['leading', 'trailing'].forEach(s =>
+      ['leading', 'trailing'].forEach((s) =>
         this._separators.updateProps(s, {highlighted: true}),
       );
     },
     unhighlight: () => {
-      ['leading', 'trailing'].forEach(s =>
+      ['leading', 'trailing'].forEach((s) =>
         this._separators.updateProps(s, {highlighted: false}),
       );
     },
     updateProps: (select: 'leading' | 'trailing', newProps: Object) => {
       const {LeadingSeparatorComponent, cellKey, prevCellKey} = this.props;
       if (select === 'leading' && LeadingSeparatorComponent != null) {
-        this.setState(state => ({
+        this.setState((state) => ({
           leadingSeparatorProps: {...state.leadingSeparatorProps, ...newProps},
         }));
       } else {
@@ -534,7 +534,7 @@ class ItemWithSeparator extends React.Component<
   }
 
   updateSeparatorProps(newProps: Object) {
-    this.setState(state => ({
+    this.setState((state) => ({
       separatorProps: {...state.separatorProps, ...newProps},
     }));
   }
diff --git a/Libraries/Lists/__flowtests__/FlatList-flowtest.js b/Libraries/Lists/__flowtests__/FlatList-flowtest.js
index 912289cbf00..4581b92621e 100644
--- a/Libraries/Lists/__flowtests__/FlatList-flowtest.js
+++ b/Libraries/Lists/__flowtests__/FlatList-flowtest.js
@@ -62,7 +62,7 @@ module.exports = {
     ];
     return (
       <FlatList
-        renderItem={info => (
+        renderItem={(info) => (
           <span>
             {
               // $FlowExpectedError - bad widgetCount type 6, should be Object
diff --git a/Libraries/Lists/__tests__/FillRateHelper-test.js b/Libraries/Lists/__tests__/FillRateHelper-test.js
index a0b0b3b4f48..31ce11f3349 100644
--- a/Libraries/Lists/__tests__/FillRateHelper-test.js
+++ b/Libraries/Lists/__tests__/FillRateHelper-test.js
@@ -31,7 +31,7 @@ function computeResult({helper, props, state, scroll}): number {
   return helper.computeBlankness(
     {
       data: dataGlobal,
-      getItemCount: data2 => data2.length,
+      getItemCount: (data2) => data2.length,
       initialNumToRender: 10,
       ...(props || {}),
     },
@@ -40,13 +40,13 @@ function computeResult({helper, props, state, scroll}): number {
   );
 }
 
-describe('computeBlankness', function() {
+describe('computeBlankness', function () {
   beforeEach(() => {
     FillRateHelper.setSampleRate(1);
     FillRateHelper.setMinSampleCount(0);
   });
 
-  it('computes correct blankness of viewport', function() {
+  it('computes correct blankness of viewport', function () {
     const helper = new FillRateHelper(getFrameMetrics);
     rowFramesGlobal = {
       header: {y: 0, height: 0, inLayout: true},
@@ -65,7 +65,7 @@ describe('computeBlankness', function() {
     expect(blankness).toBe(1);
   });
 
-  it('skips frames that are not in layout', function() {
+  it('skips frames that are not in layout', function () {
     const helper = new FillRateHelper(getFrameMetrics);
     rowFramesGlobal = {
       header: {y: 0, height: 0, inLayout: false},
@@ -79,7 +79,7 @@ describe('computeBlankness', function() {
     expect(blankness).toBe(0.3);
   });
 
-  it('sampling rate can disable', function() {
+  it('sampling rate can disable', function () {
     let helper = new FillRateHelper(getFrameMetrics);
     rowFramesGlobal = {
       header: {y: 0, height: 0, inLayout: true},
@@ -96,9 +96,9 @@ describe('computeBlankness', function() {
     expect(blankness).toBe(0);
   });
 
-  it('can handle multiple listeners and unsubscribe', function() {
+  it('can handle multiple listeners and unsubscribe', function () {
     const listeners = [jest.fn(), jest.fn(), jest.fn()];
-    const subscriptions = listeners.map(listener =>
+    const subscriptions = listeners.map((listener) =>
       FillRateHelper.addListener(listener),
     );
     subscriptions[1].remove();
diff --git a/Libraries/Lists/__tests__/FlatList-test.js b/Libraries/Lists/__tests__/FlatList-test.js
index eb7e648d258..db456aac10a 100644
--- a/Libraries/Lists/__tests__/FlatList-test.js
+++ b/Libraries/Lists/__tests__/FlatList-test.js
@@ -102,13 +102,13 @@ describe('FlatList', () => {
     ReactTestRenderer.create(
       <FlatList
         data={[{key: 'outer0'}, {key: 'outer1'}]}
-        renderItem={outerInfo => (
+        renderItem={(outerInfo) => (
           <FlatList
             data={[
               {key: outerInfo.item.key + ':inner0'},
               {key: outerInfo.item.key + ':inner1'},
             ]}
-            renderItem={innerInfo => {
+            renderItem={(innerInfo) => {
               return <item title={innerInfo.item.key} />;
             }}
             ref={listRef}
diff --git a/Libraries/Lists/__tests__/SectionList-test.js b/Libraries/Lists/__tests__/SectionList-test.js
index 93e31f9a329..e0071172b84 100644
--- a/Libraries/Lists/__tests__/SectionList-test.js
+++ b/Libraries/Lists/__tests__/SectionList-test.js
@@ -39,21 +39,21 @@ describe('SectionList', () => {
     const component = ReactTestRenderer.create(
       <SectionList
         initialNumToRender={Infinity}
-        ItemSeparatorComponent={props => (
+        ItemSeparatorComponent={(props) => (
           <defaultItemSeparator v={propStr(props)} />
         )}
-        ListEmptyComponent={props => <empty v={propStr(props)} />}
-        ListFooterComponent={props => <footer v={propStr(props)} />}
-        ListHeaderComponent={props => <header v={propStr(props)} />}
-        SectionSeparatorComponent={props => (
+        ListEmptyComponent={(props) => <empty v={propStr(props)} />}
+        ListFooterComponent={(props) => <footer v={propStr(props)} />}
+        ListHeaderComponent={(props) => <header v={propStr(props)} />}
+        SectionSeparatorComponent={(props) => (
           <sectionSeparator v={propStr(props)} />
         )}
         sections={[
           {
-            renderItem: props => <itemForSection1 v={propStr(props)} />,
+            renderItem: (props) => <itemForSection1 v={propStr(props)} />,
             key: 's1',
             keyExtractor: (item, index) => item.id,
-            ItemSeparatorComponent: props => (
+            ItemSeparatorComponent: (props) => (
               <itemSeparatorForSection1 v={propStr(props)} />
             ),
             data: [{id: 'i1s1'}, {id: 'i2s1'}],
@@ -69,9 +69,9 @@ describe('SectionList', () => {
         ]}
         refreshing={false}
         onRefresh={jest.fn()}
-        renderItem={props => <defaultItem v={propStr(props)} />}
-        renderSectionHeader={props => <sectionHeader v={propStr(props)} />}
-        renderSectionFooter={props => <sectionFooter v={propStr(props)} />}
+        renderItem={(props) => <defaultItem v={propStr(props)} />}
+        renderSectionHeader={(props) => <sectionHeader v={propStr(props)} />}
+        renderSectionFooter={(props) => <sectionFooter v={propStr(props)} />}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -81,8 +81,8 @@ describe('SectionList', () => {
       <SectionList
         sections={[{key: 's1', data: []}]}
         renderItem={({item}) => <item v={item.key} />}
-        renderSectionHeader={props => <sectionHeader v={propStr(props)} />}
-        renderSectionFooter={props => <sectionFooter v={propStr(props)} />}
+        renderSectionHeader={(props) => <sectionHeader v={propStr(props)} />}
+        renderSectionFooter={(props) => <sectionFooter v={propStr(props)} />}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -92,7 +92,7 @@ describe('SectionList', () => {
       <SectionList
         sections={[{key: 's1', data: []}]}
         renderItem={({item}) => <item v={item.key} />}
-        renderSectionFooter={props => <sectionFooter v={propStr(props)} />}
+        renderSectionFooter={(props) => <sectionFooter v={propStr(props)} />}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -101,7 +101,7 @@ describe('SectionList', () => {
 
 function propStr(props) {
   return Object.keys(props)
-    .map(k => {
+    .map((k) => {
       const propObj = props[k] || {};
       return `${k}:${propObj.key || propObj.id || props[k]}`;
     })
diff --git a/Libraries/Lists/__tests__/ViewabilityHelper-test.js b/Libraries/Lists/__tests__/ViewabilityHelper-test.js
index 81ffdb731cc..301679785f9 100644
--- a/Libraries/Lists/__tests__/ViewabilityHelper-test.js
+++ b/Libraries/Lists/__tests__/ViewabilityHelper-test.js
@@ -22,8 +22,8 @@ function createViewToken(index: number, isViewable: boolean) {
   return {key: data[index].key, isViewable};
 }
 
-describe('computeViewableItems', function() {
-  it('returns all 4 entirely visible rows as viewable', function() {
+describe('computeViewableItems', function () {
+  it('returns all 4 entirely visible rows as viewable', function () {
     const helper = new ViewabilityHelper({
       viewAreaCoveragePercentThreshold: 50,
     });
@@ -39,7 +39,7 @@ describe('computeViewableItems', function() {
     ).toEqual([0, 1, 2, 3]);
   });
 
-  it('returns top 2 rows as viewable (1. entirely visible and 2. majority)', function() {
+  it('returns top 2 rows as viewable (1. entirely visible and 2. majority)', function () {
     const helper = new ViewabilityHelper({
       viewAreaCoveragePercentThreshold: 50,
     });
@@ -55,7 +55,7 @@ describe('computeViewableItems', function() {
     ).toEqual([0, 1]);
   });
 
-  it('returns only 2nd row as viewable (majority)', function() {
+  it('returns only 2nd row as viewable (majority)', function () {
     const helper = new ViewabilityHelper({
       viewAreaCoveragePercentThreshold: 50,
     });
@@ -71,7 +71,7 @@ describe('computeViewableItems', function() {
     ).toEqual([1]);
   });
 
-  it('handles empty input', function() {
+  it('handles empty input', function () {
     const helper = new ViewabilityHelper({
       viewAreaCoveragePercentThreshold: 50,
     });
@@ -82,7 +82,7 @@ describe('computeViewableItems', function() {
     ).toEqual([]);
   });
 
-  it('handles different view area coverage percent thresholds', function() {
+  it('handles different view area coverage percent thresholds', function () {
     rowFrames = {
       a: {y: 0, height: 50},
       b: {y: 50, height: 150},
@@ -128,7 +128,7 @@ describe('computeViewableItems', function() {
     ).toEqual([1, 2]);
   });
 
-  it('handles different item visible percent thresholds', function() {
+  it('handles different item visible percent thresholds', function () {
     rowFrames = {
       a: {y: 0, height: 50},
       b: {y: 50, height: 150},
@@ -165,8 +165,8 @@ describe('computeViewableItems', function() {
   });
 });
 
-describe('onUpdate', function() {
-  it('returns 1 visible row as viewable then scrolls away', function() {
+describe('onUpdate', function () {
+  it('returns 1 visible row as viewable then scrolls away', function () {
     const helper = new ViewabilityHelper();
     rowFrames = {
       a: {y: 0, height: 50},
@@ -212,7 +212,7 @@ describe('onUpdate', function() {
     });
   });
 
-  it('returns 1st visible row then 1st and 2nd then just 2nd', function() {
+  it('returns 1st visible row then 1st and 2nd then just 2nd', function () {
     const helper = new ViewabilityHelper();
     rowFrames = {
       a: {y: 0, height: 200},
@@ -268,7 +268,7 @@ describe('onUpdate', function() {
     });
   });
 
-  it('minimumViewTime delays callback', function() {
+  it('minimumViewTime delays callback', function () {
     const helper = new ViewabilityHelper({
       minimumViewTime: 350,
       viewAreaCoveragePercentThreshold: 0,
@@ -302,7 +302,7 @@ describe('onUpdate', function() {
     });
   });
 
-  it('minimumViewTime skips briefly visible items', function() {
+  it('minimumViewTime skips briefly visible items', function () {
     const helper = new ViewabilityHelper({
       minimumViewTime: 350,
       viewAreaCoveragePercentThreshold: 0,
@@ -343,7 +343,7 @@ describe('onUpdate', function() {
     });
   });
 
-  it('waitForInteraction blocks callback until interaction', function() {
+  it('waitForInteraction blocks callback until interaction', function () {
     const helper = new ViewabilityHelper({
       waitForInteraction: true,
       viewAreaCoveragePercentThreshold: 0,
@@ -385,7 +385,7 @@ describe('onUpdate', function() {
     });
   });
 
-  it('returns the right visible row after the underlying data changed', function() {
+  it('returns the right visible row after the underlying data changed', function () {
     const helper = new ViewabilityHelper();
     rowFrames = {
       a: {y: 0, height: 200},
@@ -429,7 +429,10 @@ describe('onUpdate', function() {
 
     expect(onViewableItemsChanged.mock.calls.length).toBe(2);
     expect(onViewableItemsChanged.mock.calls[1][0]).toEqual({
-      changed: [{isViewable: true, key: 'c'}, {isViewable: false, key: 'a'}],
+      changed: [
+        {isViewable: true, key: 'c'},
+        {isViewable: false, key: 'a'},
+      ],
       viewabilityConfig: {viewAreaCoveragePercentThreshold: 0},
       viewableItems: [{isViewable: true, key: 'c'}],
     });
diff --git a/Libraries/Lists/__tests__/VirtualizeUtils-test.js b/Libraries/Lists/__tests__/VirtualizeUtils-test.js
index b2620c90265..10e7a56cac6 100644
--- a/Libraries/Lists/__tests__/VirtualizeUtils-test.js
+++ b/Libraries/Lists/__tests__/VirtualizeUtils-test.js
@@ -15,35 +15,35 @@ const {
   newRangeCount,
 } = require('../VirtualizeUtils');
 
-describe('newRangeCount', function() {
-  it('handles subset', function() {
+describe('newRangeCount', function () {
+  it('handles subset', function () {
     expect(newRangeCount({first: 1, last: 4}, {first: 2, last: 3})).toBe(0);
   });
-  it('handles forward disjoint set', function() {
+  it('handles forward disjoint set', function () {
     expect(newRangeCount({first: 1, last: 4}, {first: 6, last: 9})).toBe(4);
   });
-  it('handles reverse disjoint set', function() {
+  it('handles reverse disjoint set', function () {
     expect(newRangeCount({first: 6, last: 8}, {first: 1, last: 4})).toBe(4);
   });
-  it('handles superset', function() {
+  it('handles superset', function () {
     expect(newRangeCount({first: 1, last: 4}, {first: 0, last: 5})).toBe(2);
   });
-  it('handles end extension', function() {
+  it('handles end extension', function () {
     expect(newRangeCount({first: 1, last: 4}, {first: 1, last: 8})).toBe(4);
   });
-  it('handles front extension', function() {
+  it('handles front extension', function () {
     expect(newRangeCount({first: 1, last: 4}, {first: 0, last: 4})).toBe(1);
   });
-  it('handles forward intersect', function() {
+  it('handles forward intersect', function () {
     expect(newRangeCount({first: 1, last: 4}, {first: 3, last: 6})).toBe(2);
   });
-  it('handles reverse intersect', function() {
+  it('handles reverse intersect', function () {
     expect(newRangeCount({first: 3, last: 6}, {first: 1, last: 4})).toBe(2);
   });
 });
 
-describe('elementsThatOverlapOffsets', function() {
-  it('handles fixed length', function() {
+describe('elementsThatOverlapOffsets', function () {
+  it('handles fixed length', function () {
     const offsets = [0, 250, 350, 450];
     function getFrameMetrics(index: number) {
       return {
@@ -58,7 +58,7 @@ describe('elementsThatOverlapOffsets', function() {
       4,
     ]);
   });
-  it('handles variable length', function() {
+  it('handles variable length', function () {
     const offsets = [150, 250, 900];
     const frames = [
       {offset: 0, length: 50},
@@ -68,10 +68,10 @@ describe('elementsThatOverlapOffsets', function() {
       {offset: 950, length: 150},
     ];
     expect(
-      elementsThatOverlapOffsets(offsets, frames.length, ii => frames[ii]),
+      elementsThatOverlapOffsets(offsets, frames.length, (ii) => frames[ii]),
     ).toEqual([1, 1, 3]);
   });
-  it('handles out of bounds', function() {
+  it('handles out of bounds', function () {
     const offsets = [150, 900];
     const frames = [
       {offset: 0, length: 50},
@@ -79,10 +79,10 @@ describe('elementsThatOverlapOffsets', function() {
       {offset: 250, length: 100},
     ];
     expect(
-      elementsThatOverlapOffsets(offsets, frames.length, ii => frames[ii]),
+      elementsThatOverlapOffsets(offsets, frames.length, (ii) => frames[ii]),
     ).toEqual([1]);
   });
-  it('errors on non-increasing offsets', function() {
+  it('errors on non-increasing offsets', function () {
     const offsets = [150, 50];
     const frames = [
       {offset: 0, length: 50},
@@ -90,7 +90,7 @@ describe('elementsThatOverlapOffsets', function() {
       {offset: 250, length: 100},
     ];
     expect(() => {
-      elementsThatOverlapOffsets(offsets, frames.length, ii => frames[ii]);
+      elementsThatOverlapOffsets(offsets, frames.length, (ii) => frames[ii]);
     }).toThrowErrorMatchingSnapshot();
   });
 });
diff --git a/Libraries/Lists/__tests__/VirtualizedList-test.js b/Libraries/Lists/__tests__/VirtualizedList-test.js
index d5ff7b46841..6790da32971 100644
--- a/Libraries/Lists/__tests__/VirtualizedList-test.js
+++ b/Libraries/Lists/__tests__/VirtualizedList-test.js
@@ -22,7 +22,7 @@ describe('VirtualizedList', () => {
         data={[{key: 'i1'}, {key: 'i2'}, {key: 'i3'}]}
         renderItem={({item}) => <item value={item.key} />}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -37,7 +37,7 @@ describe('VirtualizedList', () => {
         data={[{key: 'i1'}, {key: 'i2'}, {key: 'i3'}]}
         ListItemComponent={ListItemComponent}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -56,7 +56,7 @@ describe('VirtualizedList', () => {
           <item value={item.key} testID={`${item.key}-renderItem`} />
         )}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
 
@@ -70,7 +70,7 @@ describe('VirtualizedList', () => {
   it('throws if no renderItem or ListItemComponent', () => {
     // Silence the React error boundary warning; we expect an uncaught error.
     const consoleError = console.error;
-    jest.spyOn(console, 'error').mockImplementation(message => {
+    jest.spyOn(console, 'error').mockImplementation((message) => {
       if (message.startsWith('The above error occured in the ')) {
         return;
       }
@@ -82,7 +82,7 @@ describe('VirtualizedList', () => {
         <VirtualizedList
           data={[{key: 'i1'}, {key: 'i2'}, {key: 'i3'}]}
           getItem={(data, index) => data[index]}
-          getItemCount={data => data.length}
+          getItemCount={(data) => data.length}
         />,
       );
     expect(componentFactory).toThrow(
@@ -98,7 +98,7 @@ describe('VirtualizedList', () => {
         data={[]}
         renderItem={({item}) => <item value={item.key} />}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -110,7 +110,7 @@ describe('VirtualizedList', () => {
         data={undefined}
         renderItem={({item}) => <item value={item.key} />}
         getItem={(data, index) => data[index]}
-        getItemCount={data => 0}
+        getItemCount={(data) => 0}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -124,7 +124,7 @@ describe('VirtualizedList', () => {
         ListFooterComponent={() => <footer />}
         ListHeaderComponent={() => <header />}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
         renderItem={({item}) => <item value={item.key} />}
       />,
     );
@@ -137,7 +137,7 @@ describe('VirtualizedList', () => {
         data={[{key: 'hello'}]}
         ListEmptyComponent={() => <empty />}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
         renderItem={({item}) => <item value={item.key} />}
       />,
     );
@@ -153,7 +153,7 @@ describe('VirtualizedList', () => {
         ListHeaderComponent={() => <header />}
         data={new Array(5).fill().map((_, ii) => ({id: String(ii)}))}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
         getItemLayout={({index}) => ({length: 50, offset: index * 50})}
         inverted={true}
         keyExtractor={(item, index) => item.id}
@@ -181,14 +181,14 @@ describe('VirtualizedList', () => {
     const infos = [];
     const component = ReactTestRenderer.create(
       <VirtualizedList
-        ItemSeparatorComponent={props => <separator {...props} />}
+        ItemSeparatorComponent={(props) => <separator {...props} />}
         data={[{key: 'i0'}, {key: 'i1'}, {key: 'i2'}]}
-        renderItem={info => {
+        renderItem={(info) => {
           infos.push(info);
           return <item title={info.item.key} />;
         }}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -203,22 +203,22 @@ describe('VirtualizedList', () => {
     const component = ReactTestRenderer.create(
       <VirtualizedList
         data={[{key: 'outer0'}, {key: 'outer1'}]}
-        renderItem={outerInfo => (
+        renderItem={(outerInfo) => (
           <VirtualizedList
             data={[
               {key: outerInfo.item.key + ':inner0'},
               {key: outerInfo.item.key + ':inner1'},
             ]}
             horizontal={outerInfo.item.key === 'outer1'}
-            renderItem={innerInfo => {
+            renderItem={(innerInfo) => {
               return <item title={innerInfo.item.key} />;
             }}
             getItem={(data, index) => data[index]}
-            getItemCount={data => data.length}
+            getItemCount={(data) => data.length}
           />
         )}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -239,7 +239,7 @@ describe('VirtualizedList', () => {
       data,
       renderItem: ({item}) => <item value={item.key} />,
       getItem: (items, index) => items[index],
-      getItemCount: items => items.length,
+      getItemCount: (items) => items.length,
       getItemLayout: (items, index) => ({
         length: ITEM_HEIGHT,
         offset: ITEM_HEIGHT * index,
@@ -291,7 +291,7 @@ describe('VirtualizedList', () => {
         data={[{key: 'i1'}, {key: 'i2'}, {key: 'i3'}]}
         renderItem={({item}) => <item value={item.key} />}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
         ref={listRef}
       />,
     );
@@ -309,22 +309,22 @@ describe('VirtualizedList', () => {
     ReactTestRenderer.create(
       <VirtualizedList
         data={[{key: 'outer0'}, {key: 'outer1'}]}
-        renderItem={outerInfo => (
+        renderItem={(outerInfo) => (
           <VirtualizedList
             data={[
               {key: outerInfo.item.key + ':inner0'},
               {key: outerInfo.item.key + ':inner1'},
             ]}
-            renderItem={innerInfo => {
+            renderItem={(innerInfo) => {
               return <item title={innerInfo.item.key} />;
             }}
             getItem={(data, index) => data[index]}
-            getItemCount={data => data.length}
+            getItemCount={(data) => data.length}
             ref={listRef}
           />
         )}
         getItem={(data, index) => data[index]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     const scrollRef = listRef.current.getScrollRef();
@@ -349,7 +349,7 @@ describe('VirtualizedList', () => {
       windowSize: 21,
       renderItem: ({item}) => <item value={item.key} />,
       getItem: (items, index) => items[index],
-      getItemCount: items => items.length,
+      getItemCount: (items) => items.length,
       getItemLayout: (items, index) => ({
         length: ITEM_HEIGHT,
         offset: ITEM_HEIGHT * index,
@@ -401,7 +401,7 @@ describe('VirtualizedList', () => {
     const commonProps = {
       data: [{key: 'cell0'}],
       getItem: (data, index) => data[index],
-      getItemCount: data => data.length,
+      getItemCount: (data) => data.length,
       renderItem: ({item}) => <item value={item.key} />,
     };
     try {
diff --git a/Libraries/Lists/__tests__/VirtualizedSectionList-test.js b/Libraries/Lists/__tests__/VirtualizedSectionList-test.js
index 9bb461bf973..6e64d53b4c4 100644
--- a/Libraries/Lists/__tests__/VirtualizedSectionList-test.js
+++ b/Libraries/Lists/__tests__/VirtualizedSectionList-test.js
@@ -24,7 +24,7 @@ describe('VirtualizedSectionList', () => {
         ]}
         renderItem={({item}) => <item value={item.key} />}
         getItem={(data, key) => data[key]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -36,7 +36,7 @@ describe('VirtualizedSectionList', () => {
         sections={[]}
         renderItem={({item}) => <item value={item.key} />}
         getItem={(data, key) => data[key]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -48,7 +48,7 @@ describe('VirtualizedSectionList', () => {
         sections={undefined}
         renderItem={({item}) => <item value={item.key} />}
         getItem={(data, key) => data[key]}
-        getItemCount={data => 0}
+        getItemCount={(data) => 0}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -62,7 +62,7 @@ describe('VirtualizedSectionList', () => {
         ListFooterComponent={() => <footer />}
         ListHeaderComponent={() => <header />}
         getItem={(data, key) => data[key]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
         renderItem={({item}) => <item value={item.key} />}
       />,
     );
@@ -75,7 +75,7 @@ describe('VirtualizedSectionList', () => {
         sections={[{title: 's1', data: [{key: 'hello'}]}]}
         ListEmptyComponent={() => <empty />}
         getItem={(data, key) => data[key]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
         renderItem={({item}) => <item value={item.key} />}
       />,
     );
@@ -96,7 +96,7 @@ describe('VirtualizedSectionList', () => {
           },
         ]}
         getItem={(data, key) => data[key]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
         getItemLayout={({index}) => ({length: 50, offset: index * 50})}
         inverted={true}
         keyExtractor={(item, index) => item.id}
@@ -112,16 +112,16 @@ describe('VirtualizedSectionList', () => {
     const infos = [];
     const component = ReactTestRenderer.create(
       <VirtualizedSectionList
-        ItemSeparatorComponent={props => <separator {...props} />}
+        ItemSeparatorComponent={(props) => <separator {...props} />}
         sections={[
           {title: 's0', data: [{key: 'i0'}, {key: 'i1'}, {key: 'i2'}]},
         ]}
-        renderItem={info => {
+        renderItem={(info) => {
           infos.push(info);
           return <item title={info.item.key} />;
         }}
         getItem={(data, key) => data[key]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -136,7 +136,7 @@ describe('VirtualizedSectionList', () => {
     const component = ReactTestRenderer.create(
       <VirtualizedSectionList
         sections={[{title: 'outer', data: [{key: 'outer0'}, {key: 'outer1'}]}]}
-        renderItem={outerInfo => (
+        renderItem={(outerInfo) => (
           <VirtualizedSectionList
             sections={[
               {
@@ -148,15 +148,15 @@ describe('VirtualizedSectionList', () => {
               },
             ]}
             horizontal={outerInfo.item.key === 'outer1'}
-            renderItem={innerInfo => {
+            renderItem={(innerInfo) => {
               return <item title={innerInfo.item.key} />;
             }}
             getItem={(data, key) => data[key]}
-            getItemCount={data => data.length}
+            getItemCount={(data) => data.length}
           />
         )}
         getItem={(data, key) => data[key]}
-        getItemCount={data => data.length}
+        getItemCount={(data) => data.length}
       />,
     );
     expect(component).toMatchSnapshot();
@@ -165,7 +165,7 @@ describe('VirtualizedSectionList', () => {
   describe('scrollToLocation', () => {
     const ITEM_HEIGHT = 100;
 
-    const createVirtualizedSectionList = props => {
+    const createVirtualizedSectionList = (props) => {
       const component = ReactTestRenderer.create(
         <VirtualizedSectionList
           sections={[
@@ -174,7 +174,7 @@ describe('VirtualizedSectionList', () => {
           ]}
           renderItem={({item}) => <item value={item.key} />}
           getItem={(data, key) => data[key]}
-          getItemCount={data => data.length}
+          getItemCount={(data) => data.length}
           getItemLayout={(data, index) => ({
             length: ITEM_HEIGHT,
             offset: ITEM_HEIGHT * index,
diff --git a/Libraries/LogBox/Data/LogBoxData.js b/Libraries/LogBox/Data/LogBoxData.js
index 1076d26661f..033ffe4ca35 100644
--- a/Libraries/LogBox/Data/LogBoxData.js
+++ b/Libraries/LogBox/Data/LogBoxData.js
@@ -71,7 +71,7 @@ let updateTimeout = null;
 let _isDisabled = false;
 let _selectedIndex = -1;
 
-let warningFilter: WarningFilter = function(format) {
+let warningFilter: WarningFilter = function (format) {
   return {
     finalFormat: format,
     forceDialogImmediately: false,
@@ -175,7 +175,7 @@ function appendNewLog(newLog) {
       }
     }, OPTIMISTIC_WAIT_TIME);
 
-    newLog.symbolicate(status => {
+    newLog.symbolicate((status) => {
       if (addPendingLog && status !== 'PENDING') {
         addPendingLog();
         clearTimeout(optimisticTimeout);
@@ -282,7 +282,7 @@ export function setSelectedLog(proposedNewIndex: number): void {
 }
 
 export function clearWarnings(): void {
-  const newLogs = Array.from(logs).filter(log => log.level !== 'warn');
+  const newLogs = Array.from(logs).filter((log) => log.level !== 'warn');
   if (newLogs.length !== logs.size) {
     logs = new Set(newLogs);
     setSelectedLog(-1);
@@ -292,7 +292,7 @@ export function clearWarnings(): void {
 
 export function clearErrors(): void {
   const newLogs = Array.from(logs).filter(
-    log => log.level !== 'error' && log.level !== 'fatal',
+    (log) => log.level !== 'error' && log.level !== 'fatal',
   );
   if (newLogs.length !== logs.size) {
     logs = new Set(newLogs);
@@ -354,7 +354,7 @@ export function addIgnorePatterns(
     // Without this, if you ignore a pattern after the a log is created,
     // then we would keep showing the log.
     logs = new Set(
-      Array.from(logs).filter(log => !isMessageIgnored(log.message.content)),
+      Array.from(logs).filter((log) => !isMessageIgnored(log.message.content)),
     );
   }
   handleUpdate();
@@ -439,7 +439,7 @@ export function withSubscription(
     }
 
     componentDidMount(): void {
-      this._subscription = observe(data => {
+      this._subscription = observe((data) => {
         this.setState(data);
       });
     }
diff --git a/Libraries/LogBox/Data/LogBoxLog.js b/Libraries/LogBox/Data/LogBoxLog.js
index 2d019518306..13bfaf73d5e 100644
--- a/Libraries/LogBox/Data/LogBoxLog.js
+++ b/Libraries/LogBox/Data/LogBoxLog.js
@@ -94,10 +94,10 @@ class LogBoxLog {
     if (this.symbolicated.status !== 'PENDING') {
       this.updateStatus(null, null, null, callback);
       LogBoxSymbolication.symbolicate(this.stack).then(
-        data => {
+        (data) => {
           this.updateStatus(null, data?.stack, data?.codeFrame, callback);
         },
-        error => {
+        (error) => {
           this.updateStatus(error, null, null, callback);
         },
       );
diff --git a/Libraries/LogBox/Data/__tests__/LogBoxData-test.js b/Libraries/LogBox/Data/__tests__/LogBoxData-test.js
index bd5e0c99056..ff5ad880708 100644
--- a/Libraries/LogBox/Data/__tests__/LogBoxData-test.js
+++ b/Libraries/LogBox/Data/__tests__/LogBoxData-test.js
@@ -51,8 +51,8 @@ const observe = () => {
   };
 };
 
-const addLogs = logs => {
-  logs.forEach(message => {
+const addLogs = (logs) => {
+  logs.forEach((message) => {
     LogBoxData.addLog({
       level: 'warn',
       message: {
@@ -65,8 +65,8 @@ const addLogs = logs => {
   });
 };
 
-const addSoftErrors = errors => {
-  errors.forEach(error => {
+const addSoftErrors = (errors) => {
+  errors.forEach((error) => {
     LogBoxData.addException(
       Object.assign(
         {},
@@ -88,8 +88,8 @@ const addSoftErrors = errors => {
   });
 };
 
-const addFatalErrors = errors => {
-  errors.forEach(error => {
+const addFatalErrors = (errors) => {
+  errors.forEach((error) => {
     LogBoxData.addException(
       Object.assign(
         {},
diff --git a/Libraries/LogBox/Data/__tests__/LogBoxLog-test.js b/Libraries/LogBox/Data/__tests__/LogBoxLog-test.js
index c08d16786d1..4ec8c844916 100644
--- a/Libraries/LogBox/Data/__tests__/LogBoxLog-test.js
+++ b/Libraries/LogBox/Data/__tests__/LogBoxLog-test.js
@@ -19,7 +19,7 @@ jest.mock('../LogBoxSymbolication', () => {
 });
 
 function getLogBoxLog() {
-  return new (require('../LogBoxLog')).default({
+  return new (require('../LogBoxLog').default)({
     level: 'warn',
     isComponentError: false,
     message: {content: '...', substitutions: []},
@@ -49,8 +49,8 @@ function getLogBoxSymbolication(): {|
   return (require('../LogBoxSymbolication'): any);
 }
 
-const createStack = methodNames =>
-  methodNames.map(methodName => ({
+const createStack = (methodNames) =>
+  methodNames.map((methodName) => ({
     column: null,
     file: 'file://path/to/file.js',
     lineNumber: 1,
@@ -61,8 +61,8 @@ describe('LogBoxLog', () => {
   beforeEach(() => {
     jest.resetModules();
 
-    getLogBoxSymbolication().symbolicate.mockImplementation(async stack => ({
-      stack: createStack(stack.map(frame => `S(${frame.methodName})`)),
+    getLogBoxSymbolication().symbolicate.mockImplementation(async (stack) => ({
+      stack: createStack(stack.map((frame) => `S(${frame.methodName})`)),
       codeFrame: null,
     }));
   });
@@ -164,7 +164,7 @@ describe('LogBoxLog', () => {
 
   it('updates when symbolication fails', () => {
     const error = new Error('...');
-    getLogBoxSymbolication().symbolicate.mockImplementation(async stack => {
+    getLogBoxSymbolication().symbolicate.mockImplementation(async (stack) => {
       throw error;
     });
 
@@ -253,7 +253,7 @@ describe('LogBoxLog', () => {
 
   it('retry updates when symbolication fails', () => {
     const error = new Error('...');
-    getLogBoxSymbolication().symbolicate.mockImplementation(async stack => {
+    getLogBoxSymbolication().symbolicate.mockImplementation(async (stack) => {
       throw error;
     });
 
@@ -278,8 +278,8 @@ describe('LogBoxLog', () => {
     // Retry to symbolicate again.
     callback.mockClear();
     getLogBoxSymbolication().symbolicate.mockClear();
-    getLogBoxSymbolication().symbolicate.mockImplementation(async stack => ({
-      stack: createStack(stack.map(frame => `S(${frame.methodName})`)),
+    getLogBoxSymbolication().symbolicate.mockImplementation(async (stack) => ({
+      stack: createStack(stack.map((frame) => `S(${frame.methodName})`)),
       codeFrame: null,
     }));
 
diff --git a/Libraries/LogBox/Data/__tests__/LogBoxSymbolication-test.js b/Libraries/LogBox/Data/__tests__/LogBoxSymbolication-test.js
index 36dca4a6818..9f592fc33bf 100644
--- a/Libraries/LogBox/Data/__tests__/LogBoxSymbolication-test.js
+++ b/Libraries/LogBox/Data/__tests__/LogBoxSymbolication-test.js
@@ -22,8 +22,8 @@ const symbolicateStackTrace: JestMockFn<
   Promise<Array<StackFrame>>,
 > = (require('../../../Core/Devtools/symbolicateStackTrace'): any);
 
-const createStack = methodNames =>
-  methodNames.map(methodName => ({
+const createStack = (methodNames) =>
+  methodNames.map((methodName) => ({
     column: null,
     file: 'file://path/to/file.js',
     lineNumber: 1,
@@ -33,7 +33,7 @@ const createStack = methodNames =>
 describe('LogBoxSymbolication', () => {
   beforeEach(() => {
     jest.resetModules();
-    symbolicateStackTrace.mockImplementation(async stack => stack);
+    symbolicateStackTrace.mockImplementation(async (stack) => stack);
   });
 
   it('symbolicates different stacks', () => {
diff --git a/Libraries/LogBox/Data/parseLogBoxLog.js b/Libraries/LogBox/Data/parseLogBoxLog.js
index cdc72a6f79e..6328edaa862 100644
--- a/Libraries/LogBox/Data/parseLogBoxLog.js
+++ b/Libraries/LogBox/Data/parseLogBoxLog.js
@@ -106,7 +106,7 @@ export function parseInterpolation(
     contentParts.push(contentString);
   }
 
-  const remainingArgs = remaining.map(arg => {
+  const remainingArgs = remaining.map((arg) => {
     // Don't stringify a string type.
     // It adds quotation mark wrappers around the string,
     // which causes the LogBox to look odd.
@@ -127,7 +127,7 @@ export function parseInterpolation(
 export function parseComponentStack(message: string): ComponentStack {
   return message
     .split(/\n {4}in /g)
-    .map(s => {
+    .map((s) => {
       if (!s) {
         return null;
       }
diff --git a/Libraries/LogBox/LogBox.js b/Libraries/LogBox/LogBox.js
index eb00b87930c..ea53ac94d29 100644
--- a/Libraries/LogBox/LogBox.js
+++ b/Libraries/LogBox/LogBox.js
@@ -29,10 +29,10 @@ if (__DEV__) {
   let errorImpl = error.bind(console);
   let warnImpl = warn.bind(console);
 
-  (console: any).error = function(...args) {
+  (console: any).error = function (...args) {
     errorImpl(...args);
   };
-  (console: any).warn = function(...args) {
+  (console: any).warn = function (...args) {
     warnImpl(...args);
   };
 
@@ -55,11 +55,11 @@ if (__DEV__) {
       // Trigger lazy initialization of module.
       require('../NativeModules/specs/NativeLogBox');
 
-      errorImpl = function(...args) {
+      errorImpl = function (...args) {
         registerError(...args);
       };
 
-      warnImpl = function(...args) {
+      warnImpl = function (...args) {
         registerWarning(...args);
       };
 
@@ -73,7 +73,7 @@ if (__DEV__) {
       (Object.defineProperty: any)(console, 'disableYellowBox', {
         configurable: true,
         get: () => LogBoxData.isDisabled(),
-        set: value => {
+        set: (value) => {
           LogBoxData.setDisabled(value);
           console.warn(
             'console.disableYellowBox has been deprecated and will be removed in a future release. Please use LogBox.ignoreAllLogs(value) instead.',
diff --git a/Libraries/LogBox/LogBoxNotificationContainer.js b/Libraries/LogBox/LogBoxNotificationContainer.js
index bc5237560a4..0277c009a93 100644
--- a/Libraries/LogBox/LogBoxNotificationContainer.js
+++ b/Libraries/LogBox/LogBoxNotificationContainer.js
@@ -51,9 +51,9 @@ export function _LogBoxNotificationContainer(props: Props): React.Node {
     return null;
   }
 
-  const warnings = logs.filter(log => log.level === 'warn');
+  const warnings = logs.filter((log) => log.level === 'warn');
   const errors = logs.filter(
-    log => log.level === 'error' || log.level === 'fatal',
+    (log) => log.level === 'error' || log.level === 'fatal',
   );
   return (
     <View style={styles.list}>
diff --git a/Libraries/LogBox/UI/AnsiHighlight.js b/Libraries/LogBox/UI/AnsiHighlight.js
index 101b1425826..3677652b64f 100644
--- a/Libraries/LogBox/UI/AnsiHighlight.js
+++ b/Libraries/LogBox/UI/AnsiHighlight.js
@@ -45,7 +45,7 @@ export default function Ansi({
   ...
 }): React.Node {
   let commonWhitespaceLength = Infinity;
-  const parsedLines = text.split(/\n/).map(line =>
+  const parsedLines = text.split(/\n/).map((line) =>
     ansiToJson(line, {
       json: true,
       remove_empty: true,
@@ -53,7 +53,7 @@ export default function Ansi({
     }),
   );
 
-  parsedLines.map(lines => {
+  parsedLines.map((lines) => {
     // The third item on each line includes the whitespace of the source code.
     // We are looking for the least amount of common whitespace to trim all lines.
     // Example: Array [" ", " 96 |", "     text", ...]
diff --git a/Libraries/LogBox/UI/LogBoxMessage.js b/Libraries/LogBox/UI/LogBoxMessage.js
index dd300c12a02..dba687869e4 100644
--- a/Libraries/LogBox/UI/LogBoxMessage.js
+++ b/Libraries/LogBox/UI/LogBoxMessage.js
@@ -24,7 +24,7 @@ type Props = {
   ...
 };
 
-const cleanContent = content =>
+const cleanContent = (content) =>
   content.replace(/^(TransformError |Warning: (Warning: )?|Error: )/g, '');
 
 function LogBoxMessage(props: Props): React.Node {
diff --git a/Libraries/LogBox/UI/__tests__/LogBoxInspectorStackFrames-test.js b/Libraries/LogBox/UI/__tests__/LogBoxInspectorStackFrames-test.js
index 96e4f3e88e2..0aa2d577e1e 100644
--- a/Libraries/LogBox/UI/__tests__/LogBoxInspectorStackFrames-test.js
+++ b/Libraries/LogBox/UI/__tests__/LogBoxInspectorStackFrames-test.js
@@ -20,7 +20,7 @@ const {} = require('../LogBoxInspectorStackFrames');
 const LogBoxLog = require('../../Data/LogBoxLog').default;
 const render = require('../../../../jest/renderer');
 
-const createLogWithFrames = collapsedOptions => {
+const createLogWithFrames = (collapsedOptions) => {
   return new LogBoxLog({
     level: 'warn',
     isComponentError: false,
@@ -34,8 +34,8 @@ const createLogWithFrames = collapsedOptions => {
   });
 };
 
-const createCollapsedFrames = collapsedOptions => {
-  return collapsedOptions.map(option => ({
+const createCollapsedFrames = (collapsedOptions) => {
+  return collapsedOptions.map((option) => ({
     column: 1,
     file: 'dependency.js',
     lineNumber: 1,
@@ -85,7 +85,7 @@ describe('LogBoxInspectorStackFrame', () => {
       expect(
         getCollapseMessage(
           createCollapsedFrames(
-            [stackOne, stackTwo, stackThree].filter(i => i != null),
+            [stackOne, stackTwo, stackThree].filter((i) => i != null),
           ),
           collapsed,
         ),
diff --git a/Libraries/Modal/Modal.js b/Libraries/Modal/Modal.js
index 71293402c36..ba842b17464 100644
--- a/Libraries/Modal/Modal.js
+++ b/Libraries/Modal/Modal.js
@@ -190,9 +190,7 @@ class Modal extends React.Component<Props> {
       props.transparent
     ) {
       console.warn(
-        `Modal with '${
-          props.presentationStyle
-        }' presentation style and 'transparent' value is not supported.`,
+        `Modal with '${props.presentationStyle}' presentation style and 'transparent' value is not supported.`,
       );
     }
   }
diff --git a/Libraries/Network/RCTNetworking.android.js b/Libraries/Network/RCTNetworking.android.js
index b1577a078fc..4dab4cacc46 100644
--- a/Libraries/Network/RCTNetworking.android.js
+++ b/Libraries/Network/RCTNetworking.android.js
@@ -59,7 +59,7 @@ class RCTNetworking extends NativeEventEmitter {
   ) {
     const body = convertRequestBody(data);
     if (body && body.formData) {
-      body.formData = body.formData.map(part => ({
+      body.formData = body.formData.map((part) => ({
         ...part,
         headers: convertHeadersMapToArray(part.headers),
       }));
diff --git a/Libraries/Network/XHRInterceptor.js b/Libraries/Network/XHRInterceptor.js
index 65c32e5606d..9886f621f7d 100644
--- a/Libraries/Network/XHRInterceptor.js
+++ b/Libraries/Network/XHRInterceptor.js
@@ -75,7 +75,7 @@ const XHRInterceptor = {
     }
     // Override `open` method for all XHR requests to intercept the request
     // method and url, then pass them through the `openCallback`.
-    XMLHttpRequest.prototype.open = function(method, url) {
+    XMLHttpRequest.prototype.open = function (method, url) {
       if (openCallback) {
         openCallback(method, url, this);
       }
@@ -84,7 +84,7 @@ const XHRInterceptor = {
 
     // Override `setRequestHeader` method for all XHR requests to intercept
     // the request headers, then pass them through the `requestHeaderCallback`.
-    XMLHttpRequest.prototype.setRequestHeader = function(header, value) {
+    XMLHttpRequest.prototype.setRequestHeader = function (header, value) {
       if (requestHeaderCallback) {
         requestHeaderCallback(header, value, this);
       }
@@ -93,7 +93,7 @@ const XHRInterceptor = {
 
     // Override `send` method of all XHR requests to intercept the data sent,
     // register listeners to intercept the response, and invoke the callbacks.
-    XMLHttpRequest.prototype.send = function(data) {
+    XMLHttpRequest.prototype.send = function (data) {
       if (sendCallback) {
         sendCallback(data, this);
       }
diff --git a/Libraries/Network/XMLHttpRequest.js b/Libraries/Network/XMLHttpRequest.js
index 7bfb0ffa358..0e6c8b51fb5 100644
--- a/Libraries/Network/XMLHttpRequest.js
+++ b/Libraries/Network/XMLHttpRequest.js
@@ -408,7 +408,7 @@ class XMLHttpRequest extends (EventTarget(...XHR_EVENTS): any) {
   }
 
   _clearSubscriptions(): void {
-    (this._subscriptions || []).forEach(sub => {
+    (this._subscriptions || []).forEach((sub) => {
       if (sub) {
         sub.remove();
       }
@@ -423,7 +423,7 @@ class XMLHttpRequest extends (EventTarget(...XHR_EVENTS): any) {
     }
     const headers = this.responseHeaders || {};
     return Object.keys(headers)
-      .map(headerName => {
+      .map((headerName) => {
         return headerName + ': ' + headers[headerName];
       })
       .join('\r\n');
@@ -479,32 +479,32 @@ class XMLHttpRequest extends (EventTarget(...XHR_EVENTS): any) {
       this._incrementalEvents || !!this.onreadystatechange || !!this.onprogress;
 
     this._subscriptions.push(
-      RCTNetworking.addListener('didSendNetworkData', args =>
+      RCTNetworking.addListener('didSendNetworkData', (args) =>
         this.__didUploadProgress(...args),
       ),
     );
     this._subscriptions.push(
-      RCTNetworking.addListener('didReceiveNetworkResponse', args =>
+      RCTNetworking.addListener('didReceiveNetworkResponse', (args) =>
         this.__didReceiveResponse(...args),
       ),
     );
     this._subscriptions.push(
-      RCTNetworking.addListener('didReceiveNetworkData', args =>
+      RCTNetworking.addListener('didReceiveNetworkData', (args) =>
         this.__didReceiveData(...args),
       ),
     );
     this._subscriptions.push(
-      RCTNetworking.addListener('didReceiveNetworkIncrementalData', args =>
+      RCTNetworking.addListener('didReceiveNetworkIncrementalData', (args) =>
         this.__didReceiveIncrementalData(...args),
       ),
     );
     this._subscriptions.push(
-      RCTNetworking.addListener('didReceiveNetworkDataProgress', args =>
+      RCTNetworking.addListener('didReceiveNetworkDataProgress', (args) =>
         this.__didReceiveDataProgress(...args),
       ),
     );
     this._subscriptions.push(
-      RCTNetworking.addListener('didCompleteNetworkResponse', args =>
+      RCTNetworking.addListener('didCompleteNetworkResponse', (args) =>
         this.__didCompleteResponse(...args),
       ),
     );
diff --git a/Libraries/Network/__tests__/FormData-test.js b/Libraries/Network/__tests__/FormData-test.js
index 5ea0263aac3..b93b8a53342 100644
--- a/Libraries/Network/__tests__/FormData-test.js
+++ b/Libraries/Network/__tests__/FormData-test.js
@@ -12,7 +12,7 @@
 
 const FormData = require('../FormData');
 
-describe('FormData', function() {
+describe('FormData', function () {
   var formData;
 
   beforeEach(() => {
@@ -23,7 +23,7 @@ describe('FormData', function() {
     formData = null;
   });
 
-  it('should return non blob null', function() {
+  it('should return non blob null', function () {
     formData.append('null', null);
 
     const expectedPart = {
@@ -36,7 +36,7 @@ describe('FormData', function() {
     expect(formData.getParts()[0]).toMatchObject(expectedPart);
   });
 
-  it('should return blob', function() {
+  it('should return blob', function () {
     formData.append('photo', {
       uri: 'arbitrary/path',
       type: 'image/jpeg',
diff --git a/Libraries/Network/__tests__/XMLHttpRequest-test.js b/Libraries/Network/__tests__/XMLHttpRequest-test.js
index 4c0f8a88917..98efe37660e 100644
--- a/Libraries/Network/__tests__/XMLHttpRequest-test.js
+++ b/Libraries/Network/__tests__/XMLHttpRequest-test.js
@@ -24,15 +24,15 @@ jest
   .dontMock('event-target-shim')
   .setMock('../../BatchedBridge/NativeModules', {
     Networking: {
-      addListener: function() {},
-      removeListeners: function() {},
+      addListener: function () {},
+      removeListeners: function () {},
       sendRequest(options, callback) {
         if (typeof callback === 'function') {
           // android does not pass a callback
           callback(requestId);
         }
       },
-      abortRequest: function() {},
+      abortRequest: function () {},
     },
     PlatformConstants: {
       getConstants() {
@@ -43,7 +43,7 @@ jest
 
 const XMLHttpRequest = require('../XMLHttpRequest');
 
-describe('XMLHttpRequest', function() {
+describe('XMLHttpRequest', function () {
   let xhr;
   let handleTimeout;
   let handleError;
@@ -82,7 +82,7 @@ describe('XMLHttpRequest', function() {
     handleReadyStateChange = null;
   });
 
-  it('should transition readyState correctly', function() {
+  it('should transition readyState correctly', function () {
     expect(xhr.readyState).toBe(xhr.UNSENT);
 
     xhr.open('GET', 'blabla');
@@ -92,7 +92,7 @@ describe('XMLHttpRequest', function() {
     expect(xhr.readyState).toBe(xhr.OPENED);
   });
 
-  it('should expose responseType correctly', function() {
+  it('should expose responseType correctly', function () {
     expect(xhr.responseType).toBe('');
 
     jest.spyOn(console, 'error').mockImplementationOnce(() => {});
@@ -117,7 +117,7 @@ describe('XMLHttpRequest', function() {
     }).toThrow();
   });
 
-  it('should expose responseText correctly', function() {
+  it('should expose responseText correctly', function () {
     xhr.responseType = '';
     expect(xhr.responseText).toBe('');
     expect(xhr.response).toBe('');
@@ -144,7 +144,7 @@ describe('XMLHttpRequest', function() {
     expect(xhr.responseText).toBe('Some data');
   });
 
-  it('should call ontimeout function when the request times out', function() {
+  it('should call ontimeout function when the request times out', function () {
     xhr.open('GET', 'blabla');
     xhr.send();
     setRequestId(3);
@@ -164,7 +164,7 @@ describe('XMLHttpRequest', function() {
     expect(handleLoad).not.toBeCalled();
   });
 
-  it('should call onerror function when the request times out', function() {
+  it('should call onerror function when the request times out', function () {
     xhr.open('GET', 'blabla');
     xhr.send();
     setRequestId(4);
@@ -185,7 +185,7 @@ describe('XMLHttpRequest', function() {
     expect(handleLoad).not.toBeCalled();
   });
 
-  it('should call onload function when there is no error', function() {
+  it('should call onload function when there is no error', function () {
     xhr.open('GET', 'blabla');
     xhr.send();
     setRequestId(5);
@@ -206,7 +206,7 @@ describe('XMLHttpRequest', function() {
     expect(handleTimeout).not.toBeCalled();
   });
 
-  it('should call upload onprogress', function() {
+  it('should call upload onprogress', function () {
     xhr.open('GET', 'blabla');
     xhr.send();
 
@@ -225,7 +225,7 @@ describe('XMLHttpRequest', function() {
     expect(handleProgress.mock.calls[0][0].total).toBe(100);
   });
 
-  it('should combine response headers with CRLF', function() {
+  it('should combine response headers with CRLF', function () {
     xhr.open('GET', 'blabla');
     xhr.send();
     setRequestId(7);
diff --git a/Libraries/Performance/PureComponentDebug.js b/Libraries/Performance/PureComponentDebug.js
index 982ed49353c..a479261fc65 100644
--- a/Libraries/Performance/PureComponentDebug.js
+++ b/Libraries/Performance/PureComponentDebug.js
@@ -39,8 +39,8 @@ class PureComponentDebug<
       console.warn(
         'PureComponentDebug: different prop keys',
         tag,
-        prevPropsKeys.filter(key => !nextPropsKeys.includes(key)),
-        nextPropsKeys.filter(key => !prevPropsKeys.includes(key)),
+        prevPropsKeys.filter((key) => !nextPropsKeys.includes(key)),
+        nextPropsKeys.filter((key) => !prevPropsKeys.includes(key)),
       );
     }
     const prevStateKeys = Object.keys(this.state || {});
@@ -50,8 +50,8 @@ class PureComponentDebug<
       console.warn(
         'PureComponentDebug: different state keys',
         tag,
-        prevStateKeys.filter(key => !nextStateKeys.includes(key)),
-        nextStateKeys.filter(key => !prevStateKeys.includes(key)),
+        prevStateKeys.filter((key) => !nextStateKeys.includes(key)),
+        nextStateKeys.filter((key) => !prevStateKeys.includes(key)),
       );
     }
     for (const key in this.props) {
diff --git a/Libraries/Performance/SamplingProfiler.js b/Libraries/Performance/SamplingProfiler.js
index 2808f83ebdd..eb20cd3d7b8 100644
--- a/Libraries/Performance/SamplingProfiler.js
+++ b/Libraries/Performance/SamplingProfiler.js
@@ -11,7 +11,7 @@
 'use strict';
 
 const SamplingProfiler = {
-  poke: function(token: number): void {
+  poke: function (token: number): void {
     let error = null;
     let result = null;
     try {
diff --git a/Libraries/Pressability/Pressability.js b/Libraries/Pressability/Pressability.js
index 6a078eda849..c696a7af1bb 100644
--- a/Libraries/Pressability/Pressability.js
+++ b/Libraries/Pressability/Pressability.js
@@ -255,20 +255,20 @@ const Transitions = Object.freeze({
   },
 });
 
-const isActiveSignal = signal =>
+const isActiveSignal = (signal) =>
   signal === 'RESPONDER_ACTIVE_PRESS_IN' ||
   signal === 'RESPONDER_ACTIVE_LONG_PRESS_IN';
 
-const isActivationSignal = signal =>
+const isActivationSignal = (signal) =>
   signal === 'RESPONDER_ACTIVE_PRESS_OUT' ||
   signal === 'RESPONDER_ACTIVE_PRESS_IN';
 
-const isPressInSignal = signal =>
+const isPressInSignal = (signal) =>
   signal === 'RESPONDER_INACTIVE_PRESS_IN' ||
   signal === 'RESPONDER_ACTIVE_PRESS_IN' ||
   signal === 'RESPONDER_ACTIVE_LONG_PRESS_IN';
 
-const isTerminalSignal = signal =>
+const isTerminalSignal = (signal) =>
   signal === 'RESPONDER_TERMINATED' || signal === 'RESPONDER_RELEASE';
 
 const DEFAULT_LONG_PRESS_DELAY_MS = 370; // 500 - 130
diff --git a/Libraries/Pressability/__tests__/Pressability-test.js b/Libraries/Pressability/__tests__/Pressability-test.js
index e523df9ceab..586462172c9 100644
--- a/Libraries/Pressability/__tests__/Pressability-test.js
+++ b/Libraries/Pressability/__tests__/Pressability-test.js
@@ -29,7 +29,7 @@ function getMock<TArguments: $ReadOnlyArray<mixed>, TReturn>(
   return (fn: $FlowFixMe);
 }
 
-const createMockPressability = overrides => {
+const createMockPressability = (overrides) => {
   const config = {
     cancelable: null,
     disabled: null,
@@ -106,7 +106,7 @@ const mockUIManagerMeasure = (options?: {|delay: number|}) => {
   });
 };
 
-const createMockTargetEvent = registrationName => {
+const createMockTargetEvent = (registrationName) => {
   const nativeEvent = {
     target: 42,
   };
@@ -133,7 +133,7 @@ const createMockTargetEvent = registrationName => {
   };
 };
 
-const createMockMouseEvent = registrationName => {
+const createMockMouseEvent = (registrationName) => {
   const nativeEvent = {
     clientX: 0,
     clientY: 0,
diff --git a/Libraries/Promise.js b/Libraries/Promise.js
index 292bc270744..a314b8ade14 100644
--- a/Libraries/Promise.js
+++ b/Libraries/Promise.js
@@ -40,7 +40,7 @@ if (__DEV__) {
         (stack == null ? '' : stack);
       console.warn(warning);
     },
-    onHandled: id => {
+    onHandled: (id) => {
       const warning =
         `Promise Rejection Handled (id: ${id})\n` +
         'This means you can ignore any previous messages of the form ' +
diff --git a/Libraries/PushNotificationIOS/PushNotificationIOS.js b/Libraries/PushNotificationIOS/PushNotificationIOS.js
index 73c184e749e..417e15c1b21 100644
--- a/Libraries/PushNotificationIOS/PushNotificationIOS.js
+++ b/Libraries/PushNotificationIOS/PushNotificationIOS.js
@@ -237,28 +237,28 @@ class PushNotificationIOS {
     if (type === 'notification') {
       listener = PushNotificationEmitter.addListener(
         DEVICE_NOTIF_EVENT,
-        notifData => {
+        (notifData) => {
           handler(new PushNotificationIOS(notifData));
         },
       );
     } else if (type === 'localNotification') {
       listener = PushNotificationEmitter.addListener(
         DEVICE_LOCAL_NOTIF_EVENT,
-        notifData => {
+        (notifData) => {
           handler(new PushNotificationIOS(notifData));
         },
       );
     } else if (type === 'register') {
       listener = PushNotificationEmitter.addListener(
         NOTIF_REGISTER_EVENT,
-        registrationInfo => {
+        (registrationInfo) => {
           handler(registrationInfo.deviceToken);
         },
       );
     } else if (type === 'registrationError') {
       listener = PushNotificationEmitter.addListener(
         NOTIF_REGISTRATION_ERROR_EVENT,
-        errorInfo => {
+        (errorInfo) => {
           handler(errorInfo);
         },
       );
@@ -371,7 +371,7 @@ class PushNotificationIOS {
       'PushNotificationManager is not available.',
     );
     return NativePushNotificationManagerIOS.getInitialNotification().then(
-      notification => {
+      (notification) => {
         return notification && new PushNotificationIOS(notification);
       },
     );
@@ -394,7 +394,7 @@ class PushNotificationIOS {
     if (nativeNotif.remote) {
       // Extract data from Apple's `aps` dict as defined:
       // https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/ApplePushService.html
-      Object.keys(nativeNotif).forEach(notifKey => {
+      Object.keys(nativeNotif).forEach((notifKey) => {
         const notifVal = nativeNotif[notifKey];
         if (notifKey === 'aps') {
           this._alert = notifVal.alert;
diff --git a/Libraries/ReactNative/AppContainer.js b/Libraries/ReactNative/AppContainer.js
index e7772fc14fd..80fe4aa1cde 100644
--- a/Libraries/ReactNative/AppContainer.js
+++ b/Libraries/ReactNative/AppContainer.js
@@ -69,9 +69,9 @@ class AppContainer extends React.Component<Props, State> {
               <Inspector
                 isFabric={this.props.fabric === true}
                 inspectedView={this._mainRef}
-                onRequestRerenderApp={updateInspectedView => {
+                onRequestRerenderApp={(updateInspectedView) => {
                   this.setState(
-                    s => ({mainKey: s.mainKey + 1}),
+                    (s) => ({mainKey: s.mainKey + 1}),
                     () => updateInspectedView(this._mainRef),
                   );
                 }}
@@ -109,7 +109,7 @@ class AppContainer extends React.Component<Props, State> {
         key={this.state.mainKey}
         pointerEvents="box-none"
         style={styles.appContainer}
-        ref={ref => {
+        ref={(ref) => {
           this._mainRef = ref;
         }}>
         {this.props.children}
diff --git a/Libraries/ReactNative/AppRegistry.js b/Libraries/ReactNative/AppRegistry.js
index 99abee3e0d7..396d20a99f5 100644
--- a/Libraries/ReactNative/AppRegistry.js
+++ b/Libraries/ReactNative/AppRegistry.js
@@ -52,7 +52,7 @@ export type Registry = {
   runnables: Runnables,
   ...
 };
-export type WrapperComponentProvider = any => React$ComponentType<*>;
+export type WrapperComponentProvider = (any) => React$ComponentType<*>;
 
 const runnables: Runnables = {};
 let runCount = 1;
@@ -81,7 +81,7 @@ const AppRegistry = {
   },
 
   registerConfig(config: Array<AppConfig>): void {
-    config.forEach(appConfig => {
+    config.forEach((appConfig) => {
       if (appConfig.run) {
         AppRegistry.registerRunnable(appConfig.appKey, appConfig.run);
       } else {
@@ -113,7 +113,7 @@ const AppRegistry = {
     let scopedPerformanceLogger = createPerformanceLogger();
     runnables[appKey] = {
       componentProvider,
-      run: appParameters => {
+      run: (appParameters) => {
         renderApplication(
           componentProviderInstrumentationHook(
             componentProvider,
@@ -261,7 +261,7 @@ const AppRegistry = {
           NativeHeadlessJsTaskSupport.notifyTaskFinished(taskId);
         }
       })
-      .catch(reason => {
+      .catch((reason) => {
         console.error(reason);
 
         if (
@@ -269,7 +269,7 @@ const AppRegistry = {
           reason instanceof HeadlessJsTaskError
         ) {
           NativeHeadlessJsTaskSupport.notifyTaskRetry(taskId).then(
-            retryPosted => {
+            (retryPosted) => {
               if (!retryPosted) {
                 NativeHeadlessJsTaskSupport.notifyTaskFinished(taskId);
               }
diff --git a/Libraries/ReactNative/PaperUIManager.js b/Libraries/ReactNative/PaperUIManager.js
index 146af3d2028..3e7e8dec4da 100644
--- a/Libraries/ReactNative/PaperUIManager.js
+++ b/Libraries/ReactNative/PaperUIManager.js
@@ -40,7 +40,7 @@ const UIManagerJS = {
   getConstants(): Object {
     return getConstants();
   },
-  getViewManagerConfig: function(viewManagerName: string): any {
+  getViewManagerConfig: function (viewManagerName: string): any {
     if (
       viewManagerConfigs[viewManagerName] === undefined &&
       NativeUIManager.getConstantsForViewManager
@@ -97,7 +97,7 @@ function lazifyViewManagerConfig(viewName) {
         const viewManager = NativeModules[viewConfig.Manager];
         const constants = {};
         viewManager &&
-          Object.keys(viewManager).forEach(key => {
+          Object.keys(viewManager).forEach((key) => {
             const value = viewManager[key];
             if (typeof value !== 'function') {
               constants[key] = value;
@@ -112,7 +112,7 @@ function lazifyViewManagerConfig(viewName) {
         const commands = {};
         let index = 0;
         viewManager &&
-          Object.keys(viewManager).forEach(key => {
+          Object.keys(viewManager).forEach((key) => {
             const value = viewManager[key];
             if (typeof value === 'function') {
               commands[key] = index++;
@@ -130,11 +130,11 @@ function lazifyViewManagerConfig(viewName) {
  * namespace instead of UIManager, unlike Android.
  */
 if (Platform.OS === 'ios') {
-  Object.keys(getConstants()).forEach(viewName => {
+  Object.keys(getConstants()).forEach((viewName) => {
     lazifyViewManagerConfig(viewName);
   });
 } else if (getConstants().ViewManagerNames) {
-  NativeUIManager.getConstants().ViewManagerNames.forEach(viewManagerName => {
+  NativeUIManager.getConstants().ViewManagerNames.forEach((viewManagerName) => {
     defineLazyObjectProperty(NativeUIManager, viewManagerName, {
       get: () => NativeUIManager.getConstantsForViewManager(viewManagerName),
     });
@@ -142,7 +142,7 @@ if (Platform.OS === 'ios') {
 }
 
 if (!global.nativeCallSyncHook) {
-  Object.keys(getConstants()).forEach(viewManagerName => {
+  Object.keys(getConstants()).forEach((viewManagerName) => {
     if (!UIManagerProperties.includes(viewManagerName)) {
       if (!viewManagerConfigs[viewManagerName]) {
         viewManagerConfigs[viewManagerName] = getConstants()[viewManagerName];
diff --git a/Libraries/ReactNative/queryLayoutByID.js b/Libraries/ReactNative/queryLayoutByID.js
index 5d148af957d..bd37623bb1e 100644
--- a/Libraries/ReactNative/queryLayoutByID.js
+++ b/Libraries/ReactNative/queryLayoutByID.js
@@ -43,7 +43,7 @@ type OnErrorCallback = (error: any) => void;
  * @param {function} onError `func(error)`
  * @param {function} onSuccess `func(left, top, width, height, pageX, pageY)`
  */
-const queryLayoutByID = function(
+const queryLayoutByID = function (
   tag: ?number,
   onError: OnErrorCallback,
   onSuccess: OnSuccessCallback,
diff --git a/Libraries/Renderer/shims/ReactNativeViewConfigRegistry.js b/Libraries/Renderer/shims/ReactNativeViewConfigRegistry.js
index 2c09ddf3caa..29ddc460576 100644
--- a/Libraries/Renderer/shims/ReactNativeViewConfigRegistry.js
+++ b/Libraries/Renderer/shims/ReactNativeViewConfigRegistry.js
@@ -82,7 +82,7 @@ function processEventTypes(
  * A callback is provided to load the view config from UIManager.
  * The callback is deferred until the view is actually rendered.
  */
-exports.register = function(name: string, callback: ViewConfigGetter): string {
+exports.register = function (name: string, callback: ViewConfigGetter): string {
   invariant(
     !viewConfigCallbacks.has(name),
     'Tried to register two views with the same name %s',
@@ -103,7 +103,7 @@ exports.register = function(name: string, callback: ViewConfigGetter): string {
  * If this is the first time the view has been used,
  * This configuration will be lazy-loaded from UIManager.
  */
-exports.get = function(name: string): ReactNativeBaseComponentViewConfig<> {
+exports.get = function (name: string): ReactNativeBaseComponentViewConfig<> {
   let viewConfig;
   if (!viewConfigs.has(name)) {
     const callback = viewConfigCallbacks.get(name);
diff --git a/Libraries/Renderer/shims/createReactNativeComponentClass.js b/Libraries/Renderer/shims/createReactNativeComponentClass.js
index 86a758d918b..900bc7c4b71 100644
--- a/Libraries/Renderer/shims/createReactNativeComponentClass.js
+++ b/Libraries/Renderer/shims/createReactNativeComponentClass.js
@@ -24,7 +24,7 @@ const {register} = ReactNativeViewConfigRegistry;
  * @param {string} config iOS View configuration.
  * @private
  */
-const createReactNativeComponentClass = function(
+const createReactNativeComponentClass = function (
   name: string,
   callback: ViewConfigGetter,
 ): string {
diff --git a/Libraries/Settings/Settings.ios.js b/Libraries/Settings/Settings.ios.js
index cba39734037..812619776cc 100644
--- a/Libraries/Settings/Settings.ios.js
+++ b/Libraries/Settings/Settings.ios.js
@@ -57,13 +57,13 @@ const Settings = {
   },
 
   _sendObservations(body: Object) {
-    Object.keys(body).forEach(key => {
+    Object.keys(body).forEach((key) => {
       const newValue = body[key];
       const didChange = this._settings[key] !== newValue;
       this._settings[key] = newValue;
 
       if (didChange) {
-        subscriptions.forEach(sub => {
+        subscriptions.forEach((sub) => {
           if (sub.keys.indexOf(key) !== -1 && sub.callback) {
             sub.callback();
           }
diff --git a/Libraries/Share/Share.js b/Libraries/Share/Share.js
index aed341e56d0..2537b8ab687 100644
--- a/Libraries/Share/Share.js
+++ b/Libraries/Share/Share.js
@@ -128,7 +128,7 @@ class Share {
             tintColor: typeof tintColor === 'number' ? tintColor : undefined,
             excludedActivityTypes: options.excludedActivityTypes,
           },
-          error => reject(error),
+          (error) => reject(error),
           (success, activityType) => {
             if (success) {
               resolve({
diff --git a/Libraries/Storage/AsyncStorage.js b/Libraries/Storage/AsyncStorage.js
index 67f365a0e03..792dfe5f371 100644
--- a/Libraries/Storage/AsyncStorage.js
+++ b/Libraries/Storage/AsyncStorage.js
@@ -35,13 +35,13 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#getitem
    */
-  getItem: function(
+  getItem: function (
     key: string,
     callback?: ?(error: ?Error, result: ?string) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.multiGet([key], function(errors, result) {
+      RCTAsyncStorage.multiGet([key], function (errors, result) {
         // Unpack result to get value from [[key,value]]
         const value = result && result[0] && result[0][1] ? result[0][1] : null;
         const errs = convertErrors(errors);
@@ -60,14 +60,14 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#setitem
    */
-  setItem: function(
+  setItem: function (
     key: string,
     value: string,
     callback?: ?(error: ?Error) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.multiSet([[key, value]], function(errors) {
+      RCTAsyncStorage.multiSet([[key, value]], function (errors) {
         const errs = convertErrors(errors);
         callback && callback(errs && errs[0]);
         if (errs) {
@@ -84,13 +84,13 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#removeitem
    */
-  removeItem: function(
+  removeItem: function (
     key: string,
     callback?: ?(error: ?Error) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.multiRemove([key], function(errors) {
+      RCTAsyncStorage.multiRemove([key], function (errors) {
         const errs = convertErrors(errors);
         callback && callback(errs && errs[0]);
         if (errs) {
@@ -110,14 +110,14 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#mergeitem
    */
-  mergeItem: function(
+  mergeItem: function (
     key: string,
     value: string,
     callback?: ?(error: ?Error) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.multiMerge([[key, value]], function(errors) {
+      RCTAsyncStorage.multiMerge([[key, value]], function (errors) {
         const errs = convertErrors(errors);
         callback && callback(errs && errs[0]);
         if (errs) {
@@ -136,10 +136,10 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#clear
    */
-  clear: function(callback?: ?(error: ?Error) => void): Promise {
+  clear: function (callback?: ?(error: ?Error) => void): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.clear(function(error) {
+      RCTAsyncStorage.clear(function (error) {
         callback && callback(convertError(error));
         if (error && convertError(error)) {
           reject(convertError(error));
@@ -155,12 +155,12 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#getallkeys
    */
-  getAllKeys: function(
+  getAllKeys: function (
     callback?: ?(error: ?Error, keys: ?Array<string>) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.getAllKeys(function(error, keys) {
+      RCTAsyncStorage.getAllKeys(function (error, keys) {
         callback && callback(convertError(error), keys);
         if (error) {
           reject(convertError(error));
@@ -186,7 +186,7 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#flushgetrequests
    * */
-  flushGetRequests: function(): void {
+  flushGetRequests: function (): void {
     const getRequests = this._getRequests;
     const getKeys = this._getKeys;
 
@@ -194,7 +194,7 @@ const AsyncStorage = {
     this._getKeys = [];
 
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
-    RCTAsyncStorage.multiGet(getKeys, function(errors, result) {
+    RCTAsyncStorage.multiGet(getKeys, function (errors, result) {
       // Even though the runtime complexity of this is theoretically worse vs if we used a map,
       // it's much, much faster in practice for the data sets we deal with (we avoid
       // allocating result pair arrays). This was heavily benchmarked.
@@ -211,7 +211,7 @@ const AsyncStorage = {
       for (let i = 0; i < reqLength; i++) {
         const request = getRequests[i];
         const requestKeys = request.keys;
-        const requestResult = requestKeys.map(key => [key, map[key]]);
+        const requestResult = requestKeys.map((key) => [key, map[key]]);
         request.callback && request.callback(null, requestResult);
         request.resolve && request.resolve(requestResult);
       }
@@ -225,7 +225,7 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#multiget
    */
-  multiGet: function(
+  multiGet: function (
     keys: Array<string>,
     callback?: ?(errors: ?Array<Error>, result: ?Array<Array<string>>) => void,
   ): Promise {
@@ -252,7 +252,7 @@ const AsyncStorage = {
 
     this._getRequests.push(getRequest);
     // avoid fetching duplicates
-    keys.forEach(key => {
+    keys.forEach((key) => {
       if (this._getKeys.indexOf(key) === -1) {
         this._getKeys.push(key);
       }
@@ -267,13 +267,13 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#multiset
    */
-  multiSet: function(
+  multiSet: function (
     keyValuePairs: Array<Array<string>>,
     callback?: ?(errors: ?Array<Error>) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.multiSet(keyValuePairs, function(errors) {
+      RCTAsyncStorage.multiSet(keyValuePairs, function (errors) {
         const error = convertErrors(errors);
         callback && callback(error);
         if (error) {
@@ -290,13 +290,13 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#multiremove
    */
-  multiRemove: function(
+  multiRemove: function (
     keys: Array<string>,
     callback?: ?(errors: ?Array<Error>) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.multiRemove(keys, function(errors) {
+      RCTAsyncStorage.multiRemove(keys, function (errors) {
         const error = convertErrors(errors);
         callback && callback(error);
         if (error) {
@@ -316,13 +316,13 @@ const AsyncStorage = {
    *
    * See https://reactnative.dev/docs/asyncstorage.html#multimerge
    */
-  multiMerge: function(
+  multiMerge: function (
     keyValuePairs: Array<Array<string>>,
     callback?: ?(errors: ?Array<Error>) => void,
   ): Promise {
     invariant(RCTAsyncStorage, 'RCTAsyncStorage not available');
     return new Promise((resolve, reject) => {
-      RCTAsyncStorage.multiMerge(keyValuePairs, function(errors) {
+      RCTAsyncStorage.multiMerge(keyValuePairs, function (errors) {
         const error = convertErrors(errors);
         callback && callback(error);
         if (error) {
@@ -345,7 +345,7 @@ function convertErrors(errs) {
   if (!errs) {
     return null;
   }
-  return (Array.isArray(errs) ? errs : [errs]).map(e => convertError(e));
+  return (Array.isArray(errs) ? errs : [errs]).map((e) => convertError(e));
 }
 
 function convertError(error) {
diff --git a/Libraries/StyleSheet/StyleSheetValidation.js b/Libraries/StyleSheet/StyleSheetValidation.js
index bfa09f702e6..f7691711bb1 100644
--- a/Libraries/StyleSheet/StyleSheetValidation.js
+++ b/Libraries/StyleSheet/StyleSheetValidation.js
@@ -74,7 +74,7 @@ class StyleSheetValidation {
   }
 }
 
-const styleError = function(message1, style, caller?, message2?) {
+const styleError = function (message1, style, caller?, message2?) {
   invariant(
     false,
     message1 +
diff --git a/Libraries/StyleSheet/__flowtests__/StyleSheet-flowtest.js b/Libraries/StyleSheet/__flowtests__/StyleSheet-flowtest.js
index c93c8de63cd..fddb4158f69 100644
--- a/Libraries/StyleSheet/__flowtests__/StyleSheet-flowtest.js
+++ b/Libraries/StyleSheet/__flowtests__/StyleSheet-flowtest.js
@@ -18,53 +18,29 @@ const textStyle = {color: 'rgb(0, 0, 0)'};
 
 module.exports = {
   testGoodCompose() {
-    (StyleSheet.compose(
-      imageStyle,
-      imageStyle,
-    ): ImageStyleProp);
+    (StyleSheet.compose(imageStyle, imageStyle): ImageStyleProp);
 
-    (StyleSheet.compose(
-      textStyle,
-      textStyle,
-    ): TextStyleProp);
+    (StyleSheet.compose(textStyle, textStyle): TextStyleProp);
 
-    (StyleSheet.compose(
-      null,
-      null,
-    ): TextStyleProp);
+    (StyleSheet.compose(null, null): TextStyleProp);
 
-    (StyleSheet.compose(
-      textStyle,
-      null,
-    ): TextStyleProp);
+    (StyleSheet.compose(textStyle, null): TextStyleProp);
 
     (StyleSheet.compose(
       textStyle,
       Math.random() < 0.5 ? textStyle : null,
     ): TextStyleProp);
 
-    (StyleSheet.compose(
-      [textStyle],
-      null,
-    ): TextStyleProp);
+    (StyleSheet.compose([textStyle], null): TextStyleProp);
 
-    (StyleSheet.compose(
-      [textStyle],
-      null,
-    ): TextStyleProp);
+    (StyleSheet.compose([textStyle], null): TextStyleProp);
 
-    (StyleSheet.compose(
-      [textStyle],
-      [textStyle],
-    ): TextStyleProp);
+    (StyleSheet.compose([textStyle], [textStyle]): TextStyleProp);
   },
 
   testBadCompose() {
     // $FlowExpectedError - Incompatible type.
-    (StyleSheet.compose(
-      textStyle,
-      textStyle,
-    ): ImageStyleProp);
+    (StyleSheet.compose(textStyle, textStyle): ImageStyleProp);
 
     // $FlowExpectedError - Incompatible type.
     (StyleSheet.compose(
diff --git a/Libraries/StyleSheet/__tests__/normalizeColor-test.js b/Libraries/StyleSheet/__tests__/normalizeColor-test.js
index 2a127626b69..041c9cdb027 100644
--- a/Libraries/StyleSheet/__tests__/normalizeColor-test.js
+++ b/Libraries/StyleSheet/__tests__/normalizeColor-test.js
@@ -20,8 +20,8 @@ const DynamicColorIOS = require('../PlatformColorValueTypesIOS.ios')
 const PlatformColorAndroid = require('../PlatformColorValueTypes.android')
   .PlatformColor;
 
-describe('normalizeColor', function() {
-  it('should accept only spec compliant colors', function() {
+describe('normalizeColor', function () {
+  it('should accept only spec compliant colors', function () {
     expect(normalizeColor('#abc')).not.toBe(null);
     expect(normalizeColor('#abcd')).not.toBe(null);
     expect(normalizeColor('#abcdef')).not.toBe(null);
@@ -36,12 +36,12 @@ describe('normalizeColor', function() {
     expect(normalizeColor(0xffffffff + 1)).toBe(null);
   });
 
-  it('should temporarily accept floating point values for rgb', function() {
+  it('should temporarily accept floating point values for rgb', function () {
     expect(normalizeColor('rgb(1.1, 2.1, 3.1)')).toBe(0x010203ff);
     expect(normalizeColor('rgba(1.1, 2.1, 3.1, 1.0)')).toBe(0x010203ff);
   });
 
-  it('should refuse non spec compliant colors', function() {
+  it('should refuse non spec compliant colors', function () {
     expect(normalizeColor('#00gg00')).toBe(null);
     expect(normalizeColor('rgb(1, 2, 3,)')).toBe(null);
     expect(normalizeColor('rgb(1, 2, 3')).toBe(null);
@@ -59,7 +59,7 @@ describe('normalizeColor', function() {
     expect(normalizeColor('rgb(1%, 2%, 3%)')).toBe(null);
   });
 
-  it('should handle hex6 properly', function() {
+  it('should handle hex6 properly', function () {
     expect(normalizeColor('#000000')).toBe(0x000000ff);
     expect(normalizeColor('#ffffff')).toBe(0xffffffff);
     expect(normalizeColor('#ff00ff')).toBe(0xff00ffff);
@@ -67,13 +67,13 @@ describe('normalizeColor', function() {
     expect(normalizeColor('#012345')).toBe(0x012345ff);
   });
 
-  it('should handle hex3 properly', function() {
+  it('should handle hex3 properly', function () {
     expect(normalizeColor('#000')).toBe(0x000000ff);
     expect(normalizeColor('#fff')).toBe(0xffffffff);
     expect(normalizeColor('#f0f')).toBe(0xff00ffff);
   });
 
-  it('should handle hex8 properly', function() {
+  it('should handle hex8 properly', function () {
     expect(normalizeColor('#00000000')).toBe(0x00000000);
     expect(normalizeColor('#ffffffff')).toBe(0xffffffff);
     expect(normalizeColor('#ffff00ff')).toBe(0xffff00ff);
@@ -81,7 +81,7 @@ describe('normalizeColor', function() {
     expect(normalizeColor('#01234567')).toBe(0x01234567);
   });
 
-  it('should handle rgb properly', function() {
+  it('should handle rgb properly', function () {
     expect(normalizeColor('rgb(0, 0, 0)')).toBe(0x000000ff);
     expect(normalizeColor('rgb(-1, -2, -3)')).toBe(0x000000ff);
     expect(normalizeColor('rgb(0, 0, 255)')).toBe(0x0000ffff);
@@ -90,7 +90,7 @@ describe('normalizeColor', function() {
     expect(normalizeColor('rgb(256, 256, 256)')).toBe(0xffffffff);
   });
 
-  it('should handle rgba properly', function() {
+  it('should handle rgba properly', function () {
     expect(normalizeColor('rgba(0, 0, 0, 0.0)')).toBe(0x00000000);
     expect(normalizeColor('rgba(0, 0, 0, 0)')).toBe(0x00000000);
     expect(normalizeColor('rgba(0, 0, 0, -0.5)')).toBe(0x00000000);
@@ -100,7 +100,7 @@ describe('normalizeColor', function() {
     expect(normalizeColor('rgba(100, 15, 69, 0.5)')).toBe(0x640f4580);
   });
 
-  it('should handle hsl properly', function() {
+  it('should handle hsl properly', function () {
     expect(normalizeColor('hsl(0, 0%, 0%)')).toBe(0x000000ff);
     expect(normalizeColor('hsl(360, 100%, 100%)')).toBe(0xffffffff);
     expect(normalizeColor('hsl(180, 50%, 50%)')).toBe(0x40bfbfff);
@@ -112,27 +112,27 @@ describe('normalizeColor', function() {
     expect(normalizeColor('hsl(70, -10%, 75%)')).toBe(0xbfbfbfff);
   });
 
-  it('should handle hsla properly', function() {
+  it('should handle hsla properly', function () {
     expect(normalizeColor('hsla(0, 0%, 0%, 0)')).toBe(0x00000000);
     expect(normalizeColor('hsla(360, 100%, 100%, 1)')).toBe(0xffffffff);
     expect(normalizeColor('hsla(360, 100%, 100%, 0)')).toBe(0xffffff00);
     expect(normalizeColor('hsla(180, 50%, 50%, 0.2)')).toBe(0x40bfbf33);
   });
 
-  it('should handle named colors properly', function() {
+  it('should handle named colors properly', function () {
     expect(normalizeColor('red')).toBe(0xff0000ff);
     expect(normalizeColor('transparent')).toBe(0x00000000);
     expect(normalizeColor('peachpuff')).toBe(0xffdab9ff);
   });
 
-  it('should handle number colors properly', function() {
+  it('should handle number colors properly', function () {
     expect(normalizeColor(0x00000000)).toBe(0x00000000);
     expect(normalizeColor(0xff0000ff)).toBe(0xff0000ff);
     expect(normalizeColor(0xffffffff)).toBe(0xffffffff);
     expect(normalizeColor(0x01234567)).toBe(0x01234567);
   });
 
-  it("should return the same color when it's already normalized", function() {
+  it("should return the same color when it's already normalized", function () {
     const normalizedColor = normalizeColor('red') || 0;
     expect(normalizeColor(normalizedColor)).toBe(normalizedColor);
   });
diff --git a/Libraries/StyleSheet/__tests__/processColor-test.js b/Libraries/StyleSheet/__tests__/processColor-test.js
index d428b854e8f..70b723a3f79 100644
--- a/Libraries/StyleSheet/__tests__/processColor-test.js
+++ b/Libraries/StyleSheet/__tests__/processColor-test.js
@@ -22,8 +22,8 @@ const PlatformColorAndroid = require('../PlatformColorValueTypes.android')
 
 const platformSpecific =
   OS === 'android'
-    ? unsigned => unsigned | 0 //eslint-disable-line no-bitwise
-    : x => x;
+    ? (unsigned) => unsigned | 0 //eslint-disable-line no-bitwise
+    : (x) => x;
 
 describe('processColor', () => {
   describe('predefined color names', () => {
diff --git a/Libraries/StyleSheet/__tests__/processColorArray-test.js b/Libraries/StyleSheet/__tests__/processColorArray-test.js
index 1be389cdb92..73bbd95991c 100644
--- a/Libraries/StyleSheet/__tests__/processColorArray-test.js
+++ b/Libraries/StyleSheet/__tests__/processColorArray-test.js
@@ -22,8 +22,8 @@ const PlatformColorAndroid = require('../PlatformColorValueTypes.android')
 
 const platformSpecific =
   OS === 'android'
-    ? unsigned => unsigned | 0 //eslint-disable-line no-bitwise
-    : x => x;
+    ? (unsigned) => unsigned | 0 //eslint-disable-line no-bitwise
+    : (x) => x;
 
 describe('processColorArray', () => {
   describe('predefined color name array', () => {
diff --git a/Libraries/StyleSheet/__tests__/setNormalizedColorAlpha-test.js b/Libraries/StyleSheet/__tests__/setNormalizedColorAlpha-test.js
index bc400b56c94..15b40d95e03 100644
--- a/Libraries/StyleSheet/__tests__/setNormalizedColorAlpha-test.js
+++ b/Libraries/StyleSheet/__tests__/setNormalizedColorAlpha-test.js
@@ -13,22 +13,22 @@
 const setNormalizedColorAlpha = require('../setNormalizedColorAlpha');
 const normalizeColor = require('../normalizeColor');
 
-describe('setNormalizedColorAlpha', function() {
-  it('should adjust the alpha of the color passed in', function() {
+describe('setNormalizedColorAlpha', function () {
+  it('should adjust the alpha of the color passed in', function () {
     expect(setNormalizedColorAlpha(0xffffffff, 0.4)).toBe(0xffffff66);
     expect(setNormalizedColorAlpha(0x204080ff, 0.6)).toBe(0x20408099);
   });
 
-  it('should clamp invalid input', function() {
+  it('should clamp invalid input', function () {
     expect(setNormalizedColorAlpha(0xffffffff, 1.5)).toBe(0xffffffff);
     expect(setNormalizedColorAlpha(0xffffffff, -1)).toBe(0xffffff00);
   });
 
-  it("should ignore the color's original alpha", function() {
+  it("should ignore the color's original alpha", function () {
     expect(setNormalizedColorAlpha(0x204080aa, 0.8)).toBe(0x204080cc);
   });
 
-  it('should return the original color when alpha is unchanged', function() {
+  it('should return the original color when alpha is unchanged', function () {
     const originalColor = normalizeColor('blue');
     expect(setNormalizedColorAlpha(originalColor, 1)).toBe(originalColor);
   });
diff --git a/Libraries/StyleSheet/processTransform.js b/Libraries/StyleSheet/processTransform.js
index 79ed51d9f89..3a61bf53359 100644
--- a/Libraries/StyleSheet/processTransform.js
+++ b/Libraries/StyleSheet/processTransform.js
@@ -40,7 +40,7 @@ function processTransform(
 
   const result = MatrixMath.createIdentityMatrix();
 
-  transform.forEach(transformation => {
+  transform.forEach((transformation) => {
     const key = Object.keys(transformation)[0];
     const value = transformation[key];
 
@@ -137,7 +137,7 @@ function _convertToRadians(value: string): number {
 }
 
 function _validateTransforms(transform: Array<Object>): void {
-  transform.forEach(transformation => {
+  transform.forEach((transformation) => {
     const keys = Object.keys(transformation);
     invariant(
       keys.length === 1,
diff --git a/Libraries/StyleSheet/splitLayoutProps.js b/Libraries/StyleSheet/splitLayoutProps.js
index 953b3e55f46..43166d1422e 100644
--- a/Libraries/StyleSheet/splitLayoutProps.js
+++ b/Libraries/StyleSheet/splitLayoutProps.js
@@ -49,7 +49,7 @@ function splitLayoutProps(
   const inner = {};
   const outer = {};
   if (props) {
-    Object.keys(props).forEach(k => {
+    Object.keys(props).forEach((k) => {
       const value: $ElementType<DangerouslyImpreciseStyle, typeof k> = props[k];
       if (OUTER_PROPS[k]) {
         outer[k] = value;
diff --git a/Libraries/Text/Text.js b/Libraries/Text/Text.js
index 660dd879761..f08e51ab2d8 100644
--- a/Libraries/Text/Text.js
+++ b/Libraries/Text/Text.js
@@ -151,7 +151,7 @@ class TouchableText extends React.Component<Props, State> {
     }
     return (
       <TextAncestor.Consumer>
-        {hasTextAncestor =>
+        {(hasTextAncestor) =>
           hasTextAncestor ? (
             <RCTVirtualText {...props} ref={props.forwardedRef} />
           ) : (
diff --git a/Libraries/Utilities/BackHandler.android.js b/Libraries/Utilities/BackHandler.android.js
index e6e3d035295..ab7e8ba4ecd 100644
--- a/Libraries/Utilities/BackHandler.android.js
+++ b/Libraries/Utilities/BackHandler.android.js
@@ -19,7 +19,7 @@ type BackPressEventName = 'backPress' | 'hardwareBackPress';
 
 const _backPressSubscriptions = [];
 
-RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function() {
+RCTDeviceEventEmitter.addListener(DEVICE_BACK_EVENT, function () {
   for (let i = _backPressSubscriptions.length - 1; i >= 0; i--) {
     if (_backPressSubscriptions[i]()) {
       return;
@@ -71,7 +71,7 @@ type TBackHandler = {|
   ) => void,
 |};
 const BackHandler: TBackHandler = {
-  exitApp: function(): void {
+  exitApp: function (): void {
     if (!NativeDeviceEventManager) {
       return;
     }
@@ -85,7 +85,7 @@ const BackHandler: TBackHandler = {
    * - `hardwareBackPress`: Fires when the Android hardware back button is pressed or when the
    * tvOS menu button is pressed.
    */
-  addEventListener: function(
+  addEventListener: function (
     eventName: BackPressEventName,
     handler: Function,
   ): {remove: () => void, ...} {
@@ -100,7 +100,7 @@ const BackHandler: TBackHandler = {
   /**
    * Removes the event handler.
    */
-  removeEventListener: function(
+  removeEventListener: function (
     eventName: BackPressEventName,
     handler: Function,
   ): void {
diff --git a/Libraries/Utilities/BackHandler.ios.js b/Libraries/Utilities/BackHandler.ios.js
index ff2f1c862e5..743d55e530f 100644
--- a/Libraries/Utilities/BackHandler.ios.js
+++ b/Libraries/Utilities/BackHandler.ios.js
@@ -68,7 +68,7 @@ if (Platform.isTV) {
   const _tvEventHandler = new TVEventHandler();
   const _backPressSubscriptions = new Set();
 
-  _tvEventHandler.enable(this, function(cmp, evt) {
+  _tvEventHandler.enable(this, function (cmp, evt) {
     if (evt && evt.eventType === 'menu') {
       let invokeDefault = true;
       const subscriptions = Array.from(
@@ -91,7 +91,7 @@ if (Platform.isTV) {
   BackHandler = {
     exitApp: emptyFunction,
 
-    addEventListener: function(
+    addEventListener: function (
       eventName: BackPressEventName,
       handler: Function,
     ): {remove: () => void, ...} {
@@ -101,7 +101,7 @@ if (Platform.isTV) {
       };
     },
 
-    removeEventListener: function(
+    removeEventListener: function (
       eventName: BackPressEventName,
       handler: Function,
     ): void {
diff --git a/Libraries/Utilities/DevSettings.js b/Libraries/Utilities/DevSettings.js
index 42ffec85148..f817dfe7807 100644
--- a/Libraries/Utilities/DevSettings.js
+++ b/Libraries/Utilities/DevSettings.js
@@ -32,7 +32,7 @@ class DevSettings extends NativeEventEmitter {
     }
 
     this._menuItems.set(title, handler);
-    this.addListener('didPressMenuItem', event => {
+    this.addListener('didPressMenuItem', (event) => {
       if (event.title === title) {
         handler();
       }
diff --git a/Libraries/Utilities/HMRClient.js b/Libraries/Utilities/HMRClient.js
index 48fd40fdab9..86daa91a915 100644
--- a/Libraries/Utilities/HMRClient.js
+++ b/Libraries/Utilities/HMRClient.js
@@ -119,7 +119,7 @@ const HMRClient: HMRClientNativeInterface = {
         JSON.stringify({
           type: 'log',
           level,
-          data: data.map(item =>
+          data: data.map((item) =>
             typeof item === 'string'
               ? item
               : prettyFormat(item, {
@@ -163,7 +163,7 @@ const HMRClient: HMRClientNativeInterface = {
       `ws://${wsHost}/hot?bundleEntry=${bundleEntry}&platform=${platform}`,
     );
 
-    client.on('connection-error', e => {
+    client.on('connection-error', (e) => {
       let error = `Cannot connect to the Metro server.
 
 Try the following to fix the issue:
@@ -208,7 +208,7 @@ Error: ${e.message}`;
       LoadingView.hide();
     });
 
-    client.on('error', data => {
+    client.on('error', (data) => {
       LoadingView.hide();
 
       if (data.type === 'GraphNotFoundError') {
@@ -229,7 +229,7 @@ Error: ${e.message}`;
       }
     });
 
-    client.on('close', data => {
+    client.on('close', (data) => {
       LoadingView.hide();
       setHMRUnavailableReason('Disconnected from the Metro server.');
     });
diff --git a/Libraries/Utilities/JSDevSupportModule.js b/Libraries/Utilities/JSDevSupportModule.js
index 9e6d60dce01..2d84703a404 100644
--- a/Libraries/Utilities/JSDevSupportModule.js
+++ b/Libraries/Utilities/JSDevSupportModule.js
@@ -14,7 +14,7 @@ import NativeJSDevSupport from './NativeJSDevSupport';
 const ReactNative = require('../Renderer/shims/ReactNative');
 
 const JSDevSupportModule = {
-  getJSHierarchy: function(tag: number) {
+  getJSHierarchy: function (tag: number) {
     if (NativeJSDevSupport) {
       const constants = NativeJSDevSupport.getConstants();
       try {
diff --git a/Libraries/Utilities/MatrixMath.js b/Libraries/Utilities/MatrixMath.js
index 2a943a8961a..40cbfe68bce 100755
--- a/Libraries/Utilities/MatrixMath.js
+++ b/Libraries/Utilities/MatrixMath.js
@@ -17,11 +17,11 @@ const invariant = require('invariant');
  * matrices, which are reusable.
  */
 const MatrixMath = {
-  createIdentityMatrix: function() {
+  createIdentityMatrix: function () {
     return [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
   },
 
-  createCopy: function(m) {
+  createCopy: function (m) {
     return [
       m[0],
       m[1],
@@ -42,7 +42,7 @@ const MatrixMath = {
     ];
   },
 
-  createOrthographic: function(left, right, bottom, top, near, far) {
+  createOrthographic: function (left, right, bottom, top, near, far) {
     const a = 2 / (right - left);
     const b = 2 / (top - bottom);
     const c = -2 / (far - near);
@@ -54,7 +54,7 @@ const MatrixMath = {
     return [a, 0, 0, 0, 0, b, 0, 0, 0, 0, c, 0, tx, ty, tz, 1];
   },
 
-  createFrustum: function(left, right, bottom, top, near, far) {
+  createFrustum: function (left, right, bottom, top, near, far) {
     const r_width = 1 / (right - left);
     const r_height = 1 / (top - bottom);
     const r_depth = 1 / (near - far);
@@ -73,7 +73,7 @@ const MatrixMath = {
    *
    * @param fovInRadians - field of view in randians
    */
-  createPerspective: function(fovInRadians, aspect, near, far) {
+  createPerspective: function (fovInRadians, aspect, near, far) {
     const h = 1 / Math.tan(fovInRadians / 2);
     const r_depth = 1 / (near - far);
     const C = (far + near) * r_depth;
@@ -81,41 +81,41 @@ const MatrixMath = {
     return [h / aspect, 0, 0, 0, 0, h, 0, 0, 0, 0, C, -1, 0, 0, D, 0];
   },
 
-  createTranslate2d: function(x, y) {
+  createTranslate2d: function (x, y) {
     const mat = MatrixMath.createIdentityMatrix();
     MatrixMath.reuseTranslate2dCommand(mat, x, y);
     return mat;
   },
 
-  reuseTranslate2dCommand: function(matrixCommand, x, y) {
+  reuseTranslate2dCommand: function (matrixCommand, x, y) {
     matrixCommand[12] = x;
     matrixCommand[13] = y;
   },
 
-  reuseTranslate3dCommand: function(matrixCommand, x, y, z) {
+  reuseTranslate3dCommand: function (matrixCommand, x, y, z) {
     matrixCommand[12] = x;
     matrixCommand[13] = y;
     matrixCommand[14] = z;
   },
 
-  createScale: function(factor) {
+  createScale: function (factor) {
     const mat = MatrixMath.createIdentityMatrix();
     MatrixMath.reuseScaleCommand(mat, factor);
     return mat;
   },
 
-  reuseScaleCommand: function(matrixCommand, factor) {
+  reuseScaleCommand: function (matrixCommand, factor) {
     matrixCommand[0] = factor;
     matrixCommand[5] = factor;
   },
 
-  reuseScale3dCommand: function(matrixCommand, x, y, z) {
+  reuseScale3dCommand: function (matrixCommand, x, y, z) {
     matrixCommand[0] = x;
     matrixCommand[5] = y;
     matrixCommand[10] = z;
   },
 
-  reusePerspectiveCommand: function(matrixCommand, p) {
+  reusePerspectiveCommand: function (matrixCommand, p) {
     matrixCommand[11] = -1 / p;
   },
 
@@ -131,14 +131,14 @@ const MatrixMath = {
     matrixCommand[10] = factor;
   },
 
-  reuseRotateXCommand: function(matrixCommand, radians) {
+  reuseRotateXCommand: function (matrixCommand, radians) {
     matrixCommand[5] = Math.cos(radians);
     matrixCommand[6] = Math.sin(radians);
     matrixCommand[9] = -Math.sin(radians);
     matrixCommand[10] = Math.cos(radians);
   },
 
-  reuseRotateYCommand: function(matrixCommand, amount) {
+  reuseRotateYCommand: function (matrixCommand, amount) {
     matrixCommand[0] = Math.cos(amount);
     matrixCommand[2] = -Math.sin(amount);
     matrixCommand[8] = Math.sin(amount);
@@ -146,28 +146,28 @@ const MatrixMath = {
   },
 
   // http://www.w3.org/TR/css3-transforms/#recomposing-to-a-2d-matrix
-  reuseRotateZCommand: function(matrixCommand, radians) {
+  reuseRotateZCommand: function (matrixCommand, radians) {
     matrixCommand[0] = Math.cos(radians);
     matrixCommand[1] = Math.sin(radians);
     matrixCommand[4] = -Math.sin(radians);
     matrixCommand[5] = Math.cos(radians);
   },
 
-  createRotateZ: function(radians) {
+  createRotateZ: function (radians) {
     const mat = MatrixMath.createIdentityMatrix();
     MatrixMath.reuseRotateZCommand(mat, radians);
     return mat;
   },
 
-  reuseSkewXCommand: function(matrixCommand, radians) {
+  reuseSkewXCommand: function (matrixCommand, radians) {
     matrixCommand[4] = Math.tan(radians);
   },
 
-  reuseSkewYCommand: function(matrixCommand, radians) {
+  reuseSkewYCommand: function (matrixCommand, radians) {
     matrixCommand[1] = Math.tan(radians);
   },
 
-  multiplyInto: function(out, a, b) {
+  multiplyInto: function (out, a, b) {
     const a00 = a[0],
       a01 = a[1],
       a02 = a[2],
diff --git a/Libraries/Utilities/ReactNativeTestTools.js b/Libraries/Utilities/ReactNativeTestTools.js
index 8ea11c8579b..0ca83f11752 100644
--- a/Libraries/Utilities/ReactNativeTestTools.js
+++ b/Libraries/Utilities/ReactNativeTestTools.js
@@ -41,7 +41,7 @@ const {
 
 function byClickable(): Predicate {
   return withMessage(
-    node =>
+    (node) =>
       // note: <Text /> lazy-mounts press handlers after the first press,
       //       so this is a workaround for targeting text nodes.
       (node.type === Text &&
@@ -68,7 +68,7 @@ function byClickable(): Predicate {
 
 function byTestID(testID: string): Predicate {
   return withMessage(
-    node => node.props && node.props.testID === testID,
+    (node) => node.props && node.props.testID === testID,
     `testID prop equals ${testID}`,
   );
 }
@@ -78,7 +78,7 @@ function byTextMatching(regex: RegExp): Predicate {
     /* $FlowFixMe(>=0.120.0) This comment suppresses an error found when Flow
      * v0.120 was deployed. To see the error, delete this comment and run Flow.
      */
-    node => node.props && regex.exec(node.props.children),
+    (node) => node.props && regex.exec(node.props.children),
     `text content matches ${regex.toString()}`,
   );
 }
@@ -170,7 +170,7 @@ function maximumDepthOfJSON(node: ?ReactTestRendererJSON): number {
     return 1;
   } else {
     let maxDepth = 0;
-    node.children.forEach(child => {
+    node.children.forEach((child) => {
       maxDepth = Math.max(maximumDepthOfJSON(child) + 1, maxDepth);
     });
     return maxDepth;
@@ -183,7 +183,7 @@ function renderAndEnforceStrictMode(element: React.Node): any {
 }
 
 function renderWithStrictMode(element: React.Node): ReactTestRendererType {
-  const WorkAroundBugWithStrictModeInTestRenderer = prps => prps.children;
+  const WorkAroundBugWithStrictModeInTestRenderer = (prps) => prps.children;
   const StrictMode = (React: $FlowFixMe).StrictMode;
   return ReactTestRenderer.create(
     <WorkAroundBugWithStrictModeInTestRenderer>
diff --git a/Libraries/Utilities/SceneTracker.js b/Libraries/Utilities/SceneTracker.js
index 23b0c7dcae3..1abcce18bcd 100644
--- a/Libraries/Utilities/SceneTracker.js
+++ b/Libraries/Utilities/SceneTracker.js
@@ -19,7 +19,7 @@ let _activeScene = {name: 'default'};
 const SceneTracker = {
   setActiveScene(scene: Scene) {
     _activeScene = scene;
-    _listeners.forEach(listener => listener(_activeScene));
+    _listeners.forEach((listener) => listener(_activeScene));
   },
 
   getActiveScene(): Scene {
@@ -32,7 +32,7 @@ const SceneTracker = {
     _listeners.push(callback);
     return {
       remove: () => {
-        _listeners = _listeners.filter(listener => callback !== listener);
+        _listeners = _listeners.filter((listener) => callback !== listener);
       },
     };
   },
diff --git a/Libraries/Utilities/__mocks__/BackHandler.js b/Libraries/Utilities/__mocks__/BackHandler.js
index 8422b05057c..255f19678d1 100644
--- a/Libraries/Utilities/__mocks__/BackHandler.js
+++ b/Libraries/Utilities/__mocks__/BackHandler.js
@@ -14,7 +14,7 @@ const _backPressSubscriptions = new Set();
 const BackHandler = {
   exitApp: jest.fn(),
 
-  addEventListener: function(
+  addEventListener: function (
     eventName: BackPressEventName,
     handler: Function,
   ): {remove: () => void} {
@@ -24,14 +24,14 @@ const BackHandler = {
     };
   },
 
-  removeEventListener: function(
+  removeEventListener: function (
     eventName: BackPressEventName,
     handler: Function,
   ): void {
     _backPressSubscriptions.delete(handler);
   },
 
-  mockPressBack: function() {
+  mockPressBack: function () {
     let invokeDefault = true;
     const subscriptions = [..._backPressSubscriptions].reverse();
     for (let i = 0; i < subscriptions.length; ++i) {
diff --git a/Libraries/Utilities/__mocks__/PixelRatio.js b/Libraries/Utilities/__mocks__/PixelRatio.js
index 90c0de2041b..5a5c7142676 100644
--- a/Libraries/Utilities/__mocks__/PixelRatio.js
+++ b/Libraries/Utilities/__mocks__/PixelRatio.js
@@ -12,10 +12,10 @@
 const PixelRatio = {
   get: jest.fn().mockReturnValue(2),
   getFontScale: jest.fn(() => PixelRatio.get()),
-  getPixelSizeForLayoutSize: jest.fn(layoutSize =>
+  getPixelSizeForLayoutSize: jest.fn((layoutSize) =>
     Math.round(layoutSize * PixelRatio.get()),
   ),
-  roundToNearestPixel: jest.fn(layoutSize => {
+  roundToNearestPixel: jest.fn((layoutSize) => {
     const ratio = PixelRatio.get();
     return Math.round(layoutSize * ratio) / ratio;
   }),
diff --git a/Libraries/Utilities/__tests__/MatrixMath-test.js b/Libraries/Utilities/__tests__/MatrixMath-test.js
index f6b62319946..1f349c92770 100644
--- a/Libraries/Utilities/__tests__/MatrixMath-test.js
+++ b/Libraries/Utilities/__tests__/MatrixMath-test.js
@@ -17,7 +17,7 @@ function degreesToRadians(degrees) {
 }
 
 function convertZeroes(degrees) {
-  return degrees.map(value => (value === -0 ? 0 : value));
+  return degrees.map((value) => (value === -0 ? 0 : value));
 }
 
 describe('MatrixMath', () => {
@@ -43,7 +43,7 @@ describe('MatrixMath', () => {
       ]).rotationDegrees,
     ).toEqual([0, 0, 0]);
 
-    [30, 45, 60, 75, 90, 100, 115, 120, 133, 167].forEach(angle => {
+    [30, 45, 60, 75, 90, 100, 115, 120, 133, 167].forEach((angle) => {
       let mat = MatrixMath.createRotateZ(degreesToRadians(angle));
       expect(
         convertZeroes(MatrixMath.decomposeMatrix(mat).rotationDegrees),
@@ -121,7 +121,7 @@ describe('MatrixMath', () => {
 
   it('decomposes a 4x4 matrix to produce accurate Y-axis angles', () => {
     let mat;
-    [30, 45, 60, 75, 90, 100, 110, 120, 133, 167].forEach(angle => {
+    [30, 45, 60, 75, 90, 100, 110, 120, 133, 167].forEach((angle) => {
       mat = MatrixMath.createIdentityMatrix();
       MatrixMath.reuseRotateYCommand(mat, degreesToRadians(angle));
       expect(
@@ -160,7 +160,7 @@ describe('MatrixMath', () => {
 
   it('decomposes a 4x4 matrix to produce accurate X-axis angles', () => {
     let mat;
-    [30, 45, 60, 75, 90, 100, 110, 120, 133, 167].forEach(angle => {
+    [30, 45, 60, 75, 90, 100, 110, 120, 133, 167].forEach((angle) => {
       mat = MatrixMath.createIdentityMatrix();
       MatrixMath.reuseRotateXCommand(mat, degreesToRadians(angle));
       expect(
diff --git a/Libraries/Utilities/__tests__/SceneTracker-test.js b/Libraries/Utilities/__tests__/SceneTracker-test.js
index 909da1685aa..edb6b9125ae 100644
--- a/Libraries/Utilities/__tests__/SceneTracker-test.js
+++ b/Libraries/Utilities/__tests__/SceneTracker-test.js
@@ -12,10 +12,10 @@
 
 const SceneTracker = require('../SceneTracker');
 
-describe('setActiveScene', function() {
-  it('can handle multiple listeners and unsubscribe', function() {
+describe('setActiveScene', function () {
+  it('can handle multiple listeners and unsubscribe', function () {
     const listeners = [jest.fn(), jest.fn(), jest.fn()];
-    const subscriptions = listeners.map(listener =>
+    const subscriptions = listeners.map((listener) =>
       SceneTracker.addActiveSceneChangedListener(listener),
     );
     subscriptions[1].remove();
diff --git a/Libraries/Utilities/__tests__/buildStyleInterpolator-test.js b/Libraries/Utilities/__tests__/buildStyleInterpolator-test.js
index ef5cc10d42d..2c0a597086a 100644
--- a/Libraries/Utilities/__tests__/buildStyleInterpolator-test.js
+++ b/Libraries/Utilities/__tests__/buildStyleInterpolator-test.js
@@ -12,7 +12,7 @@
 
 const buildStyleInterpolator = require('../buildStyleInterpolator');
 
-const validateEmpty = function(interpolator, value, validator) {
+const validateEmpty = function (interpolator, value, validator) {
   const emptyObject = {};
   let changed = interpolator(emptyObject, value);
   validator(emptyObject);
@@ -20,8 +20,8 @@ const validateEmpty = function(interpolator, value, validator) {
   changed = interpolator(emptyObject, value);
   expect(changed).toBe(false);
 };
-describe('buildStyleInterpolator', function() {
-  it('should linearly interpolate without extrapolating', function() {
+describe('buildStyleInterpolator', function () {
+  it('should linearly interpolate without extrapolating', function () {
     const testAnim = {
       opacity: {
         from: 100,
@@ -45,35 +45,35 @@ describe('buildStyleInterpolator', function() {
       },
     };
     const interpolator = buildStyleInterpolator(testAnim);
-    validateEmpty(interpolator, 0, function(res) {
+    validateEmpty(interpolator, 0, function (res) {
       expect(res).toEqual({
         opacity: 100,
         left: 200,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, 1, function(res) {
+    validateEmpty(interpolator, 1, function (res) {
       expect(res).toEqual({
         opacity: 200,
         left: 300,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, -0.1, function(res) {
+    validateEmpty(interpolator, -0.1, function (res) {
       expect(res).toEqual({
         opacity: 100,
         left: 200,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, 1.1, function(res) {
+    validateEmpty(interpolator, 1.1, function (res) {
       expect(res).toEqual({
         opacity: 200,
         left: 300,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, 0.5, function(res) {
+    validateEmpty(interpolator, 0.5, function (res) {
       expect(res).toEqual({
         opacity: 150,
         left: 250,
@@ -81,7 +81,7 @@ describe('buildStyleInterpolator', function() {
       });
     });
   });
-  it('should linearly interpolate with extrapolating', function() {
+  it('should linearly interpolate with extrapolating', function () {
     const testAnim = {
       opacity: {
         from: 100,
@@ -107,35 +107,35 @@ describe('buildStyleInterpolator', function() {
       },
     };
     const interpolator = buildStyleInterpolator(testAnim);
-    validateEmpty(interpolator, 0, function(res) {
+    validateEmpty(interpolator, 0, function (res) {
       expect(res).toEqual({
         opacity: 100,
         left: 200,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, 1, function(res) {
+    validateEmpty(interpolator, 1, function (res) {
       expect(res).toEqual({
         opacity: 200,
         left: 300,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, -0.1, function(res) {
+    validateEmpty(interpolator, -0.1, function (res) {
       expect(res).toEqual({
         opacity: 90,
         left: 190,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, 1.1, function(res) {
+    validateEmpty(interpolator, 1.1, function (res) {
       expect(res).toEqual({
         opacity: 210,
         left: 310,
         top: 23.5,
       });
     });
-    validateEmpty(interpolator, 0.5, function(res) {
+    validateEmpty(interpolator, 0.5, function (res) {
       expect(res).toEqual({
         opacity: 150,
         left: 250,
@@ -143,7 +143,7 @@ describe('buildStyleInterpolator', function() {
       });
     });
   });
-  it('should round accordingly', function() {
+  it('should round accordingly', function () {
     const testAnim = {
       opacity: {
         from: 0,
@@ -156,38 +156,38 @@ describe('buildStyleInterpolator', function() {
       },
     };
     const interpolator = buildStyleInterpolator(testAnim);
-    validateEmpty(interpolator, 0, function(res) {
+    validateEmpty(interpolator, 0, function (res) {
       expect(res).toEqual({
         opacity: 0,
       });
     });
-    validateEmpty(interpolator, 0.5, function(res) {
+    validateEmpty(interpolator, 0.5, function (res) {
       expect(res).toEqual({
         opacity: 0.5,
       });
     });
-    validateEmpty(interpolator, 0.4, function(res) {
+    validateEmpty(interpolator, 0.4, function (res) {
       expect(res).toEqual({
         opacity: 0.5,
       });
     });
-    validateEmpty(interpolator, 0.26, function(res) {
+    validateEmpty(interpolator, 0.26, function (res) {
       expect(res).toEqual({
         opacity: 0.5,
       });
     });
-    validateEmpty(interpolator, 0.74, function(res) {
+    validateEmpty(interpolator, 0.74, function (res) {
       expect(res).toEqual({
         opacity: 0.5,
       });
     });
-    validateEmpty(interpolator, 0.76, function(res) {
+    validateEmpty(interpolator, 0.76, function (res) {
       expect(res).toEqual({
         opacity: 1.0,
       });
     });
   });
-  it('should detect changes correctly', function() {
+  it('should detect changes correctly', function () {
     const testAnim = {
       opacity: {
         from: 0,
@@ -228,7 +228,7 @@ describe('buildStyleInterpolator', function() {
     });
     expect(res).toBe(false);
   });
-  it('should handle identity', function() {
+  it('should handle identity', function () {
     const testAnim = {
       opacity: {
         type: 'identity',
@@ -249,7 +249,7 @@ describe('buildStyleInterpolator', function() {
     });
     expect(res).toBe(false);
   });
-  it('should translate', function() {
+  it('should translate', function () {
     const testAnim = {
       transformTranslate: {
         from: {x: 1, y: 10, z: 100},
@@ -271,7 +271,7 @@ describe('buildStyleInterpolator', function() {
     });
     expect(res).toBe(true);
   });
-  it('should scale', function() {
+  it('should scale', function () {
     const testAnim = {
       transformScale: {
         from: {x: 1, y: 10, z: 100},
@@ -293,7 +293,7 @@ describe('buildStyleInterpolator', function() {
     });
     expect(res).toBe(true);
   });
-  it('should combine scale and translate', function() {
+  it('should combine scale and translate', function () {
     const testAnim = {
       transformScale: {
         from: {x: 1, y: 10, z: 100},
@@ -322,7 +322,7 @@ describe('buildStyleInterpolator', function() {
     });
     expect(res).toBe(true);
   });
-  it('should step', function() {
+  it('should step', function () {
     const testAnim = {
       opacity: {
         threshold: 13,
diff --git a/Libraries/Utilities/__tests__/codegenNativeComponent-test.js b/Libraries/Utilities/__tests__/codegenNativeComponent-test.js
index f9acf7fe816..2572f61dafa 100644
--- a/Libraries/Utilities/__tests__/codegenNativeComponent-test.js
+++ b/Libraries/Utilities/__tests__/codegenNativeComponent-test.js
@@ -20,11 +20,11 @@ const {UIManager} = require('react-native');
 jest.unmock('../../ReactNative/requireNativeComponent');
 jest.mock(
   '../../Renderer/shims/createReactNativeComponentClass',
-  () => componentName => componentName,
+  () => (componentName) => componentName,
 );
 jest
   .spyOn(UIManager, 'getViewManagerConfig')
-  .mockImplementation(componentName =>
+  .mockImplementation((componentName) =>
     componentName.includes('ComponentNameDoesNotExist') ? false : true,
   );
 
diff --git a/Libraries/Utilities/__tests__/deepFreezeAndThrowOnMutationInDev-test.js b/Libraries/Utilities/__tests__/deepFreezeAndThrowOnMutationInDev-test.js
index b813f2fbbd5..65cf9cd6b21 100644
--- a/Libraries/Utilities/__tests__/deepFreezeAndThrowOnMutationInDev-test.js
+++ b/Libraries/Utilities/__tests__/deepFreezeAndThrowOnMutationInDev-test.js
@@ -10,7 +10,7 @@
 
 const deepFreezeAndThrowOnMutationInDev = require('../deepFreezeAndThrowOnMutationInDev');
 
-describe('deepFreezeAndThrowOnMutationInDev', function() {
+describe('deepFreezeAndThrowOnMutationInDev', function () {
   it('should be a noop on non object values', () => {
     __DEV__ = true;
     expect(() => deepFreezeAndThrowOnMutationInDev('')).not.toThrow();
diff --git a/Libraries/Utilities/__tests__/mapWithSeparator-test.js b/Libraries/Utilities/__tests__/mapWithSeparator-test.js
index 1adbc2bcb15..e1743c6c750 100644
--- a/Libraries/Utilities/__tests__/mapWithSeparator-test.js
+++ b/Libraries/Utilities/__tests__/mapWithSeparator-test.js
@@ -17,10 +17,10 @@ describe('mapWithSeparator', () => {
     const array = [1, 2, 3];
     const result = mapWithSeparator(
       array,
-      function(value) {
+      function (value) {
         return value * 2;
       },
-      function() {
+      function () {
         return 0;
       },
     );
@@ -31,10 +31,10 @@ describe('mapWithSeparator', () => {
     const array = [1, 2, 3];
     const result = mapWithSeparator(
       array,
-      function(value, index) {
+      function (value, index) {
         return index;
       },
-      function(index) {
+      function (index) {
         return index;
       },
     );
@@ -45,10 +45,10 @@ describe('mapWithSeparator', () => {
     const array = [3, 2, 1];
     const result = mapWithSeparator(
       array,
-      function(value, index, arr) {
+      function (value, index, arr) {
         return arr[index];
       },
-      function(index) {
+      function (index) {
         return index;
       },
     );
@@ -59,10 +59,10 @@ describe('mapWithSeparator', () => {
     const array = [];
     const result = mapWithSeparator(
       array,
-      function(value) {
+      function (value) {
         return value * 2;
       },
-      function() {
+      function () {
         return 0;
       },
     );
diff --git a/Libraries/Utilities/__tests__/setAndForwardRef-test.js b/Libraries/Utilities/__tests__/setAndForwardRef-test.js
index 36183139806..ea640d6dd5b 100644
--- a/Libraries/Utilities/__tests__/setAndForwardRef-test.js
+++ b/Libraries/Utilities/__tests__/setAndForwardRef-test.js
@@ -40,7 +40,7 @@ describe('setAndForwardRef', () => {
     _nativeRef: ?React.ElementRef<typeof ForwardedComponent> = null;
     _setNativeRef = setAndForwardRef({
       getForwardedRef: () => this.props.forwardedRef,
-      setLocalRef: ref => {
+      setLocalRef: (ref) => {
         this._nativeRef = ref;
       },
     });
@@ -70,7 +70,7 @@ describe('setAndForwardRef', () => {
 
     ReactTestRenderer.create(
       <TestComponentWithRef
-        ref={ref => {
+        ref={(ref) => {
           testRef = ref;
         }}
       />,
diff --git a/Libraries/Utilities/__tests__/stringifySafe-test.js b/Libraries/Utilities/__tests__/stringifySafe-test.js
index 9ab85e566cb..3d1b5b85094 100644
--- a/Libraries/Utilities/__tests__/stringifySafe-test.js
+++ b/Libraries/Utilities/__tests__/stringifySafe-test.js
@@ -27,7 +27,7 @@ describe('stringifySafe', () => {
   });
 
   it('stringifySafe stringifies function values', () => {
-    expect(stringifySafe(function() {})).toEqual('function () {}');
+    expect(stringifySafe(function () {})).toEqual('function () {}');
   });
 
   it('stringifySafe stringifies non-circular objects', () => {
diff --git a/Libraries/Utilities/buildStyleInterpolator.js b/Libraries/Utilities/buildStyleInterpolator.js
index a7ab6d89385..41cc510356d 100644
--- a/Libraries/Utilities/buildStyleInterpolator.js
+++ b/Libraries/Utilities/buildStyleInterpolator.js
@@ -21,7 +21,7 @@ const InitialOperationField = {
 };
 
 const InterpolateMatrix = {
-  transformScale: function(mat, x, y, z) {
+  transformScale: function (mat, x, y, z) {
     mat[0] = mat[0] * x;
     mat[1] = mat[1] * x;
     mat[2] = mat[2] * x;
@@ -35,7 +35,7 @@ const InterpolateMatrix = {
     mat[10] = mat[10] * z;
     mat[11] = mat[11] * z;
   },
-  transformTranslate: function(mat, x, y, z) {
+  transformTranslate: function (mat, x, y, z) {
     mat[12] = mat[0] * x + mat[4] * y + mat[8] * z + mat[12];
     mat[13] = mat[1] * x + mat[5] * y + mat[9] * z + mat[13];
     mat[14] = mat[2] * x + mat[6] * y + mat[10] * z + mat[14];
@@ -43,7 +43,7 @@ const InterpolateMatrix = {
   },
 };
 
-const computeNextValLinear = function(anim, from, to, value) {
+const computeNextValLinear = function (anim, from, to, value) {
   const hasRoundRatio = 'round' in anim;
   const roundRatio = anim.round;
   let ratio = (value - anim.min) / (anim.max - anim.min);
@@ -60,11 +60,11 @@ const computeNextValLinear = function(anim, from, to, value) {
   return nextVal;
 };
 
-const computeNextValLinearScalar = function(anim, value) {
+const computeNextValLinearScalar = function (anim, value) {
   return computeNextValLinear(anim, anim.from, anim.to, value);
 };
 
-const setNextValAndDetectChange = function(result, name, nextVal, didChange) {
+const setNextValAndDetectChange = function (result, name, nextVal, didChange) {
   if (!didChange) {
     const prevVal = result[name];
     result[name] = nextVal;
@@ -75,7 +75,7 @@ const setNextValAndDetectChange = function(result, name, nextVal, didChange) {
   return didChange;
 };
 
-const initIdentity = function(mat) {
+const initIdentity = function (mat) {
   mat[0] = 1;
   mat[1] = 0;
   mat[2] = 0;
@@ -94,7 +94,7 @@ const initIdentity = function(mat) {
   mat[15] = 1;
 };
 
-const computeNextMatrixOperationField = function(
+const computeNextMatrixOperationField = function (
   anim,
   name,
   dim,
@@ -108,7 +108,7 @@ const computeNextMatrixOperationField = function(
   }
 };
 
-const computeTransform = function(
+const computeTransform = function (
   anim,
   name,
   value,
@@ -171,7 +171,7 @@ const computeTransform = function(
  * @return {function} Function accepting style object, that mutates that style
  * object and returns a boolean describing if any update was actually applied.
  */
-const buildStyleInterpolator = function(anims) {
+const buildStyleInterpolator = function (anims) {
   function styleInterpolator(result, value) {
     let didChange = false;
     let didMatrix = false;
diff --git a/Libraries/Utilities/codegenNativeCommands.js b/Libraries/Utilities/codegenNativeCommands.js
index 1a7532cfddc..4fca56a63ba 100644
--- a/Libraries/Utilities/codegenNativeCommands.js
+++ b/Libraries/Utilities/codegenNativeCommands.js
@@ -19,7 +19,7 @@ type Options<T = string> = $ReadOnly<{|
 function codegenNativeCommands<T: {...}>(options: Options<$Keys<T>>): T {
   const commandObj = {};
 
-  options.supportedCommands.forEach(command => {
+  options.supportedCommands.forEach((command) => {
     commandObj[command] = (ref, ...args) => {
       dispatchCommand(ref, command, args);
     };
diff --git a/Libraries/Utilities/codegenNativeComponent.js b/Libraries/Utilities/codegenNativeComponent.js
index 3847be3b4db..63e3a1c8237 100644
--- a/Libraries/Utilities/codegenNativeComponent.js
+++ b/Libraries/Utilities/codegenNativeComponent.js
@@ -45,8 +45,9 @@ function codegenNativeComponent<Props>(
       componentNameInUse = options.paperComponentNameDeprecated;
     } else {
       throw new Error(
-        `Failed to find native component for either ${componentName} or ${options.paperComponentNameDeprecated ||
-          '(unknown)'}`,
+        `Failed to find native component for either ${componentName} or ${
+          options.paperComponentNameDeprecated || '(unknown)'
+        }`,
       );
     }
   }
diff --git a/Libraries/Utilities/createPerformanceLogger.js b/Libraries/Utilities/createPerformanceLogger.js
index 2bfdb342581..bbd62ef0703 100644
--- a/Libraries/Utilities/createPerformanceLogger.js
+++ b/Libraries/Utilities/createPerformanceLogger.js
@@ -163,7 +163,7 @@ function createPerformanceLogger(): IPerformanceLogger {
     },
 
     clearExceptTimespans(keys: Array<string>) {
-      this._timespans = Object.keys(this._timespans).reduce(function(
+      this._timespans = Object.keys(this._timespans).reduce(function (
         previous,
         key,
       ) {
diff --git a/Libraries/Utilities/differ/__tests__/deepDiffer-test.js b/Libraries/Utilities/differ/__tests__/deepDiffer-test.js
index a2aca448f33..bedf0b3c14b 100644
--- a/Libraries/Utilities/differ/__tests__/deepDiffer-test.js
+++ b/Libraries/Utilities/differ/__tests__/deepDiffer-test.js
@@ -12,7 +12,7 @@
 
 const deepDiffer = require('../deepDiffer');
 
-describe('deepDiffer', function() {
+describe('deepDiffer', function () {
   it('should diff primitives of the same type', () => {
     expect(deepDiffer(1, 2)).toBe(true);
     expect(deepDiffer(42, 42)).toBe(false);
@@ -129,13 +129,23 @@ describe('deepDiffer', function() {
     ).toBe(false);
   });
   it('should consider all functions equal', () => {
-    expect(deepDiffer(() => {}, x => x)).toBe(false);
+    expect(
+      deepDiffer(
+        () => {},
+        (x) => x,
+      ),
+    ).toBe(false);
     const f = () => {};
     expect(deepDiffer(f, f)).toBe(false);
   });
   it('should compare functions if unsafelyIgnoreFunctions is false', () => {
     expect(
-      deepDiffer(() => {}, x => x, undefined, {unsafelyIgnoreFunctions: false}),
+      deepDiffer(
+        () => {},
+        (x) => x,
+        undefined,
+        {unsafelyIgnoreFunctions: false},
+      ),
     ).toBe(true);
     const f = () => {};
     expect(deepDiffer(f, f, undefined, {unsafelyIgnoreFunctions: false})).toBe(
@@ -143,9 +153,13 @@ describe('deepDiffer', function() {
     );
 
     // shorthand, omitting maxDepth
-    expect(deepDiffer(() => {}, x => x, {unsafelyIgnoreFunctions: false})).toBe(
-      true,
-    );
+    expect(
+      deepDiffer(
+        () => {},
+        (x) => x,
+        {unsafelyIgnoreFunctions: false},
+      ),
+    ).toBe(true);
     expect(deepDiffer(f, f, {unsafelyIgnoreFunctions: false})).toBe(false);
   });
   it('should log when implicitly considering two different functions equal', () => {
diff --git a/Libraries/Utilities/differ/__tests__/matricesDiffer-test.js b/Libraries/Utilities/differ/__tests__/matricesDiffer-test.js
index 26cc35ce3f5..9f740a498ce 100644
--- a/Libraries/Utilities/differ/__tests__/matricesDiffer-test.js
+++ b/Libraries/Utilities/differ/__tests__/matricesDiffer-test.js
@@ -12,7 +12,7 @@
 
 const matricesDiffer = require('../matricesDiffer');
 
-describe('matricesDiffer', function() {
+describe('matricesDiffer', function () {
   it('diffs matrices with single element', () => {
     var x = [1];
     var y = [2];
diff --git a/Libraries/Utilities/differ/deepDiffer.js b/Libraries/Utilities/differ/deepDiffer.js
index ff8bd4628d1..d6dc88c8cb3 100644
--- a/Libraries/Utilities/differ/deepDiffer.js
+++ b/Libraries/Utilities/differ/deepDiffer.js
@@ -25,7 +25,7 @@ function unstable_setLogListeners(listeners: ?LogListeners) {
 /*
  * @returns {bool} true if different, false if equal
  */
-const deepDiffer = function(
+const deepDiffer = function (
   one: any,
   two: any,
   maxDepthOrOptions: Options | number = -1,
diff --git a/Libraries/Utilities/differ/insetsDiffer.js b/Libraries/Utilities/differ/insetsDiffer.js
index 48aa7cac3c8..89b0f33a739 100644
--- a/Libraries/Utilities/differ/insetsDiffer.js
+++ b/Libraries/Utilities/differ/insetsDiffer.js
@@ -25,7 +25,7 @@ const dummyInsets = {
   bottom: undefined,
 };
 
-const insetsDiffer = function(one: Inset, two: Inset): boolean {
+const insetsDiffer = function (one: Inset, two: Inset): boolean {
   one = one || dummyInsets;
   two = two || dummyInsets;
   return (
diff --git a/Libraries/Utilities/differ/matricesDiffer.js b/Libraries/Utilities/differ/matricesDiffer.js
index 1726ad361e3..51bd170a03b 100644
--- a/Libraries/Utilities/differ/matricesDiffer.js
+++ b/Libraries/Utilities/differ/matricesDiffer.js
@@ -18,7 +18,7 @@
  * @param {MatrixMath.Matrix} two Second matrix.
  * @return {boolean} Whether or not the two matrices differ.
  */
-const matricesDiffer = function(one, two) {
+const matricesDiffer = function (one, two) {
   if (one === two) {
     return false;
   }
diff --git a/Libraries/Utilities/differ/pointsDiffer.js b/Libraries/Utilities/differ/pointsDiffer.js
index 28d94a3b706..7250ac9ecac 100644
--- a/Libraries/Utilities/differ/pointsDiffer.js
+++ b/Libraries/Utilities/differ/pointsDiffer.js
@@ -18,7 +18,7 @@ type Point = {
 
 const dummyPoint = {x: undefined, y: undefined};
 
-const pointsDiffer = function(one: ?Point, two: ?Point): boolean {
+const pointsDiffer = function (one: ?Point, two: ?Point): boolean {
   one = one || dummyPoint;
   two = two || dummyPoint;
   return one !== two && (one.x !== two.x || one.y !== two.y);
diff --git a/Libraries/Utilities/differ/sizesDiffer.js b/Libraries/Utilities/differ/sizesDiffer.js
index 63ab71d3243..6b38bf7d46e 100644
--- a/Libraries/Utilities/differ/sizesDiffer.js
+++ b/Libraries/Utilities/differ/sizesDiffer.js
@@ -11,7 +11,7 @@
 
 const dummySize = {width: undefined, height: undefined};
 
-const sizesDiffer = function(one, two) {
+const sizesDiffer = function (one, two) {
   one = one || dummySize;
   two = two || dummySize;
   return one !== two && (one.width !== two.width || one.height !== two.height);
diff --git a/Libraries/Utilities/logError.js b/Libraries/Utilities/logError.js
index 45252c6d0f6..c8322d34a72 100644
--- a/Libraries/Utilities/logError.js
+++ b/Libraries/Utilities/logError.js
@@ -15,7 +15,7 @@
  * `console.error` as a failure callback - it's not properly bound.  If passes an
  * `Error` object, it will print the message and stack.
  */
-const logError = function(...args: $ReadOnlyArray<mixed>) {
+const logError = function (...args: $ReadOnlyArray<mixed>) {
   if (args.length === 1 && args[0] instanceof Error) {
     const err = args[0];
     console.error('Error: "' + err.message + '".  Stack:\n' + err.stack);
diff --git a/Libraries/Utilities/mergeIntoFast.js b/Libraries/Utilities/mergeIntoFast.js
index 663f897ae5d..5a1a27c2e23 100644
--- a/Libraries/Utilities/mergeIntoFast.js
+++ b/Libraries/Utilities/mergeIntoFast.js
@@ -17,7 +17,7 @@
  * @param {object} one Object to assign to.
  * @param {object} two Object to assign from.
  */
-const mergeIntoFast = function(one: Object, two: Object): void {
+const mergeIntoFast = function (one: Object, two: Object): void {
   for (const keyTwo in two) {
     one[keyTwo] = two[keyTwo];
   }
diff --git a/Libraries/Utilities/stringifySafe.js b/Libraries/Utilities/stringifySafe.js
index effeedcd299..7a0a4b4de43 100644
--- a/Libraries/Utilities/stringifySafe.js
+++ b/Libraries/Utilities/stringifySafe.js
@@ -21,7 +21,7 @@ export function createStringifySafeWithLimits(limits: {|
   maxStringLimit?: number,
   maxArrayLimit?: number,
   maxObjectKeysLimit?: number,
-|}): mixed => string {
+|}): (mixed) => string {
   const {
     maxDepth = Number.POSITIVE_INFINITY,
     maxStringLimit = Number.POSITIVE_INFINITY,
@@ -111,7 +111,7 @@ export function createStringifySafeWithLimits(limits: {|
   };
 }
 
-const stringifySafe: mixed => string = createStringifySafeWithLimits({
+const stringifySafe: (mixed) => string = createStringifySafeWithLimits({
   maxDepth: 10,
   maxStringLimit: 100,
   maxArrayLimit: 50,
diff --git a/Libraries/Utilities/truncate.js b/Libraries/Utilities/truncate.js
index fb3814b4a5a..a06371a8052 100644
--- a/Libraries/Utilities/truncate.js
+++ b/Libraries/Utilities/truncate.js
@@ -24,7 +24,7 @@ const defaultOptions = {
 };
 
 // maxChars (including ellipsis)
-const truncate = function(
+const truncate = function (
   str: ?string,
   maxChars: number,
   options?: truncateOptions,
diff --git a/Libraries/Utilities/useColorScheme.js b/Libraries/Utilities/useColorScheme.js
index 0b8cfef8396..e72b2453112 100644
--- a/Libraries/Utilities/useColorScheme.js
+++ b/Libraries/Utilities/useColorScheme.js
@@ -19,7 +19,7 @@ export default function useColorScheme(): ?ColorSchemeName {
   const subscription = useMemo(
     () => ({
       getCurrentValue: () => Appearance.getColorScheme(),
-      subscribe: callback => {
+      subscribe: (callback) => {
         Appearance.addChangeListener(callback);
         return () => Appearance.removeChangeListener(callback);
       },
diff --git a/Libraries/Utilities/verifyComponentAttributeEquivalence.js b/Libraries/Utilities/verifyComponentAttributeEquivalence.js
index 10dbe98dd0b..b3bff1cb1f6 100644
--- a/Libraries/Utilities/verifyComponentAttributeEquivalence.js
+++ b/Libraries/Utilities/verifyComponentAttributeEquivalence.js
@@ -47,7 +47,7 @@ function verifyComponentAttributeEquivalence(
     const nativeAttributes = getNativeComponentAttributes(componentName);
 
     ['validAttributes', 'bubblingEventTypes', 'directEventTypes'].forEach(
-      prop => {
+      (prop) => {
         const diffKeys = Object.keys(
           lefthandObjectDiff(nativeAttributes[prop], config[prop]),
         );
@@ -111,7 +111,7 @@ export function getConfigWithoutViewProps(
   }
 
   return Object.keys(viewConfig[propName])
-    .filter(prop => !ReactNativeViewViewConfig[propName][prop])
+    .filter((prop) => !ReactNativeViewViewConfig[propName][prop])
     .reduce((obj, prop) => {
       obj[prop] = viewConfig[propName][prop];
       return obj;
diff --git a/Libraries/Vibration/Vibration.js b/Libraries/Vibration/Vibration.js
index ff3a755a05e..318ddb2e690 100644
--- a/Libraries/Vibration/Vibration.js
+++ b/Libraries/Vibration/Vibration.js
@@ -69,7 +69,7 @@ const Vibration = {
    *
    * See https://reactnative.dev/docs/vibration.html#vibrate
    */
-  vibrate: function(
+  vibrate: function (
     pattern: number | Array<number> = 400,
     repeat: boolean = false,
   ) {
@@ -99,7 +99,7 @@ const Vibration = {
    *
    * See https://reactnative.dev/docs/vibration.html#cancel
    */
-  cancel: function() {
+  cancel: function () {
     if (Platform.OS === 'ios') {
       _vibrating = false;
     } else {
diff --git a/Libraries/WebSocket/WebSocket.js b/Libraries/WebSocket/WebSocket.js
index 0b051c48e4c..1d75086dd03 100644
--- a/Libraries/WebSocket/WebSocket.js
+++ b/Libraries/WebSocket/WebSocket.js
@@ -209,13 +209,13 @@ class WebSocket extends (EventTarget(...WEBSOCKET_EVENTS): any) {
   }
 
   _unregisterEvents(): void {
-    this._subscriptions.forEach(e => e.remove());
+    this._subscriptions.forEach((e) => e.remove());
     this._subscriptions = [];
   }
 
   _registerEvents(): void {
     this._subscriptions = [
-      this._eventEmitter.addListener('websocketMessage', ev => {
+      this._eventEmitter.addListener('websocketMessage', (ev) => {
         if (ev.id !== this._socketId) {
           return;
         }
@@ -230,7 +230,7 @@ class WebSocket extends (EventTarget(...WEBSOCKET_EVENTS): any) {
         }
         this.dispatchEvent(new WebSocketEvent('message', {data}));
       }),
-      this._eventEmitter.addListener('websocketOpen', ev => {
+      this._eventEmitter.addListener('websocketOpen', (ev) => {
         if (ev.id !== this._socketId) {
           return;
         }
@@ -238,7 +238,7 @@ class WebSocket extends (EventTarget(...WEBSOCKET_EVENTS): any) {
         this.protocol = ev.protocol;
         this.dispatchEvent(new WebSocketEvent('open'));
       }),
-      this._eventEmitter.addListener('websocketClosed', ev => {
+      this._eventEmitter.addListener('websocketClosed', (ev) => {
         if (ev.id !== this._socketId) {
           return;
         }
@@ -252,7 +252,7 @@ class WebSocket extends (EventTarget(...WEBSOCKET_EVENTS): any) {
         this._unregisterEvents();
         this.close();
       }),
-      this._eventEmitter.addListener('websocketFailed', ev => {
+      this._eventEmitter.addListener('websocketFailed', (ev) => {
         if (ev.id !== this._socketId) {
           return;
         }
diff --git a/Libraries/WebSocket/WebSocketInterceptor.js b/Libraries/WebSocket/WebSocketInterceptor.js
index 6c371c1028c..c2db4faf769 100644
--- a/Libraries/WebSocket/WebSocketInterceptor.js
+++ b/Libraries/WebSocket/WebSocketInterceptor.js
@@ -94,7 +94,7 @@ const WebSocketInterceptor = {
   },
 
   _unregisterEvents() {
-    subscriptions.forEach(e => e.remove());
+    subscriptions.forEach((e) => e.remove());
     subscriptions = [];
   },
 
@@ -103,7 +103,7 @@ const WebSocketInterceptor = {
    */
   _registerEvents() {
     subscriptions = [
-      eventEmitter.addListener('websocketMessage', ev => {
+      eventEmitter.addListener('websocketMessage', (ev) => {
         if (onMessageCallback) {
           onMessageCallback(
             ev.id,
@@ -113,17 +113,17 @@ const WebSocketInterceptor = {
           );
         }
       }),
-      eventEmitter.addListener('websocketOpen', ev => {
+      eventEmitter.addListener('websocketOpen', (ev) => {
         if (onOpenCallback) {
           onOpenCallback(ev.id);
         }
       }),
-      eventEmitter.addListener('websocketClosed', ev => {
+      eventEmitter.addListener('websocketClosed', (ev) => {
         if (onCloseCallback) {
           onCloseCallback(ev.id, {code: ev.code, reason: ev.reason});
         }
       }),
-      eventEmitter.addListener('websocketFailed', ev => {
+      eventEmitter.addListener('websocketFailed', (ev) => {
         if (onErrorCallback) {
           onErrorCallback(ev.id, {message: ev.message});
         }
@@ -141,7 +141,7 @@ const WebSocketInterceptor = {
     // Override `connect` method for all RCTWebSocketModule requests
     // to intercept the request url, protocols, options and socketId,
     // then pass them through the `connectCallback`.
-    NativeWebSocketModule.connect = function(
+    NativeWebSocketModule.connect = function (
       url,
       protocols,
       options,
@@ -155,7 +155,7 @@ const WebSocketInterceptor = {
 
     // Override `send` method for all RCTWebSocketModule requests to intercept
     // the data sent, then pass them through the `sendCallback`.
-    NativeWebSocketModule.send = function(data, socketId) {
+    NativeWebSocketModule.send = function (data, socketId) {
       if (sendCallback) {
         sendCallback(data, socketId);
       }
@@ -164,7 +164,7 @@ const WebSocketInterceptor = {
 
     // Override `sendBinary` method for all RCTWebSocketModule requests to
     // intercept the data sent, then pass them through the `sendCallback`.
-    NativeWebSocketModule.sendBinary = function(data, socketId) {
+    NativeWebSocketModule.sendBinary = function (data, socketId) {
       if (sendCallback) {
         sendCallback(WebSocketInterceptor._arrayBufferToString(data), socketId);
       }
@@ -173,7 +173,7 @@ const WebSocketInterceptor = {
 
     // Override `close` method for all RCTWebSocketModule requests to intercept
     // the close information, then pass them through the `closeCallback`.
-    NativeWebSocketModule.close = function() {
+    NativeWebSocketModule.close = function () {
       if (closeCallback) {
         if (arguments.length === 3) {
           closeCallback(arguments[0], arguments[1], arguments[2]);
diff --git a/Libraries/WebSocket/__tests__/WebSocket-test.js b/Libraries/WebSocket/__tests__/WebSocket-test.js
index 5b50783cdab..4f3d27f0a93 100644
--- a/Libraries/WebSocket/__tests__/WebSocket-test.js
+++ b/Libraries/WebSocket/__tests__/WebSocket-test.js
@@ -19,7 +19,7 @@ jest.setMock('../../BatchedBridge/NativeModules', {
 
 const WebSocket = require('../WebSocket');
 
-describe('WebSocket', function() {
+describe('WebSocket', function () {
   it('should have connection lifecycle constants defined on the class', () => {
     expect(WebSocket.CONNECTING).toEqual(0);
   });
diff --git a/Libraries/__flowtests__/ReactNativeTypes-flowtest.js b/Libraries/__flowtests__/ReactNativeTypes-flowtest.js
index e6c0bb124d5..c56e453d587 100644
--- a/Libraries/__flowtests__/ReactNativeTypes-flowtest.js
+++ b/Libraries/__flowtests__/ReactNativeTypes-flowtest.js
@@ -20,7 +20,7 @@ function takesHostComponentInstance(
 const MyHostComponent = (('Host': any): HostComponent<mixed>);
 
 <MyHostComponent
-  ref={hostComponentRef => {
+  ref={(hostComponentRef) => {
     takesHostComponentInstance(hostComponentRef);
 
     if (hostComponentRef == null) {
diff --git a/Libraries/polyfills/Object.es7.js b/Libraries/polyfills/Object.es7.js
index 19ff4bb7d14..80bfb16623f 100644
--- a/Libraries/polyfills/Object.es7.js
+++ b/Libraries/polyfills/Object.es7.js
@@ -9,7 +9,7 @@
  * @nolint
  */
 
-(function() {
+(function () {
   'use strict';
 
   const hasOwnProperty = Object.prototype.hasOwnProperty;
@@ -19,7 +19,7 @@
    * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries
    */
   if (typeof Object.entries !== 'function') {
-    Object.entries = function(object) {
+    Object.entries = function (object) {
       // `null` and `undefined` values are not allowed.
       if (object == null) {
         throw new TypeError('Object.entries called on non-object');
@@ -40,7 +40,7 @@
    * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values
    */
   if (typeof Object.values !== 'function') {
-    Object.values = function(object) {
+    Object.values = function (object) {
       // `null` and `undefined` values are not allowed.
       if (object == null) {
         throw new TypeError('Object.values called on non-object');
diff --git a/Libraries/polyfills/__tests__/Object.es7-test.js b/Libraries/polyfills/__tests__/Object.es7-test.js
index a4aa966e646..c51c32c7f9a 100644
--- a/Libraries/polyfills/__tests__/Object.es7-test.js
+++ b/Libraries/polyfills/__tests__/Object.es7-test.js
@@ -48,7 +48,10 @@ describe('Object (ES7)', () => {
       expect(Object.entries(foo)).toEqual([['x', 10]]);
 
       const bar = {x: 10, y: 20};
-      expect(Object.entries(bar)).toEqual([['x', 10], ['y', 20]]);
+      expect(Object.entries(bar)).toEqual([
+        ['x', 10],
+        ['y', 20],
+      ]);
     });
 
     it('should work with proto-less objects', () => {
@@ -73,7 +76,10 @@ describe('Object (ES7)', () => {
     });
 
     it('should convert to object primitive string', () => {
-      expect(Object.entries('ab')).toEqual([['0', 'a'], ['1', 'b']]);
+      expect(Object.entries('ab')).toEqual([
+        ['0', 'a'],
+        ['1', 'b'],
+      ]);
     });
   });
 
diff --git a/Libraries/polyfills/console.js b/Libraries/polyfills/console.js
index 585a1a3c872..08b81e99ba5 100644
--- a/Libraries/polyfills/console.js
+++ b/Libraries/polyfills/console.js
@@ -15,7 +15,7 @@
  * This pipes all of our console logging functions to native logging so that
  * JavaScript errors in required modules show up in Xcode via NSLog.
  */
-const inspect = (function() {
+const inspect = (function () {
   // Copyright Joyent, Inc. and other Node contributors.
   //
   // Permission is hereby granted, free of charge, to any person obtaining a
@@ -55,7 +55,7 @@ const inspect = (function() {
   function arrayToHash(array) {
     var hash = {};
 
-    array.forEach(function(val, idx) {
+    array.forEach(function (val, idx) {
       hash[val] = true;
     });
 
@@ -65,9 +65,7 @@ const inspect = (function() {
   function formatValue(ctx, value, recurseTimes) {
     ctx.formatValueCalls++;
     if (ctx.formatValueCalls > 200) {
-      return `[TOO BIG formatValueCalls ${
-        ctx.formatValueCalls
-      } exceeded limit of 200]`;
+      return `[TOO BIG formatValueCalls ${ctx.formatValueCalls} exceeded limit of 200]`;
     }
 
     // Primitive types cannot have properties
@@ -155,7 +153,7 @@ const inspect = (function() {
     if (array) {
       output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
     } else {
-      output = keys.map(function(key) {
+      output = keys.map(function (key) {
         return formatProperty(
           ctx,
           value,
@@ -212,7 +210,7 @@ const inspect = (function() {
         output.push('');
       }
     }
-    keys.forEach(function(key) {
+    keys.forEach(function (key) {
       if (!key.match(/^\d+$/)) {
         output.push(
           formatProperty(ctx, value, recurseTimes, visibleKeys, key, true),
@@ -250,7 +248,7 @@ const inspect = (function() {
           if (array) {
             str = str
               .split('\n')
-              .map(function(line) {
+              .map(function (line) {
                 return '  ' + line;
               })
               .join('\n')
@@ -260,7 +258,7 @@ const inspect = (function() {
               '\n' +
               str
                 .split('\n')
-                .map(function(line) {
+                .map(function (line) {
                   return '   ' + line;
                 })
                 .join('\n');
@@ -292,7 +290,7 @@ const inspect = (function() {
 
   function reduceToSingleString(output, base, braces) {
     var numLinesEst = 0;
-    var length = output.reduce(function(prev, cur) {
+    var length = output.reduce(function (prev, cur) {
       numLinesEst++;
       if (cur.indexOf('\n') >= 0) numLinesEst++;
       return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
@@ -398,13 +396,13 @@ INSPECTOR_LEVELS[LOG_LEVELS.error] = 'error';
 const INSPECTOR_FRAMES_TO_SKIP = __DEV__ ? 2 : 1;
 
 function getNativeLogFunction(level) {
-  return function() {
+  return function () {
     let str;
     if (arguments.length === 1 && typeof arguments[0] === 'string') {
       str = arguments[0];
     } else {
       str = Array.prototype.map
-        .call(arguments, function(arg) {
+        .call(arguments, function (arg) {
           return inspect(arg, {depth: 10});
         })
         .join(', ');
@@ -445,7 +443,7 @@ function getNativeLogFunction(level) {
 }
 
 function repeat(element, n) {
-  return Array.apply(null, Array(n)).map(function() {
+  return Array.apply(null, Array(n)).map(function () {
     return element;
   });
 }
@@ -474,7 +472,7 @@ function consoleTablePolyfill(rows) {
 
   // Convert each cell to a string. Also
   // figure out max cell width for each column
-  columns.forEach(function(k, i) {
+  columns.forEach(function (k, i) {
     columnWidths[i] = k.length;
     for (var j = 0; j < rows.length; j++) {
       var cellStr = (rows[j][k] || '?').toString();
@@ -487,7 +485,7 @@ function consoleTablePolyfill(rows) {
   // Join all elements in the row into a single string with | separators
   // (appends extra spaces to each cell to make separators  | aligned)
   function joinRow(row, space) {
-    var cells = row.map(function(cell, i) {
+    var cells = row.map(function (cell, i) {
       var extraSpaces = repeat(' ', columnWidths[i] - cell.length).join('');
       return cell + extraSpaces;
     });
@@ -495,7 +493,7 @@ function consoleTablePolyfill(rows) {
     return cells.join(space + '|' + space);
   }
 
-  var separators = columnWidths.map(function(columnWidth) {
+  var separators = columnWidths.map(function (columnWidth) {
     return repeat('-', columnWidth).join('');
   });
   var separatorRow = joinRow(separators, '-');
@@ -578,10 +576,10 @@ if (global.nativeLoggingHook) {
   // sometimes useful. Ex: on OS X, this will let you see rich output in
   // the Safari Web Inspector console.
   if (__DEV__ && originalConsole) {
-    Object.keys(console).forEach(methodName => {
+    Object.keys(console).forEach((methodName) => {
       const reactNativeMethod = console[methodName];
       if (originalConsole[methodName]) {
-        console[methodName] = function() {
+        console[methodName] = function () {
           // TODO(T43930203): remove this special case once originalConsole.assert properly checks
           // the condition
           if (methodName === 'assert') {
@@ -599,13 +597,15 @@ if (global.nativeLoggingHook) {
     // The following methods are not supported by this polyfill but
     // we still should pass them to original console if they are
     // supported by it.
-    ['clear', 'dir', 'dirxml', 'profile', 'profileEnd'].forEach(methodName => {
-      if (typeof originalConsole[methodName] === 'function') {
-        console[methodName] = function() {
-          originalConsole[methodName](...arguments);
-        };
-      }
-    });
+    ['clear', 'dir', 'dirxml', 'profile', 'profileEnd'].forEach(
+      (methodName) => {
+        if (typeof originalConsole[methodName] === 'function') {
+          console[methodName] = function () {
+            originalConsole[methodName](...arguments);
+          };
+        }
+      },
+    );
   }
 } else if (!global.console) {
   function stub() {}
diff --git a/Libraries/vendor/emitter/EventEmitter.js b/Libraries/vendor/emitter/EventEmitter.js
index f3c18c91058..f00e7c7dba9 100644
--- a/Libraries/vendor/emitter/EventEmitter.js
+++ b/Libraries/vendor/emitter/EventEmitter.js
@@ -159,7 +159,7 @@ class EventEmitter {
           // exist; it is not called for missing elements of the array."
           // https://www.ecma-international.org/ecma-262/9.0/index.html#sec-array.prototype.filter
           .filter(sparseFilterPredicate)
-          .map(subscription => subscription.listener)
+          .map((subscription) => subscription.listener)
       : [];
   }
 
diff --git a/RNTester/RNTesterUnitTests/RNTesterUnitTestsBundle.js b/RNTester/RNTesterUnitTests/RNTesterUnitTestsBundle.js
index 20f4cc8caa1..251bb2711b5 100644
--- a/RNTester/RNTesterUnitTests/RNTesterUnitTestsBundle.js
+++ b/RNTester/RNTesterUnitTests/RNTesterUnitTestsBundle.js
@@ -11,7 +11,7 @@
 
 // eslint-disable-next-line no-unused-vars
 const __fbBatchedBridge = {
-  flushedQueue: function() {
+  flushedQueue: function () {
     return null;
   },
 };
diff --git a/RNTester/e2e/e2e-helpers.js b/RNTester/e2e/e2e-helpers.js
index 9374e8254dc..590ae7fa299 100644
--- a/RNTester/e2e/e2e-helpers.js
+++ b/RNTester/e2e/e2e-helpers.js
@@ -19,6 +19,6 @@ exports.openComponentWithLabel = async (component, label) => {
 
 // Will open an individual example for a component
 // by filtering on the example title
-exports.openExampleWithTitle = async title => {
+exports.openExampleWithTitle = async (title) => {
   await element(by.id('example_search')).replaceText(title);
 };
diff --git a/RNTester/e2e/test-init.js b/RNTester/e2e/test-init.js
index 4e95bbe7c3e..15a0c180710 100644
--- a/RNTester/e2e/test-init.js
+++ b/RNTester/e2e/test-init.js
@@ -35,7 +35,7 @@ beforeAll(async () => {
   });
 });
 
-beforeEach(async function() {
+beforeEach(async function () {
   await adapter.beforeEach();
 });
 
diff --git a/RNTester/js/RNTesterApp.android.js b/RNTester/js/RNTesterApp.android.js
index d7371b4ee6a..76ce56964f1 100644
--- a/RNTester/js/RNTesterApp.android.js
+++ b/RNTester/js/RNTesterApp.android.js
@@ -64,7 +64,7 @@ const Header = ({
   ...
 }) => (
   <RNTesterThemeContext.Consumer>
-    {theme => {
+    {(theme) => {
       return (
         <View style={[styles.toolbar, {backgroundColor: theme.ToolbarColor}]}>
           <View style={styles.toolbarCenter}>
@@ -176,7 +176,7 @@ class RNTesterApp extends React.Component<Props, RNTesterNavigationState> {
   }
 
   componentDidMount() {
-    Linking.getInitialURL().then(url => {
+    Linking.getInitialURL().then((url) => {
       AsyncStorage.getItem(APP_STATE_KEY, (err, storedString) => {
         const exampleAction = URIActionMap(
           this.props.exampleFromAppetizeParams,
@@ -217,7 +217,7 @@ class RNTesterApp extends React.Component<Props, RNTesterNavigationState> {
            * found when making Flow check .android.js files. */
           this._overrideBackPressForDrawerLayout = false;
         }}
-        ref={drawer => {
+        ref={(drawer) => {
           /* $FlowFixMe(>=0.78.0 site=react_native_android_fb) This issue was
            * found when making Flow check .android.js files. */
           this.drawer = drawer;
@@ -249,7 +249,7 @@ class RNTesterApp extends React.Component<Props, RNTesterNavigationState> {
             onExampleExit={() => {
               this._handleAction(RNTesterActions.Back());
             }}
-            ref={example => {
+            ref={(example) => {
               /* $FlowFixMe(>=0.78.0 site=react_native_android_fb) This issue
                * was found when making Flow check .android.js files. */
               this._exampleRef = example;
@@ -264,7 +264,7 @@ class RNTesterApp extends React.Component<Props, RNTesterNavigationState> {
             onPressDrawer={() => this.drawer.openDrawer()}
             title={ExampleModule.title}
             module={ExampleModule}
-            exampleRef={example => {
+            exampleRef={(example) => {
               /* $FlowFixMe(>=0.78.0 site=react_native_android_fb) This issue
                * was found when making Flow check .android.js files. */
               this._exampleRef = example;
diff --git a/RNTester/js/RNTesterApp.ios.js b/RNTester/js/RNTesterApp.ios.js
index 1ae924c9b06..051d6acb20f 100644
--- a/RNTester/js/RNTesterApp.ios.js
+++ b/RNTester/js/RNTesterApp.ios.js
@@ -55,7 +55,7 @@ const Header = ({
   ...
 }) => (
   <RNTesterThemeContext.Consumer>
-    {theme => {
+    {(theme) => {
       return (
         <SafeAreaView
           style={[
@@ -145,7 +145,7 @@ class RNTesterApp extends React.Component<Props, RNTesterNavigationState> {
 
   componentDidMount() {
     this._mounted = true;
-    Linking.getInitialURL().then(url => {
+    Linking.getInitialURL().then((url) => {
       AsyncStorage.getItem(APP_STATE_KEY, (err, storedString) => {
         if (!this._mounted) {
           return;
@@ -160,7 +160,7 @@ class RNTesterApp extends React.Component<Props, RNTesterNavigationState> {
       });
     });
 
-    Linking.addEventListener('url', url => {
+    Linking.addEventListener('url', (url) => {
       this._handleAction(URIActionMap(url));
     });
   }
diff --git a/RNTester/js/components/ListExampleShared.js b/RNTester/js/components/ListExampleShared.js
index 522d72e3d93..fe867dd4ed3 100644
--- a/RNTester/js/components/ListExampleShared.js
+++ b/RNTester/js/components/ListExampleShared.js
@@ -228,7 +228,7 @@ function getItemLayout(
 function pressItem(context: Object, key: string) {
   const index = Number(key);
   const pressed = !context.state.data[index].pressed;
-  context.setState(state => {
+  context.setState((state) => {
     const newData = [...state.data];
     newData[index] = {
       ...state.data[index],
@@ -252,7 +252,7 @@ function renderSmallSwitchOption(
       <Switch
         style={styles.smallSwitch}
         value={context.state[key]}
-        onValueChange={value => context.setState({[key]: value})}
+        onValueChange={(value) => context.setState({[key]: value})}
       />
     </View>
   );
diff --git a/RNTester/js/components/RNTesterBlock.js b/RNTester/js/components/RNTesterBlock.js
index 1a0abba5eae..f67bbdb3153 100644
--- a/RNTester/js/components/RNTesterBlock.js
+++ b/RNTester/js/components/RNTesterBlock.js
@@ -31,7 +31,7 @@ class RNTesterBlock extends React.Component<Props, State> {
   render(): React.Node {
     const description = this.props.description ? (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <Text style={[styles.descriptionText, {color: theme.LabelColor}]}>
               {this.props.description}
@@ -43,7 +43,7 @@ class RNTesterBlock extends React.Component<Props, State> {
 
     return (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <View
               style={[
diff --git a/RNTester/js/components/RNTesterExampleFilter.js b/RNTester/js/components/RNTesterExampleFilter.js
index 992f30e6bc6..f4609f88a47 100644
--- a/RNTester/js/components/RNTesterExampleFilter.js
+++ b/RNTester/js/components/RNTesterExampleFilter.js
@@ -43,10 +43,10 @@ class RNTesterExampleFilter extends React.Component<Props, State> {
       );
     }
 
-    const filter = example =>
+    const filter = (example) =>
       this.props.disableSearch || this.props.filter({example, filterRegex});
 
-    const filteredSections = this.props.sections.map(section => ({
+    const filteredSections = this.props.sections.map((section) => ({
       ...section,
       data: section.data.filter(filter),
     }));
@@ -65,7 +65,7 @@ class RNTesterExampleFilter extends React.Component<Props, State> {
     }
     return (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <View
               style={[
@@ -76,7 +76,7 @@ class RNTesterExampleFilter extends React.Component<Props, State> {
                 autoCapitalize="none"
                 autoCorrect={false}
                 clearButtonMode="always"
-                onChangeText={text => {
+                onChangeText={(text) => {
                   this.setState(() => ({filter: text}));
                 }}
                 placeholder="Search..."
diff --git a/RNTester/js/components/RNTesterExampleList.js b/RNTester/js/components/RNTesterExampleList.js
index bbbfb764a77..7a28d246379 100644
--- a/RNTester/js/components/RNTesterExampleList.js
+++ b/RNTester/js/components/RNTesterExampleList.js
@@ -58,7 +58,7 @@ class RowComponent extends React.PureComponent<{
     const {item} = this.props;
     return (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <TouchableHighlight
               onShowUnderlay={this.props.onShowUnderlay}
@@ -90,7 +90,7 @@ class RowComponent extends React.PureComponent<{
 
 const renderSectionHeader = ({section}) => (
   <RNTesterThemeContext.Consumer>
-    {theme => {
+    {(theme) => {
       return (
         <Text
           style={[
@@ -128,7 +128,7 @@ class RNTesterExampleList extends React.Component<Props, $FlowFixMeState> {
 
     return (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <View
               style={[
@@ -203,7 +203,7 @@ class RNTesterExampleList extends React.Component<Props, $FlowFixMeState> {
 
 const ItemSeparator = ({highlighted}) => (
   <RNTesterThemeContext.Consumer>
-    {theme => {
+    {(theme) => {
       return (
         <View
           style={
diff --git a/RNTester/js/components/RNTesterPage.js b/RNTester/js/components/RNTesterPage.js
index e599db011a8..037ee924229 100644
--- a/RNTester/js/components/RNTesterPage.js
+++ b/RNTester/js/components/RNTesterPage.js
@@ -40,7 +40,7 @@ class RNTesterPage extends React.Component<Props> {
     const spacer = this.props.noSpacer ? null : <View style={styles.spacer} />;
     return (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <View
               style={[
diff --git a/RNTester/js/components/RNTesterSettingSwitchRow.js b/RNTester/js/components/RNTesterSettingSwitchRow.js
index fafcf7a5ffb..6594872100e 100644
--- a/RNTester/js/components/RNTesterSettingSwitchRow.js
+++ b/RNTester/js/components/RNTesterSettingSwitchRow.js
@@ -32,7 +32,7 @@ class RNTesterSettingSwitchRow extends React.Component<
         <Text>{label}</Text>
         <Switch
           value={persister.state}
-          onValueChange={value => {
+          onValueChange={(value) => {
             persister.setState(() => value);
           }}
         />
diff --git a/RNTester/js/components/RNTesterTitle.js b/RNTester/js/components/RNTesterTitle.js
index 44c1abac2f0..0418c562544 100644
--- a/RNTester/js/components/RNTesterTitle.js
+++ b/RNTester/js/components/RNTesterTitle.js
@@ -19,7 +19,7 @@ class RNTesterTitle extends React.Component<$FlowFixMeProps> {
   render(): React.Node {
     return (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <View
               style={[
diff --git a/RNTester/js/components/TextLegend.js b/RNTester/js/components/TextLegend.js
index dd4a1be5261..8e8d1daca85 100644
--- a/RNTester/js/components/TextLegend.js
+++ b/RNTester/js/components/TextLegend.js
@@ -60,20 +60,20 @@ class TextLegend extends React.Component<*, *> {
       <View>
         <Text
           onPress={() =>
-            this.setState(prevState => ({fontSize: prevState.fontSize + 3}))
+            this.setState((prevState) => ({fontSize: prevState.fontSize + 3}))
           }>
           Increase size
         </Text>
         <Text
           onPress={() =>
-            this.setState(prevState => ({fontSize: prevState.fontSize - 3}))
+            this.setState((prevState) => ({fontSize: prevState.fontSize - 3}))
           }>
           Decrease size
         </Text>
         <Picker
           selectedValue={this.state.language}
-          onValueChange={itemValue => this.setState({language: itemValue})}>
-          {Object.keys(PANGRAMS).map(x => (
+          onValueChange={(itemValue) => this.setState({language: itemValue})}>
+          {Object.keys(PANGRAMS).map((x) => (
             <Picker.Item
               label={x[0].toUpperCase() + x.substring(1)}
               key={x}
@@ -224,7 +224,7 @@ class TextLegend extends React.Component<*, *> {
             },
           )}
           <Text
-            onTextLayout={event => {
+            onTextLayout={(event) => {
               this.setState({textMetrics: event.nativeEvent.lines});
             }}
             style={{
@@ -236,7 +236,7 @@ class TextLegend extends React.Component<*, *> {
         </View>
         <Picker
           selectedValue={this.state.alignment}
-          onValueChange={itemValue => this.setState({alignment: itemValue})}>
+          onValueChange={(itemValue) => this.setState({alignment: itemValue})}>
           <Picker.Item label="Left align" value="left" />
           <Picker.Item label="Center align" value="center" />
           <Picker.Item label="Right align" value="right" />
diff --git a/RNTester/js/components/createExamplePage.js b/RNTester/js/components/createExamplePage.js
index b508bc0dd91..4f23eb96583 100644
--- a/RNTester/js/components/createExamplePage.js
+++ b/RNTester/js/components/createExamplePage.js
@@ -15,7 +15,7 @@ const React = require('react');
 const RNTesterExampleContainer = require('./RNTesterExampleContainer');
 import type {RNTesterExample} from '../types/RNTesterTypes';
 
-const createExamplePage = function(
+const createExamplePage = function (
   title: ?string,
   exampleModule: RNTesterExample,
 ): React.ComponentType<any> {
diff --git a/RNTester/js/examples/Accessibility/AccessibilityExample.js b/RNTester/js/examples/Accessibility/AccessibilityExample.js
index 38fa2b3cdb2..fa546fce182 100644
--- a/RNTester/js/examples/Accessibility/AccessibilityExample.js
+++ b/RNTester/js/examples/Accessibility/AccessibilityExample.js
@@ -520,7 +520,7 @@ class AccessibilityActionsExample extends React.Component {
           <View
             accessible={true}
             accessibilityActions={[{name: 'activate'}]}
-            onAccessibilityAction={event => {
+            onAccessibilityAction={(event) => {
               switch (event.nativeEvent.actionName) {
                 case 'activate':
                   Alert.alert('Alert', 'View is clicked');
@@ -539,7 +539,7 @@ class AccessibilityActionsExample extends React.Component {
               {name: 'copy', label: 'copy label'},
               {name: 'paste', label: 'paste label'},
             ]}
-            onAccessibilityAction={event => {
+            onAccessibilityAction={(event) => {
               switch (event.nativeEvent.actionName) {
                 case 'cut':
                   Alert.alert('Alert', 'cut action success');
@@ -561,7 +561,7 @@ class AccessibilityActionsExample extends React.Component {
             accessible={true}
             accessibilityRole="adjustable"
             accessibilityActions={[{name: 'increment'}, {name: 'decrement'}]}
-            onAccessibilityAction={event => {
+            onAccessibilityAction={(event) => {
               switch (event.nativeEvent.actionName) {
                 case 'increment':
                   Alert.alert('Alert', 'increment action success');
@@ -583,7 +583,7 @@ class AccessibilityActionsExample extends React.Component {
               {name: 'copy', label: 'copy label'},
               {name: 'paste', label: 'paste label'},
             ]}
-            onAccessibilityAction={event => {
+            onAccessibilityAction={(event) => {
               switch (event.nativeEvent.actionName) {
                 case 'cut':
                   Alert.alert('Alert', 'cut action success');
@@ -642,7 +642,7 @@ class FakeSliderExample extends React.Component {
           accessibilityLabel="Fake Slider"
           accessibilityRole="adjustable"
           accessibilityActions={[{name: 'increment'}, {name: 'decrement'}]}
-          onAccessibilityAction={event => {
+          onAccessibilityAction={(event) => {
             switch (event.nativeEvent.actionName) {
               case 'increment':
                 this.increment();
@@ -664,7 +664,7 @@ class FakeSliderExample extends React.Component {
           accessibilityLabel="Equalizer"
           accessibilityRole="adjustable"
           accessibilityActions={[{name: 'increment'}, {name: 'decrement'}]}
-          onAccessibilityAction={event => {
+          onAccessibilityAction={(event) => {
             switch (event.nativeEvent.actionName) {
               case 'increment':
                 if (this.state.textualValue === 'center') {
@@ -702,7 +702,7 @@ class ScreenReaderStatusExample extends React.Component<{}> {
       'change',
       this._handleScreenReaderToggled,
     );
-    AccessibilityInfo.fetch().done(isEnabled => {
+    AccessibilityInfo.fetch().done((isEnabled) => {
       this.setState({
         screenReaderEnabled: isEnabled,
       });
@@ -716,7 +716,7 @@ class ScreenReaderStatusExample extends React.Component<{}> {
     );
   }
 
-  _handleScreenReaderToggled = isEnabled => {
+  _handleScreenReaderToggled = (isEnabled) => {
     this.setState({
       screenReaderEnabled: isEnabled,
     });
diff --git a/RNTester/js/examples/Accessibility/AccessibilityIOSExample.js b/RNTester/js/examples/Accessibility/AccessibilityIOSExample.js
index 1ca8e44f54f..591ec35feb7 100644
--- a/RNTester/js/examples/Accessibility/AccessibilityIOSExample.js
+++ b/RNTester/js/examples/Accessibility/AccessibilityIOSExample.js
@@ -21,7 +21,7 @@ class AccessibilityIOSExample extends React.Component<Props> {
     return (
       <RNTesterBlock title="Accessibility iOS APIs">
         <View
-          onAccessibilityAction={event => {
+          onAccessibilityAction={(event) => {
             if (event.nativeEvent.actionName === 'activate') {
               Alert.alert('Alert', 'onAccessibilityTap success');
             }
@@ -31,7 +31,7 @@ class AccessibilityIOSExample extends React.Component<Props> {
           <Text>Accessibility normal tap example</Text>
         </View>
         <View
-          onAccessibilityAction={event => {
+          onAccessibilityAction={(event) => {
             if (event.nativeEvent.actionName === 'magicTap') {
               Alert.alert('Alert', 'onMagicTap success');
             }
@@ -41,7 +41,7 @@ class AccessibilityIOSExample extends React.Component<Props> {
           <Text>Accessibility magic tap example</Text>
         </View>
         <View
-          onAccessibilityAction={event => {
+          onAccessibilityAction={(event) => {
             if (event.nativeEvent.actionName === 'escape') {
               Alert.alert('onAccessibilityEscape success');
             }
diff --git a/RNTester/js/examples/ActionSheetIOS/ActionSheetIOSExample.js b/RNTester/js/examples/ActionSheetIOS/ActionSheetIOSExample.js
index c1130357829..67007c9622c 100644
--- a/RNTester/js/examples/ActionSheetIOS/ActionSheetIOSExample.js
+++ b/RNTester/js/examples/ActionSheetIOS/ActionSheetIOSExample.js
@@ -51,7 +51,7 @@ class ActionSheetExample extends React.Component<Props, State> {
         cancelButtonIndex: CANCEL_INDEX,
         destructiveButtonIndex: DESTRUCTIVE_INDEX,
       },
-      buttonIndex => {
+      (buttonIndex) => {
         this.setState({clicked: BUTTONS[buttonIndex]});
       },
     );
@@ -85,7 +85,7 @@ class ActionSheetTintExample extends React.Component<
         destructiveButtonIndex: DESTRUCTIVE_INDEX,
         tintColor: 'green',
       },
-      buttonIndex => {
+      (buttonIndex) => {
         this.setState({clicked: BUTTONS[buttonIndex]});
       },
     );
@@ -131,7 +131,7 @@ class ActionSheetAnchorExample extends React.Component<
           ? findNodeHandle(this.anchorRef.current)
           : undefined,
       },
-      buttonIndex => {
+      (buttonIndex) => {
         this.setState({clicked: BUTTONS[buttonIndex]});
       },
     );
@@ -165,7 +165,7 @@ class ShareActionSheetExample extends React.Component<
         subject: 'a subject to go in the email heading',
         excludedActivityTypes: ['com.apple.UIKit.activity.PostToTwitter'],
       },
-      error => Alert.alert('Error', error),
+      (error) => Alert.alert('Error', error),
       (completed, method) => {
         let text;
         if (completed) {
@@ -201,14 +201,14 @@ class ShareScreenshotExample extends React.Component<
   showShareActionSheet = () => {
     // Take the snapshot (returns a temp file uri)
     ScreenshotManager.takeScreenshot('window')
-      .then(uri => {
+      .then((uri) => {
         // Share image data
         ActionSheetIOS.showShareActionSheetWithOptions(
           {
             url: uri,
             excludedActivityTypes: ['com.apple.UIKit.activity.PostToTwitter'],
           },
-          error => Alert.alert('Error', error),
+          (error) => Alert.alert('Error', error),
           (completed, method) => {
             let text;
             if (completed) {
@@ -220,7 +220,7 @@ class ShareScreenshotExample extends React.Component<
           },
         );
       })
-      .catch(error => Alert.alert('Error', error));
+      .catch((error) => Alert.alert('Error', error));
   };
 }
 
@@ -256,7 +256,7 @@ class ShareScreenshotAnchorExample extends React.Component<
   showShareActionSheet = () => {
     // Take the snapshot (returns a temp file uri)
     ScreenshotManager.takeScreenshot('window')
-      .then(uri => {
+      .then((uri) => {
         // Share image data
         ActionSheetIOS.showShareActionSheetWithOptions(
           {
@@ -266,7 +266,7 @@ class ShareScreenshotAnchorExample extends React.Component<
               ? findNodeHandle(this.anchorRef.current)
               : undefined,
           },
-          error => Alert.alert('Error', error),
+          (error) => Alert.alert('Error', error),
           (completed, method) => {
             let text;
             if (completed) {
@@ -278,7 +278,7 @@ class ShareScreenshotAnchorExample extends React.Component<
           },
         );
       })
-      .catch(error => Alert.alert('Error', error));
+      .catch((error) => Alert.alert('Error', error));
   };
 }
 
diff --git a/RNTester/js/examples/Animated/AnimatedExample.js b/RNTester/js/examples/Animated/AnimatedExample.js
index 7ef971ca5ee..74c176f9383 100644
--- a/RNTester/js/examples/Animated/AnimatedExample.js
+++ b/RNTester/js/examples/Animated/AnimatedExample.js
@@ -43,7 +43,7 @@ exports.examples = [
     description: ('Uses a simple timing animation to ' +
       'bring opacity from 0 to 1 when the component ' +
       'mounts.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       class FadeInView extends React.Component<$FlowFixMeProps, any> {
         constructor(props) {
           super(props);
@@ -92,7 +92,7 @@ exports.examples = [
             <View>
               <RNTesterButton
                 onPress={() => {
-                  this.setState(state => ({show: !state.show}));
+                  this.setState((state) => ({show: !state.show}));
                 }}>
                 Press to {this.state.show ? 'Hide' : 'Show'}
               </RNTesterButton>
@@ -117,7 +117,7 @@ exports.examples = [
       'ordered set of transforms.  Each transform has ' +
       'an interpolation to convert the value into the ' +
       'right range and units.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       this.anim = this.anim || new Animated.Value(0);
       return (
         <View>
@@ -181,7 +181,7 @@ exports.examples = [
     title: 'Composite Animations with Easing',
     description: ('Sequence, parallel, delay, and ' +
       'stagger with different easing functions.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       this.anims = this.anims || [1, 2, 3].map(() => new Animated.Value(0));
       return (
         <View>
@@ -208,14 +208,14 @@ exports.examples = [
                 Animated.stagger(
                   200,
                   this.anims
-                    .map(anim =>
+                    .map((anim) =>
                       timing(anim, {
                         toValue: 200,
                         useNativeDriver: false,
                       }),
                     )
                     .concat(
-                      this.anims.map(anim =>
+                      this.anims.map((anim) =>
                         timing(anim, {
                           toValue: 0,
                           useNativeDriver: false,
@@ -241,7 +241,7 @@ exports.examples = [
                 Animated.delay(400),
                 Animated.stagger(
                   200,
-                  this.anims.map(anim =>
+                  this.anims.map((anim) =>
                     timing(anim, {
                       toValue: 0,
 
@@ -276,7 +276,7 @@ exports.examples = [
   {
     title: 'Rotating Images',
     description: 'Simple Animated.Image rotation.',
-    render: function(): React.Node {
+    render: function (): React.Node {
       this.anim = this.anim || new Animated.Value(0);
       return (
         <View>
diff --git a/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExApp.js b/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExApp.js
index 849efab08ea..09e05552681 100644
--- a/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExApp.js
+++ b/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExApp.js
@@ -49,7 +49,7 @@ class Circle extends React.Component<any, any> {
 
   _onLongPress(): void {
     const config = {tension: 40, friction: 3};
-    this.state.pan.addListener(value => {
+    this.state.pan.addListener((value) => {
       // Async listener for state changes  (step1: uncomment)
       this.props.onMove && this.props.onMove(value);
     });
@@ -247,9 +247,9 @@ class AnExApp extends React.Component<any, any> {
       } else {
         let onLayout = null;
         if (!this.state.restLayouts[idx]) {
-          onLayout = function(index, e) {
+          onLayout = function (index, e) {
             const layout = e.nativeEvent.layout;
-            this.setState(state => {
+            this.setState((state) => {
               state.restLayouts[index] = layout;
               return state;
             });
@@ -295,7 +295,7 @@ class AnExApp extends React.Component<any, any> {
       <View style={styles.container}>
         <View
           style={styles.grid}
-          onLayout={e => this.setState({layout: e.nativeEvent.layout})}>
+          onLayout={(e) => this.setState({layout: e.nativeEvent.layout})}>
           {circles}
         </View>
       </View>
diff --git a/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExChained.js b/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExChained.js
index 4175fdf3684..531c427ab0d 100644
--- a/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExChained.js
+++ b/RNTester/js/examples/Animated/AnimatedGratuitousApp/AnExChained.js
@@ -56,7 +56,7 @@ class AnExChained extends React.Component<Object, any> {
     this.state.chainResponder = PanResponder.create({
       onStartShouldSetPanResponder: () => true,
       onPanResponderGrant: () => {
-        this.state.stickers[0].stopAnimation(value => {
+        this.state.stickers[0].stopAnimation((value) => {
           this.state.stickers[0].setOffset(value); // start where sticker animated to
           this.state.stickers[0].setValue({x: 0, y: 0}); // avoid flicker before next event
         });
diff --git a/RNTester/js/examples/AppState/AppStateExample.js b/RNTester/js/examples/AppState/AppStateExample.js
index 9e7f17eefc1..2d9bd886108 100644
--- a/RNTester/js/examples/AppState/AppStateExample.js
+++ b/RNTester/js/examples/AppState/AppStateExample.js
@@ -38,7 +38,7 @@ class AppStateSubscription extends React.Component<
     this.setState({memoryWarnings: this.state.memoryWarnings + 1});
   };
 
-  _handleAppStateChange = appState => {
+  _handleAppStateChange = (appState) => {
     const previousAppStates = this.state.previousAppStates.slice();
     previousAppStates.push(this.state.appState);
     this.setState({
diff --git a/RNTester/js/examples/Appearance/AppearanceExample.js b/RNTester/js/examples/Appearance/AppearanceExample.js
index bc2d074b2be..34611f10307 100644
--- a/RNTester/js/examples/Appearance/AppearanceExample.js
+++ b/RNTester/js/examples/Appearance/AppearanceExample.js
@@ -39,7 +39,7 @@ class ColorSchemeSubscription extends React.Component<
   render() {
     return (
       <RNTesterThemeContext.Consumer>
-        {theme => {
+        {(theme) => {
           return (
             <ThemedContainer>
               <ThemedText>{this.state.colorScheme}</ThemedText>
@@ -51,9 +51,9 @@ class ColorSchemeSubscription extends React.Component<
   }
 }
 
-const ThemedContainer = props => (
+const ThemedContainer = (props) => (
   <RNTesterThemeContext.Consumer>
-    {theme => {
+    {(theme) => {
       return (
         <View
           style={{
@@ -68,9 +68,9 @@ const ThemedContainer = props => (
   </RNTesterThemeContext.Consumer>
 );
 
-const ThemedText = props => (
+const ThemedText = (props) => (
   <RNTesterThemeContext.Consumer>
-    {theme => {
+    {(theme) => {
       return <Text style={{color: theme.LabelColor}}>{props.children}</Text>;
     }}
   </RNTesterThemeContext.Consumer>
@@ -107,7 +107,7 @@ exports.examples = [
     render(): React.Element<any> {
       return (
         <RNTesterThemeContext.Consumer>
-          {theme => {
+          {(theme) => {
             return (
               <ThemedContainer>
                 <ThemedText>
@@ -152,9 +152,9 @@ exports.examples = [
     title: 'RNTester App Colors',
     description: 'A light and a dark theme based on standard iOS 13 colors.',
     render(): React.Element<any> {
-      const ColorShowcase = props => (
+      const ColorShowcase = (props) => (
         <RNTesterThemeContext.Consumer>
-          {theme => {
+          {(theme) => {
             return (
               <View
                 style={{
@@ -164,7 +164,7 @@ exports.examples = [
                 <Text style={{fontWeight: '700', color: theme.LabelColor}}>
                   {props.themeName}
                 </Text>
-                {Object.keys(theme).map(key => (
+                {Object.keys(theme).map((key) => (
                   <View style={{flexDirection: 'row'}} key={key}>
                     <View
                       style={{
diff --git a/RNTester/js/examples/AsyncStorage/AsyncStorageExample.js b/RNTester/js/examples/AsyncStorage/AsyncStorageExample.js
index cbbb13acdbd..bd2a2059926 100644
--- a/RNTester/js/examples/AsyncStorage/AsyncStorageExample.js
+++ b/RNTester/js/examples/AsyncStorage/AsyncStorageExample.js
@@ -46,7 +46,7 @@ class BasicStorageExample extends React.Component<{...}, $FlowFixMeState> {
     return (
       <View>
         <PickerIOS selectedValue={color} onValueChange={this._onValueChange}>
-          {COLORS.map(value => (
+          {COLORS.map((value) => (
             <PickerItemIOS key={value} value={value} label={value} />
           ))}
         </PickerIOS>
@@ -60,14 +60,14 @@ class BasicStorageExample extends React.Component<{...}, $FlowFixMeState> {
         </Text>
         <Text />
         <Text>Messages:</Text>
-        {this.state.messages.map(m => (
+        {this.state.messages.map((m) => (
           <Text key={m}>{m}</Text>
         ))}
       </View>
     );
   }
 
-  _onValueChange = async selectedValue => {
+  _onValueChange = async (selectedValue) => {
     this.setState({selectedValue});
     try {
       await AsyncStorage.setItem(STORAGE_KEY, selectedValue);
@@ -86,7 +86,7 @@ class BasicStorageExample extends React.Component<{...}, $FlowFixMeState> {
     }
   };
 
-  _appendMessage = message => {
+  _appendMessage = (message) => {
     this.setState({messages: this.state.messages.concat(message)});
   };
 }
diff --git a/RNTester/js/examples/Button/ButtonExample.js b/RNTester/js/examples/Button/ButtonExample.js
index 981cdee0c56..75a3719448b 100644
--- a/RNTester/js/examples/Button/ButtonExample.js
+++ b/RNTester/js/examples/Button/ButtonExample.js
@@ -30,10 +30,10 @@ exports.examples = [
     description: ('The title and onPress handler are required. It is ' +
       'recommended to set accessibilityLabel to help make your app usable by ' +
       'everyone.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <RNTesterThemeContext.Consumer>
-          {theme => {
+          {(theme) => {
             return (
               <Button
                 onPress={() => onButtonPress('Simple')}
@@ -53,10 +53,10 @@ exports.examples = [
     description: ('Adjusts the color in a way that looks standard on each ' +
       'platform. On iOS, the color prop controls the color of the text. On ' +
       'Android, the color adjusts the background color of the button.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <RNTesterThemeContext.Consumer>
-          {theme => {
+          {(theme) => {
             return (
               <Button
                 onPress={() => onButtonPress('Purple')}
@@ -75,10 +75,10 @@ exports.examples = [
     title: 'Fit to text layout',
     description: ('This layout strategy lets the title define the width of ' +
       'the button': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <RNTesterThemeContext.Consumer>
-          {theme => {
+          {(theme) => {
             return (
               <View style={styles.container}>
                 <Button
@@ -105,7 +105,7 @@ exports.examples = [
   {
     title: 'Disabled Button',
     description: 'All interactions for the component are disabled.',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Button
           disabled
diff --git a/RNTester/js/examples/CheckBox/CheckBoxExample.js b/RNTester/js/examples/CheckBox/CheckBoxExample.js
index c9e795f638d..ee55d72833c 100644
--- a/RNTester/js/examples/CheckBox/CheckBoxExample.js
+++ b/RNTester/js/examples/CheckBox/CheckBoxExample.js
@@ -29,13 +29,13 @@ class BasicCheckBoxExample extends React.Component<BasicProps, BasicState> {
     return (
       <View>
         <CheckBox
-          onValueChange={value => this.setState({falseCheckBoxIsOn: value})}
+          onValueChange={(value) => this.setState({falseCheckBoxIsOn: value})}
           style={styles.checkbox}
           value={this.state.falseCheckBoxIsOn}
           tintColors={{false: 'red'}}
         />
         <CheckBox
-          onValueChange={value => this.setState({trueCheckBoxIsOn: value})}
+          onValueChange={(value) => this.setState({trueCheckBoxIsOn: value})}
           value={this.state.trueCheckBoxIsOn}
           tintColors={{true: 'green'}}
         />
@@ -73,12 +73,12 @@ class EventCheckBoxExample extends React.Component<EventProps, EventState> {
       <View style={styles.container}>
         <View>
           <CheckBox
-            onValueChange={value => this.setState({eventCheckBoxIsOn: value})}
+            onValueChange={(value) => this.setState({eventCheckBoxIsOn: value})}
             style={styles.checkbox}
             value={this.state.eventCheckBoxIsOn}
           />
           <CheckBox
-            onValueChange={value => this.setState({eventCheckBoxIsOn: value})}
+            onValueChange={(value) => this.setState({eventCheckBoxIsOn: value})}
             style={styles.checkbox}
             value={this.state.eventCheckBoxIsOn}
           />
@@ -86,14 +86,14 @@ class EventCheckBoxExample extends React.Component<EventProps, EventState> {
         </View>
         <View>
           <CheckBox
-            onValueChange={value =>
+            onValueChange={(value) =>
               this.setState({eventCheckBoxRegressionIsOn: value})
             }
             style={styles.checkbox}
             value={this.state.eventCheckBoxRegressionIsOn}
           />
           <CheckBox
-            onValueChange={value =>
+            onValueChange={(value) =>
               this.setState({eventCheckBoxRegressionIsOn: value})
             }
             style={styles.checkbox}
diff --git a/RNTester/js/examples/DatePicker/DatePickerAndroidExample.js b/RNTester/js/examples/DatePicker/DatePickerAndroidExample.js
index e52037f5aeb..82a3770a4ea 100644
--- a/RNTester/js/examples/DatePicker/DatePickerAndroidExample.js
+++ b/RNTester/js/examples/DatePicker/DatePickerAndroidExample.js
@@ -163,7 +163,7 @@ exports.description = 'Standard Android date picker dialog';
 exports.examples = [
   {
     title: 'Simple date picker',
-    render: function(): React.Element<typeof DatePickerAndroidExample> {
+    render: function (): React.Element<typeof DatePickerAndroidExample> {
       return <DatePickerAndroidExample />;
     },
   },
diff --git a/RNTester/js/examples/DatePicker/DatePickerIOSExample.js b/RNTester/js/examples/DatePicker/DatePickerIOSExample.js
index 6aef85f215f..acde622c6ad 100644
--- a/RNTester/js/examples/DatePicker/DatePickerIOSExample.js
+++ b/RNTester/js/examples/DatePicker/DatePickerIOSExample.js
@@ -26,7 +26,7 @@ class WithDatePickerData extends React.Component<Props, State> {
     date: new Date(),
   };
 
-  onDateChange = date => {
+  onDateChange = (date) => {
     this.setState({date: date});
   };
 
@@ -97,7 +97,7 @@ exports.description = 'Select dates and times using the native UIDatePicker.';
 exports.examples = [
   {
     title: 'Date and time picker',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return (
         <WithDatePickerData>
           {(state, onDateChange) => (
@@ -114,7 +114,7 @@ exports.examples = [
   },
   {
     title: 'Date only picker',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return (
         <WithDatePickerData>
           {(state, onDateChange) => (
@@ -131,7 +131,7 @@ exports.examples = [
   },
   {
     title: 'Time only picker, 20-minute interval',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return (
         <WithDatePickerData>
           {(state, onDateChange) => (
diff --git a/RNTester/js/examples/Dimensions/DimensionsExample.js b/RNTester/js/examples/Dimensions/DimensionsExample.js
index b5d0e4fe630..06bc9e6e966 100644
--- a/RNTester/js/examples/Dimensions/DimensionsExample.js
+++ b/RNTester/js/examples/Dimensions/DimensionsExample.js
@@ -29,7 +29,7 @@ class DimensionsSubscription extends React.Component<
     Dimensions.removeEventListener('change', this._handleDimensionsChange);
   }
 
-  _handleDimensionsChange = dimensions => {
+  _handleDimensionsChange = (dimensions) => {
     this.setState({
       dims: dimensions[this.props.dim],
     });
diff --git a/RNTester/js/examples/FlatList/FlatListExample.js b/RNTester/js/examples/FlatList/FlatListExample.js
index c452ace6040..b8f8d55621d 100644
--- a/RNTester/js/examples/FlatList/FlatListExample.js
+++ b/RNTester/js/examples/FlatList/FlatListExample.js
@@ -76,11 +76,11 @@ class FlatListExample extends React.PureComponent<Props, State> {
     fadingEdgeLength: 0,
   };
 
-  _onChangeFilterText = filterText => {
+  _onChangeFilterText = (filterText) => {
     this.setState({filterText});
   };
 
-  _onChangeScrollToIndex = text => {
+  _onChangeScrollToIndex = (text) => {
     this._listRef
       .getNode()
       .scrollToIndex({viewPosition: 0.5, index: Number(text)});
@@ -102,7 +102,7 @@ class FlatListExample extends React.PureComponent<Props, State> {
 
   render(): React.Node {
     const filterRegex = new RegExp(String(this.state.filterText), 'i');
-    const filter = item =>
+    const filter = (item) =>
       filterRegex.test(item.text) || filterRegex.test(item.title);
     const filteredData = this.state.data.filter(filter);
     const flatListItemRendererProps = this._renderItemComponent();
@@ -139,7 +139,7 @@ class FlatListExample extends React.PureComponent<Props, State> {
                     placeholder="Fading edge length"
                     underlineColorAndroid="black"
                     keyboardType={'numeric'}
-                    onChange={event =>
+                    onChange={(event) =>
                       this.setState({
                         fadingEdgeLength: Number(event.nativeEvent.text),
                       })
@@ -188,7 +188,7 @@ class FlatListExample extends React.PureComponent<Props, State> {
       </RNTesterPage>
     );
   }
-  _captureRef = ref => {
+  _captureRef = (ref) => {
     this._listRef = ref;
   };
   _getItemLayout = (data: any, index: number) => {
@@ -198,7 +198,7 @@ class FlatListExample extends React.PureComponent<Props, State> {
     if (this.state.data.length >= 1000) {
       return;
     }
-    this.setState(state => ({
+    this.setState((state) => ({
       data: state.data.concat(genItemData(100, state.data.length)),
     }));
   };
@@ -244,7 +244,7 @@ class FlatListExample extends React.PureComponent<Props, State> {
     if (this.state.logViewable) {
       infoLog(
         'onViewableItemsChanged: ',
-        info.changed.map(v => ({...v, item: '...'})),
+        info.changed.map((v) => ({...v, item: '...'})),
       );
     }
   };
@@ -280,7 +280,7 @@ exports.simpleExampleContainer = true;
 exports.examples = [
   {
     title: 'Simple list of items',
-    render: function(): React.Element<typeof FlatListExample> {
+    render: function (): React.Element<typeof FlatListExample> {
       return <FlatListExample />;
     },
   },
diff --git a/RNTester/js/examples/Image/ImageExample.js b/RNTester/js/examples/Image/ImageExample.js
index da56f1865f6..81c79f8115f 100644
--- a/RNTester/js/examples/Image/ImageExample.js
+++ b/RNTester/js/examples/Image/ImageExample.js
@@ -59,7 +59,7 @@ class NetworkImageCallbackExample extends React.Component<
   }
 
   _loadEventFired = (event: string) => {
-    this.setState(state => ({
+    this.setState((state) => ({
       events: [...state.events, event],
     }));
   };
@@ -74,7 +74,7 @@ class NetworkImageCallbackExample extends React.Component<
           onLoadStart={() =>
             this._loadEventFired(`✔ onLoadStart (+${new Date() - mountTime}ms)`)
           }
-          onLoad={event => {
+          onLoad={(event) => {
             if (event.nativeEvent.source) {
               const url = event.nativeEvent.source.url;
               this._loadEventFired(
@@ -92,12 +92,13 @@ class NetworkImageCallbackExample extends React.Component<
                   this._loadEventFired(
                     `✔ Prefetch OK (+${new Date() - mountTime}ms)`,
                   );
-                  Image.queryCache([IMAGE_PREFETCH_URL]).then(map => {
+                  Image.queryCache([IMAGE_PREFETCH_URL]).then((map) => {
                     const result = map[IMAGE_PREFETCH_URL];
                     if (result) {
                       this._loadEventFired(
-                        `✔ queryCache "${result}" (+${new Date() -
-                          mountTime}ms)`,
+                        `✔ queryCache "${result}" (+${
+                          new Date() - mountTime
+                        }ms)`,
                       );
                     } else {
                       this._loadEventFired(
@@ -106,7 +107,7 @@ class NetworkImageCallbackExample extends React.Component<
                     }
                   });
                 },
-                error => {
+                (error) => {
                   this._loadEventFired(
                     `✘ Prefetch failed (+${new Date() - mountTime}ms)`,
                   );
@@ -124,13 +125,14 @@ class NetworkImageCallbackExample extends React.Component<
                 `✔ (prefetched) onLoadStart (+${new Date() - mountTime}ms)`,
               )
             }
-            onLoad={event => {
+            onLoad={(event) => {
               // Currently this image source feature is only available on iOS.
               if (event.nativeEvent.source) {
                 const url = event.nativeEvent.source.url;
                 this._loadEventFired(
-                  `✔ (prefetched) onLoad (+${new Date() -
-                    mountTime}ms) for URL ${url}`,
+                  `✔ (prefetched) onLoad (+${
+                    new Date() - mountTime
+                  }ms) for URL ${url}`,
                 );
               } else {
                 this._loadEventFired(
@@ -184,11 +186,11 @@ class NetworkImageExample extends React.Component<
       <ImageBackground
         source={this.props.source}
         style={[styles.base, {overflow: 'visible'}]}
-        onLoadStart={e => this.setState({loading: true})}
-        onError={e =>
+        onLoadStart={(e) => this.setState({loading: true})}
+        onError={(e) =>
           this.setState({error: e.nativeEvent.error, loading: false})
         }
-        onProgress={e =>
+        onProgress={(e) =>
           this.setState({
             progress: Math.round(
               (100 * e.nativeEvent.loaded) / e.nativeEvent.total,
@@ -410,7 +412,7 @@ exports.examples = [
     title: 'Plain Network Image',
     description: ('If the `source` prop `uri` property is prefixed with ' +
       '"http", then it will be downloaded from the network.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <Image source={fullImage} style={styles.base} />;
     },
   },
@@ -418,7 +420,7 @@ exports.examples = [
     title: 'Plain Static Image',
     description: ('Static assets should be placed in the source code tree, and ' +
       'required in the same way as JavaScript modules.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image
@@ -443,7 +445,7 @@ exports.examples = [
   },
   {
     title: 'Image Loading Events',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <NetworkImageCallbackExample
           source={{
@@ -456,7 +458,7 @@ exports.examples = [
   },
   {
     title: 'Error Handler',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <NetworkImageExample
           source={{
@@ -469,7 +471,7 @@ exports.examples = [
   },
   {
     title: 'Image Download Progress',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <NetworkImageExample
           source={{
@@ -483,7 +485,7 @@ exports.examples = [
   {
     title: 'defaultSource',
     description: 'Show a placeholder image when a network image is loading',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Image
           defaultSource={require('../../assets/bunny.png')}
@@ -501,7 +503,7 @@ exports.examples = [
     description: ('First image has never been loaded before and is instructed not to load unless in cache.' +
       'Placeholder image from above will stay. Second image is the same but forced to load regardless of' +
       ' local cache state.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image
@@ -527,7 +529,7 @@ exports.examples = [
   },
   {
     title: 'Border Color',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image
@@ -544,7 +546,7 @@ exports.examples = [
   },
   {
     title: 'Border Width',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image
@@ -561,7 +563,7 @@ exports.examples = [
   },
   {
     title: 'Border Radius',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image style={[styles.base, {borderRadius: 5}]} source={fullImage} />
@@ -607,7 +609,7 @@ exports.examples = [
   },
   {
     title: 'Background Color',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image source={smallImage} style={styles.base} />
@@ -633,7 +635,7 @@ exports.examples = [
   },
   {
     title: 'Opacity',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image style={[styles.base, {opacity: 1}]} source={fullImage} />
@@ -663,7 +665,7 @@ exports.examples = [
   },
   {
     title: 'Nesting content inside <Image> component',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={{width: 60, height: 60}}>
           <Image
@@ -677,7 +679,7 @@ exports.examples = [
   },
   {
     title: 'Nesting content inside <ImageBackground> component',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <ImageBackground
           style={{width: 60, height: 60, backgroundColor: 'transparent'}}
@@ -691,7 +693,7 @@ exports.examples = [
     title: 'Tint Color',
     description: ('The `tintColor` style prop changes all the non-alpha ' +
       'pixels to the tint color.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <View style={styles.horizontal}>
@@ -765,7 +767,7 @@ exports.examples = [
     title: 'Resize Mode',
     description: ('The `resizeMode` style prop controls how the image is ' +
       'rendered within the frame.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           {[smallImage, fullImage].map((image, index) => {
@@ -833,7 +835,7 @@ exports.examples = [
   },
   {
     title: 'Animated GIF',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Image
           style={styles.gif}
@@ -845,7 +847,7 @@ exports.examples = [
   },
   {
     title: 'Base64 image',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Image style={styles.base64} source={{uri: base64Icon, scale: 3}} />
       );
@@ -858,14 +860,14 @@ exports.examples = [
       'by capInsets will stay a fixed size, but the center content and ' +
       'borders of the image will be stretched. This is useful for creating ' +
       'resizable rounded buttons, shadows, and other resizable assets.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <ImageCapInsetsExample />;
     },
     platform: 'ios',
   },
   {
     title: 'Image Size',
-    render: function(): React.Node {
+    render: function (): React.Node {
       /* $FlowFixMe(>=0.115.0 site=react_native_fb) This comment suppresses an
        * error found when Flow v0.115 was deployed. To see the error, delete
        * this comment and run Flow. */
@@ -876,7 +878,7 @@ exports.examples = [
     title: 'MultipleSourcesExample',
     description: ('The `source` prop allows passing in an array of uris, so that native to choose which image ' +
       'to diplay based on the size of the of the target image': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <MultipleSourcesExample />;
     },
   },
@@ -884,14 +886,14 @@ exports.examples = [
     title: 'Legacy local image',
     description: ('Images shipped with the native bundle, but not managed ' +
       'by the JS packager': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <Image source={{uri: 'legacy_image', width: 120, height: 120}} />;
     },
   },
   {
     title: 'Bundled images',
     description: 'Images shipped in a separate native bundle',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={{flexDirection: 'row'}}>
           <Image
@@ -919,7 +921,7 @@ exports.examples = [
   },
   {
     title: 'Blur Radius',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View style={styles.horizontal}>
           <Image style={[styles.base]} source={fullImage} blurRadius={0} />
diff --git a/RNTester/js/examples/InputAccessoryView/InputAccessoryViewExample.js b/RNTester/js/examples/InputAccessoryView/InputAccessoryViewExample.js
index 80bddeb9173..c32ef81fd84 100644
--- a/RNTester/js/examples/InputAccessoryView/InputAccessoryViewExample.js
+++ b/RNTester/js/examples/InputAccessoryView/InputAccessoryViewExample.js
@@ -43,7 +43,7 @@ class TextInputBar extends React.PureComponent<TextInputProps, TextInputState> {
       <View style={styles.textInputContainer}>
         <TextInput
           style={styles.textInput}
-          onChangeText={text => {
+          onChangeText={(text) => {
             this.setState({text});
           }}
           value={this.state.text}
@@ -114,7 +114,7 @@ exports.description =
 exports.examples = [
   {
     title: 'Simple view with sticky input',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <InputAccessoryViewExample />;
     },
   },
diff --git a/RNTester/js/examples/JSResponderHandlerExample/JSResponderHandlerExample.js b/RNTester/js/examples/JSResponderHandlerExample/JSResponderHandlerExample.js
index de7a78aaf78..0d69bcc2a59 100644
--- a/RNTester/js/examples/JSResponderHandlerExample/JSResponderHandlerExample.js
+++ b/RNTester/js/examples/JSResponderHandlerExample/JSResponderHandlerExample.js
@@ -35,7 +35,7 @@ exports.examples = [
       ' right side of the gray area), the touch event is managed by native ' +
       'which blocks the scroll event.': string),
 
-    render: function(): React.Node {
+    render: function (): React.Node {
       const views = [];
       for (let i = 0; i < 100; i++) {
         views[i] = (
diff --git a/RNTester/js/examples/KeyboardAvoidingView/KeyboardAvoidingViewExample.js b/RNTester/js/examples/KeyboardAvoidingView/KeyboardAvoidingViewExample.js
index da9ab113835..7ed180f620d 100644
--- a/RNTester/js/examples/KeyboardAvoidingView/KeyboardAvoidingViewExample.js
+++ b/RNTester/js/examples/KeyboardAvoidingView/KeyboardAvoidingViewExample.js
@@ -113,7 +113,7 @@ exports.description =
 exports.examples = [
   {
     title: 'Simple keyboard view',
-    render: function(): React.Element<typeof KeyboardAvoidingViewExample> {
+    render: function (): React.Element<typeof KeyboardAvoidingViewExample> {
       return <KeyboardAvoidingViewExample />;
     },
   },
diff --git a/RNTester/js/examples/Layout/LayoutAnimationExample.js b/RNTester/js/examples/Layout/LayoutAnimationExample.js
index 4a0eac9fc58..0949c32b6ba 100644
--- a/RNTester/js/examples/Layout/LayoutAnimationExample.js
+++ b/RNTester/js/examples/Layout/LayoutAnimationExample.js
@@ -25,17 +25,17 @@ class AddRemoveExample extends React.Component<{...}, $FlowFixMeState> {
   };
 
   UNSAFE_componentWillUpdate() {
-    LayoutAnimation.easeInEaseOut(args =>
+    LayoutAnimation.easeInEaseOut((args) =>
       console.log('AddRemoveExample completed', args),
     );
   }
 
   _onPressAddView = () => {
-    this.setState(state => ({views: [...state.views, {}]}));
+    this.setState((state) => ({views: [...state.views, {}]}));
   };
 
   _onPressRemoveView = () => {
-    this.setState(state => ({views: state.views.slice(0, -1)}));
+    this.setState((state) => ({views: state.views.slice(0, -1)}));
   };
 
   render() {
@@ -80,10 +80,10 @@ class CrossFadeExample extends React.Component<{...}, $FlowFixMeState> {
   };
 
   _onPressToggle = () => {
-    LayoutAnimation.easeInEaseOut(args =>
+    LayoutAnimation.easeInEaseOut((args) =>
       console.log('CrossFadeExample completed', args),
     );
-    this.setState(state => ({toggled: !state.toggled}));
+    this.setState((state) => ({toggled: !state.toggled}));
   };
 
   render() {
@@ -132,7 +132,7 @@ class LayoutUpdateExample extends React.Component<{...}, $FlowFixMeState> {
           type: LayoutAnimation.Types.linear,
         },
       },
-      args => console.log('LayoutUpdateExample completed', args),
+      (args) => console.log('LayoutUpdateExample completed', args),
     );
 
     this.timeout = setTimeout(() => this.setState({width: 100}), 500);
diff --git a/RNTester/js/examples/Layout/LayoutEventsExample.js b/RNTester/js/examples/Layout/LayoutEventsExample.js
index 5abb07d95e7..3b53899a8a2 100644
--- a/RNTester/js/examples/Layout/LayoutEventsExample.js
+++ b/RNTester/js/examples/Layout/LayoutEventsExample.js
@@ -158,7 +158,7 @@ exports.description = ('Examples that show how Layout events can be used to ' +
 exports.examples = [
   {
     title: 'LayoutEventExample',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <LayoutEventExample />;
     },
   },
diff --git a/RNTester/js/examples/Layout/LayoutExample.js b/RNTester/js/examples/Layout/LayoutExample.js
index 9c69038f30f..1d5074e7f78 100644
--- a/RNTester/js/examples/Layout/LayoutExample.js
+++ b/RNTester/js/examples/Layout/LayoutExample.js
@@ -199,7 +199,7 @@ exports.displayName = 'LayoutExample';
 exports.examples = [
   {
     title: 'Simple layout using flexbox',
-    render: function(): React.Element<typeof LayoutExample> {
+    render: function (): React.Element<typeof LayoutExample> {
       return <LayoutExample />;
     },
   },
diff --git a/RNTester/js/examples/Linking/LinkingExample.js b/RNTester/js/examples/Linking/LinkingExample.js
index df63aadce14..911ff48e2b6 100644
--- a/RNTester/js/examples/Linking/LinkingExample.js
+++ b/RNTester/js/examples/Linking/LinkingExample.js
@@ -28,7 +28,7 @@ type Props = $ReadOnly<{|
 
 class OpenURLButton extends React.Component<Props> {
   handleClick = () => {
-    Linking.canOpenURL(this.props.url).then(supported => {
+    Linking.canOpenURL(this.props.url).then((supported) => {
       if (supported) {
         Linking.openURL(this.props.url);
       } else {
@@ -121,7 +121,7 @@ exports.description = 'Shows how to use Linking to open URLs.';
 exports.examples = [
   {
     title: 'Simple list of items',
-    render: function(): React.Element<typeof IntentAndroidExample> {
+    render: function (): React.Element<typeof IntentAndroidExample> {
       return <IntentAndroidExample />;
     },
   },
diff --git a/RNTester/js/examples/MaskedView/MaskedViewExample.js b/RNTester/js/examples/MaskedView/MaskedViewExample.js
index 7ad01c6e41c..fa77eff27d7 100644
--- a/RNTester/js/examples/MaskedView/MaskedViewExample.js
+++ b/RNTester/js/examples/MaskedView/MaskedViewExample.js
@@ -103,7 +103,7 @@ class ChangingChildrenMaskExample extends React.Component<
 
   componentDidMount() {
     setInterval(() => {
-      this.setState(state => ({
+      this.setState((state) => ({
         alternateChildren: !state.alternateChildren,
       }));
     }, 1000);
@@ -174,7 +174,7 @@ exports.description =
 exports.examples = [
   {
     title: 'Basic Mask',
-    render: function(): React.Element<typeof View> {
+    render: function (): React.Element<typeof View> {
       return (
         <View style={styles.exampleWrapperStyle}>
           <MaskedViewIOS
@@ -193,7 +193,7 @@ exports.examples = [
   },
   {
     title: 'Image Mask',
-    render: function(): React.Element<typeof View> {
+    render: function (): React.Element<typeof View> {
       return (
         <View style={[styles.exampleWrapperStyle, styles.grayStyle]}>
           <MaskedViewIOS
@@ -223,13 +223,13 @@ exports.examples = [
   },
   {
     title: 'Animated Mask',
-    render: function(): React.Element<typeof AnimatedMaskExample> {
+    render: function (): React.Element<typeof AnimatedMaskExample> {
       return <AnimatedMaskExample />;
     },
   },
   {
     title: 'Mask w/ Changing Children',
-    render: function(): React.Element<typeof ChangingChildrenMaskExample> {
+    render: function (): React.Element<typeof ChangingChildrenMaskExample> {
       return <ChangingChildrenMaskExample />;
     },
   },
diff --git a/RNTester/js/examples/Modal/ModalExample.js b/RNTester/js/examples/Modal/ModalExample.js
index d8418f496fe..ea98dcba9c3 100644
--- a/RNTester/js/examples/Modal/ModalExample.js
+++ b/RNTester/js/examples/Modal/ModalExample.js
@@ -81,11 +81,11 @@ class ModalExample extends React.Component<{...}, $FlowFixMeState> {
     currentOrientation: 'unknown',
   };
 
-  _setModalVisible = visible => {
+  _setModalVisible = (visible) => {
     this.setState({modalVisible: visible});
   };
 
-  _setAnimationType = type => {
+  _setAnimationType = (type) => {
     this.setState({animationType: type});
   };
 
@@ -131,7 +131,7 @@ class ModalExample extends React.Component<{...}, $FlowFixMeState> {
               this.state.selectedSupportedOrientation
             ]
           }
-          onOrientationChange={evt =>
+          onOrientationChange={(evt) =>
             this.setState({currentOrientation: evt.nativeEvent.orientation})
           }>
           <View style={[styles.container, modalBackgroundStyle]}>
@@ -200,7 +200,7 @@ class ModalExample extends React.Component<{...}, $FlowFixMeState> {
           <Text style={styles.rowTitle}>Presentation style</Text>
           <Picker
             selectedValue={this.state.presentationStyle}
-            onValueChange={presentationStyle =>
+            onValueChange={(presentationStyle) =>
               this.setState({presentationStyle})
             }
             itemStyle={styles.pickerItem}>
diff --git a/RNTester/js/examples/MultiColumn/MultiColumnExample.js b/RNTester/js/examples/MultiColumn/MultiColumnExample.js
index 601ddf67b12..444aefc6af7 100644
--- a/RNTester/js/examples/MultiColumn/MultiColumnExample.js
+++ b/RNTester/js/examples/MultiColumn/MultiColumnExample.js
@@ -50,15 +50,15 @@ class MultiColumnExample extends React.PureComponent<
     numColumns: 2,
     virtualized: true,
   };
-  _onChangeFilterText = filterText => {
+  _onChangeFilterText = (filterText) => {
     this.setState(() => ({filterText}));
   };
-  _onChangeNumColumns = numColumns => {
+  _onChangeNumColumns = (numColumns) => {
     this.setState(() => ({numColumns: Number(numColumns)}));
   };
   render(): React.Node {
     const filterRegex = new RegExp(String(this.state.filterText), 'i');
-    const filter = item =>
+    const filter = (item) =>
       filterRegex.test(item.text) || filterRegex.test(item.title);
     const filteredData = this.state.data.filter(filter);
     return (
@@ -147,7 +147,7 @@ class MultiColumnExample extends React.PureComponent<
     if (this.state.logViewable) {
       infoLog(
         'onViewableItemsChanged: ',
-        info.changed.map(v => ({...v, item: '...'})),
+        info.changed.map((v) => ({...v, item: '...'})),
       );
     }
   };
@@ -182,7 +182,7 @@ exports.description = 'Performant, scrollable grid of data.';
 exports.examples = [
   {
     title: 'Simple flat list multi column',
-    render: function(): React.Element<typeof MultiColumnExample> {
+    render: function (): React.Element<typeof MultiColumnExample> {
       return <MultiColumnExample />;
     },
   },
diff --git a/RNTester/js/examples/NativeAnimation/NativeAnimationsExample.js b/RNTester/js/examples/NativeAnimation/NativeAnimationsExample.js
index e6c4fcb591c..5bf02a707e0 100644
--- a/RNTester/js/examples/NativeAnimation/NativeAnimationsExample.js
+++ b/RNTester/js/examples/NativeAnimation/NativeAnimationsExample.js
@@ -80,7 +80,7 @@ class ValueListenerExample extends React.Component<{...}, $FlowFixMeState> {
   _current = 0;
 
   componentDidMount() {
-    this.state.anim.addListener(e => this.setState({progress: e.value}));
+    this.state.anim.addListener((e) => this.setState({progress: e.value}));
   }
 
   componentWillUnmount() {
@@ -204,7 +204,7 @@ class InternalSettings extends React.Component<
             require('../../../../Libraries/Interaction/JSEventLoopWatchdog').addHandler(
               {
                 onStall: ({busyTime}) =>
-                  this.setState(state => ({
+                  this.setState((state) => ({
                     busyTime,
                     filteredStall:
                       (state.filteredStall || 0) * 0.97 + busyTime * 0.03,
@@ -379,10 +379,10 @@ exports.description = 'Test out Native Animations';
 exports.examples = [
   {
     title: 'Multistage With Multiply and rotation',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="timing" config={{duration: 1000}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -427,10 +427,10 @@ exports.examples = [
   },
   {
     title: 'Multistage With Multiply',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="timing" config={{duration: 1000}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -469,10 +469,10 @@ exports.examples = [
   },
   {
     title: 'Multistage With Subtract',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="timing" config={{duration: 1000}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -511,10 +511,10 @@ exports.examples = [
   },
   {
     title: 'Scale interpolation with clamping',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="timing" config={{duration: 1000}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -538,10 +538,10 @@ exports.examples = [
   },
   {
     title: 'Opacity with delay',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="timing" config={{duration: 1000, delay: 1000}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -557,10 +557,10 @@ exports.examples = [
   },
   {
     title: 'Rotate interpolation',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="timing" config={{duration: 1000}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -583,10 +583,10 @@ exports.examples = [
   },
   {
     title: 'translateX => Animated.spring (bounciness/speed)',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="spring" config={{bounciness: 0}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -609,10 +609,10 @@ exports.examples = [
   },
   {
     title: 'translateX => Animated.spring (stiffness/damping/mass)',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="spring" config={{stiffness: 1000, damping: 500, mass: 3}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -635,13 +635,13 @@ exports.examples = [
   },
   {
     title: 'translateX => Animated.decay',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester
           type="decay"
           config={{velocity: 0.5}}
           reverseConfig={{velocity: -0.5}}>
-          {anim => (
+          {(anim) => (
             <Animated.View
               style={[
                 styles.block,
@@ -661,41 +661,41 @@ exports.examples = [
   },
   {
     title: 'Drive custom property (tap to animate)',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Tester type="timing" config={{duration: 1000}}>
-          {anim => <AnimatedSlider style={{}} value={anim} />}
+          {(anim) => <AnimatedSlider style={{}} value={anim} />}
         </Tester>
       );
     },
   },
   {
     title: 'Animated value listener',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <ValueListenerExample />;
     },
   },
   {
     title: 'Animated loop',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <LoopExample />;
     },
   },
   {
     title: 'Animated events',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <EventExample />;
     },
   },
   {
     title: 'Animated Tracking - tap me many times',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TrackingExample />;
     },
   },
   {
     title: 'Internal Settings',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <InternalSettings />;
     },
   },
diff --git a/RNTester/js/examples/NewAppScreen/NewAppScreenExample.js b/RNTester/js/examples/NewAppScreen/NewAppScreenExample.js
index c7f9b3dffab..34070df8d24 100644
--- a/RNTester/js/examples/NewAppScreen/NewAppScreenExample.js
+++ b/RNTester/js/examples/NewAppScreen/NewAppScreenExample.js
@@ -48,7 +48,7 @@ exports.examples = [
     render(): React.Element<any> {
       return (
         <View style={{flexDirection: 'row'}}>
-          {Object.keys(Colors).map(key => (
+          {Object.keys(Colors).map((key) => (
             <View
               key={`color-${key}`}
               style={{width: 50, height: 50, backgroundColor: Colors[key]}}
diff --git a/RNTester/js/examples/PanResponder/PanResponderExample.js b/RNTester/js/examples/PanResponder/PanResponderExample.js
index db85851eb38..183d5f2c978 100644
--- a/RNTester/js/examples/PanResponder/PanResponderExample.js
+++ b/RNTester/js/examples/PanResponder/PanResponderExample.js
@@ -105,7 +105,7 @@ class PanResponderExample extends React.Component<Props, State> {
         title="Basic gesture handling">
         <View style={styles.container}>
           <View
-            ref={circle => {
+            ref={(circle) => {
               this.circle = circle;
             }}
             style={[
@@ -147,7 +147,7 @@ exports.simpleExampleContainer = true;
 exports.examples = [
   {
     title: 'Basic gesture handling',
-    render: function(): React.Element<typeof PanResponderExample> {
+    render: function (): React.Element<typeof PanResponderExample> {
       return <PanResponderExample />;
     },
   },
diff --git a/RNTester/js/examples/Picker/PickerExample.js b/RNTester/js/examples/Picker/PickerExample.js
index c4d1e2bfcf4..ae1a8e9470d 100644
--- a/RNTester/js/examples/Picker/PickerExample.js
+++ b/RNTester/js/examples/Picker/PickerExample.js
@@ -29,7 +29,7 @@ class BasicPickerExample extends React.Component<{...}, State> {
         testID="basic-picker"
         style={styles.picker}
         selectedValue={this.state.value}
-        onValueChange={v => this.setState({value: v})}>
+        onValueChange={(v) => this.setState({value: v})}>
         <Item label="hello" value="key0" />
         <Item label="world" value="key1" />
       </Picker>
@@ -65,7 +65,7 @@ class DropdownPickerExample extends React.Component<{...}, State> {
       <Picker
         style={styles.picker}
         selectedValue={this.state.value}
-        onValueChange={v => this.setState({value: v})}
+        onValueChange={(v) => this.setState({value: v})}
         mode="dropdown">
         <Item label="hello" value="key0" />
         <Item label="world" value="key1" />
@@ -84,7 +84,7 @@ class PromptPickerExample extends React.Component<{...}, State> {
       <Picker
         style={styles.picker}
         selectedValue={this.state.value}
-        onValueChange={v => this.setState({value: v})}
+        onValueChange={(v) => this.setState({value: v})}
         prompt="Pick one, just one">
         <Item label="hello" value="key0" />
         <Item label="world" value="key1" />
@@ -106,7 +106,7 @@ class ColorPickerExample extends React.Component<{...}, ColorState> {
         <Picker
           style={[styles.picker, {color: 'white', backgroundColor: '#333'}]}
           selectedValue={this.state.color}
-          onValueChange={v => this.setState({color: v})}
+          onValueChange={(v) => this.setState({color: v})}
           mode="dropdown">
           <Item label="red" color="red" value="red" />
           <Item label="green" color="green" value="green" />
@@ -115,7 +115,7 @@ class ColorPickerExample extends React.Component<{...}, ColorState> {
         <Picker
           style={styles.picker}
           selectedValue={this.state.color}
-          onValueChange={v => this.setState({color: v})}
+          onValueChange={(v) => this.setState({color: v})}
           mode="dialog">
           <Item label="red" color="red" value="red" />
           <Item label="green" color="green" value="green" />
@@ -136,7 +136,7 @@ class AccessibilityLabelPickerExample extends React.Component<{||}, State> {
         accessibilityLabel={this.state.value + 'Hours'}
         style={styles.picker}
         selectedValue={this.state.value}
-        onValueChange={v => this.setState({value: v})}>
+        onValueChange={(v) => this.setState({value: v})}>
         <Item label="1" value="1" />
         <Item label="2" value="2" />
         <Item label="3" value="3" />
@@ -157,37 +157,37 @@ exports.description =
 exports.examples = [
   {
     title: 'Basic Picker',
-    render: function(): React.Element<typeof BasicPickerExample> {
+    render: function (): React.Element<typeof BasicPickerExample> {
       return <BasicPickerExample />;
     },
   },
   {
     title: 'Disabled Picker',
-    render: function(): React.Element<typeof DisabledPickerExample> {
+    render: function (): React.Element<typeof DisabledPickerExample> {
       return <DisabledPickerExample />;
     },
   },
   {
     title: 'Dropdown Picker',
-    render: function(): React.Element<typeof DropdownPickerExample> {
+    render: function (): React.Element<typeof DropdownPickerExample> {
       return <DropdownPickerExample />;
     },
   },
   {
     title: 'Picker with prompt message',
-    render: function(): React.Element<typeof PromptPickerExample> {
+    render: function (): React.Element<typeof PromptPickerExample> {
       return <PromptPickerExample />;
     },
   },
   {
     title: 'Accessibility Label pickers',
-    render: function(): React.Element<typeof AccessibilityLabelPickerExample> {
+    render: function (): React.Element<typeof AccessibilityLabelPickerExample> {
       return <AccessibilityLabelPickerExample />;
     },
   },
   {
     title: 'Picker with no listener',
-    render: function(): React.Element<typeof PromptPickerExample> {
+    render: function (): React.Element<typeof PromptPickerExample> {
       return (
         /* $FlowFixMe(>=0.99.0 site=react_native_fb) This comment suppresses an
          * error found when Flow v0.99 was deployed. To see the error, delete
@@ -207,13 +207,13 @@ exports.examples = [
   },
   {
     title: 'Colorful pickers',
-    render: function(): React.Element<typeof ColorPickerExample> {
+    render: function (): React.Element<typeof ColorPickerExample> {
       return <ColorPickerExample />;
     },
   },
   {
     title: 'AccessibilityLabel pickers',
-    render: function(): React.Element<typeof AccessibilityLabelPickerExample> {
+    render: function (): React.Element<typeof AccessibilityLabelPickerExample> {
       return <AccessibilityLabelPickerExample />;
     },
   },
diff --git a/RNTester/js/examples/Picker/PickerIOSExample.js b/RNTester/js/examples/Picker/PickerIOSExample.js
index 6993c7ad743..81974269363 100644
--- a/RNTester/js/examples/Picker/PickerIOSExample.js
+++ b/RNTester/js/examples/Picker/PickerIOSExample.js
@@ -112,8 +112,8 @@ class PickerExample extends React.Component<{...}, $FlowFixMeState> {
         <Text>Please choose a make for your car:</Text>
         <PickerIOS
           selectedValue={this.state.carMake}
-          onValueChange={carMake => this.setState({carMake, modelIndex: 0})}>
-          {Object.keys(CAR_MAKES_AND_MODELS).map(carMake => (
+          onValueChange={(carMake) => this.setState({carMake, modelIndex: 0})}>
+          {Object.keys(CAR_MAKES_AND_MODELS).map((carMake) => (
             <PickerItemIOS
               key={carMake}
               value={carMake}
@@ -125,7 +125,7 @@ class PickerExample extends React.Component<{...}, $FlowFixMeState> {
         <PickerIOS
           selectedValue={this.state.modelIndex}
           key={this.state.carMake}
-          onValueChange={modelIndex => this.setState({modelIndex})}>
+          onValueChange={(modelIndex) => this.setState({modelIndex})}>
           {CAR_MAKES_AND_MODELS[this.state.carMake].models.map(
             (modelName, modelIndex) => (
               <PickerItemIOS
@@ -158,8 +158,8 @@ class PickerStyleExample extends React.Component<{...}, $FlowFixMeState> {
           fontWeight: 'bold',
         }}
         selectedValue={this.state.carMake}
-        onValueChange={carMake => this.setState({carMake, modelIndex: 0})}>
-        {Object.keys(CAR_MAKES_AND_MODELS).map(carMake => (
+        onValueChange={(carMake) => this.setState({carMake, modelIndex: 0})}>
+        {Object.keys(CAR_MAKES_AND_MODELS).map((carMake) => (
           <PickerItemIOS
             key={carMake}
             value={carMake}
@@ -177,13 +177,13 @@ exports.description = 'Render lists of selectable options with UIPickerView.';
 exports.examples = [
   {
     title: '<PickerIOS>',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <PickerExample />;
     },
   },
   {
     title: '<PickerIOS> with custom styling',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <PickerStyleExample />;
     },
   },
diff --git a/RNTester/js/examples/PointerEvents/PointerEventsExample.js b/RNTester/js/examples/PointerEvents/PointerEventsExample.js
index fcca307e9ea..51bea465c9d 100644
--- a/RNTester/js/examples/PointerEvents/PointerEventsExample.js
+++ b/RNTester/js/examples/PointerEvents/PointerEventsExample.js
@@ -19,7 +19,7 @@ class ExampleBox extends React.Component<$FlowFixMeProps, $FlowFixMeState> {
     log: [],
   };
 
-  handleLog = msg => {
+  handleLog = (msg) => {
     this.state.log = this.state.log.concat([msg]);
   };
 
@@ -193,11 +193,11 @@ const exampleClasses: Array<ExampleClass> = [
   },
 ];
 
-const infoToExample = info => {
+const infoToExample = (info) => {
   return {
     title: info.title,
     description: info.description,
-    render: function() {
+    render: function () {
       return <ExampleBox key={info.title} Component={info.Component} />;
     },
   };
diff --git a/RNTester/js/examples/Pressable/PressableExample.js b/RNTester/js/examples/Pressable/PressableExample.js
index d2155ebc48a..3d27f2bed9b 100644
--- a/RNTester/js/examples/Pressable/PressableExample.js
+++ b/RNTester/js/examples/Pressable/PressableExample.js
@@ -40,7 +40,7 @@ function ContentPress() {
       <View style={styles.row}>
         <Pressable
           onPress={() => {
-            setTimesPressed(current => current + 1);
+            setTimesPressed((current) => current + 1);
           }}>
           {({pressed}) => (
             <Text style={styles.text}>{pressed ? 'Pressed!' : 'Press Me'}</Text>
@@ -70,7 +70,7 @@ function TextOnPressBox() {
         style={styles.textBlock}
         testID="tappable_text"
         onPress={() => {
-          setTimesPressed(prev => prev + 1);
+          setTimesPressed((prev) => prev + 1);
         }}>
         Text has built-in onPress handling
       </Text>
@@ -86,7 +86,7 @@ function PressableFeedbackEvents() {
 
   function appendEvent(eventName) {
     const limit = 6;
-    setEventLog(current => {
+    setEventLog((current) => {
       return [eventName].concat(current.slice(0, limit - 1));
     });
   }
@@ -167,8 +167,8 @@ function ForceTouchExample() {
           style={styles.wrapper}
           testID="pressable_3dtouch_button"
           onStartShouldSetResponder={() => true}
-          onResponderMove={event => setForce(event.nativeEvent.force)}
-          onResponderRelease={event => setForce(0)}>
+          onResponderMove={(event) => setForce(event.nativeEvent.force)}
+          onResponderRelease={(event) => setForce(0)}>
           <Text style={styles.button}>Press Me</Text>
         </View>
       </View>
@@ -190,7 +190,7 @@ function PressableHitSlop() {
     <View testID="pressable_hit_slop">
       <View style={[styles.row, styles.centered]}>
         <Pressable
-          onPress={() => setTimesPressed(num => num + 1)}
+          onPress={() => setTimesPressed((num) => num + 1)}
           style={styles.hitSlopWrapper}
           hitSlop={{top: 30, bottom: 30, left: 60, right: 60}}
           testID="pressable_hit_slop_button">
@@ -346,7 +346,7 @@ exports.examples = [
     title: 'Pressable feedback events',
     description: ('<Pressable> components accept onPress, onPressIn, ' +
       'onPressOut, and onLongPress as props.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <PressableFeedbackEvents />;
     },
   },
@@ -354,7 +354,7 @@ exports.examples = [
     title: 'Pressable with Ripple and Animated child',
     description: ('Pressable can have an AnimatedComponent as a direct child.': string),
     platform: 'android',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const mScale = new Animated.Value(1);
       Animated.timing(mScale, {
         toValue: 0.3,
@@ -378,7 +378,7 @@ exports.examples = [
   },
   {
     title: '<Text onPress={fn}> with highlight',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TextOnPressBox />;
     },
   },
@@ -387,7 +387,7 @@ exports.examples = [
     description: ('<Pressable> also accept delayPressIn, ' +
       'delayPressOut, and delayLongPress as props. These props impact the ' +
       'timing of feedback events.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <PressableDelayEvents />;
     },
   },
@@ -395,7 +395,7 @@ exports.examples = [
     title: '3D Touch / Force Touch',
     description:
       'iPhone 8 and 8 plus support 3D touch, which adds a force property to touches',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <ForceTouchExample />;
     },
     platform: 'ios',
@@ -404,14 +404,14 @@ exports.examples = [
     title: 'Pressable Hit Slop',
     description: ('<Pressable> components accept hitSlop prop which extends the touch area ' +
       'without changing the view bounds.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <PressableHitSlop />;
     },
   },
   {
     title: 'Pressable Native Methods',
     description: ('<Pressable> components expose native methods like `measure`.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <PressableNativeMethods />;
     },
   },
@@ -419,7 +419,7 @@ exports.examples = [
     title: 'Disabled Pressable',
     description: ('<Pressable> components accept disabled prop which prevents ' +
       'any interaction with component': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <PressableDisabled />;
     },
   },
diff --git a/RNTester/js/examples/ProgressBarAndroid/ProgressBarAndroidExample.android.js b/RNTester/js/examples/ProgressBarAndroid/ProgressBarAndroidExample.android.js
index b594fd0e2f5..6e663b6121b 100644
--- a/RNTester/js/examples/ProgressBarAndroid/ProgressBarAndroidExample.android.js
+++ b/RNTester/js/examples/ProgressBarAndroid/ProgressBarAndroidExample.android.js
@@ -87,7 +87,7 @@ exports.description = 'Horizontal bar to show the progress of some operation.';
 exports.examples = [
   {
     title: 'Simple progress bar',
-    render: function(): React.Element<typeof ProgressBarAndroidExample> {
+    render: function (): React.Element<typeof ProgressBarAndroidExample> {
       return <ProgressBarAndroidExample />;
     },
   },
diff --git a/RNTester/js/examples/ProgressViewIOS/ProgressViewIOSExample.js b/RNTester/js/examples/ProgressViewIOS/ProgressViewIOSExample.js
index 95d6885e1a7..ae59546c5d8 100644
--- a/RNTester/js/examples/ProgressViewIOS/ProgressViewIOSExample.js
+++ b/RNTester/js/examples/ProgressViewIOS/ProgressViewIOSExample.js
@@ -42,7 +42,7 @@ class ProgressViewExample extends React.Component<Props, State> {
     this._rafId = requestAnimationFrame(() => this.updateProgress());
   };
 
-  getProgress = offset => {
+  getProgress = (offset) => {
     const progress = this.state.progress + offset;
     return Math.sin(progress % Math.PI) % 1;
   };
diff --git a/RNTester/js/examples/PushNotificationIOS/PushNotificationIOSExample.js b/RNTester/js/examples/PushNotificationIOS/PushNotificationIOSExample.js
index 93127afb755..89724eb54eb 100644
--- a/RNTester/js/examples/PushNotificationIOS/PushNotificationIOSExample.js
+++ b/RNTester/js/examples/PushNotificationIOS/PushNotificationIOSExample.js
@@ -184,7 +184,7 @@ class NotificationPermissionExample extends React.Component<
 
   _requestPermissions = () => {
     PushNotificationIOS.requestPermissions().then(
-      onFulfill => {
+      (onFulfill) => {
         this._showAlert(
           'Successfully requested permissions -- ' +
             'Alert: ' +
@@ -204,7 +204,7 @@ class NotificationPermissionExample extends React.Component<
   };
 
   _checkPermissions = () => {
-    PushNotificationIOS.checkPermissions(permissions => {
+    PushNotificationIOS.checkPermissions((permissions) => {
       this.setState({permissions});
     });
   };
diff --git a/RNTester/js/examples/RTL/RTLExample.js b/RNTester/js/examples/RTL/RTLExample.js
index 2008ea0ca8a..f839cc4a1ec 100644
--- a/RNTester/js/examples/RTL/RTLExample.js
+++ b/RNTester/js/examples/RTL/RTLExample.js
@@ -149,7 +149,7 @@ function withRTLState(Component) {
     }
 
     render() {
-      const setRTL = isRTL => this.setState({isRTL: isRTL});
+      const setRTL = (isRTL) => this.setState({isRTL: isRTL});
       return (
         <Component isRTL={this.state.isRTL} setRTL={setRTL} {...this.props} />
       );
@@ -520,7 +520,7 @@ const BorderExample = withRTLState(({isRTL, setRTL}) => {
   );
 });
 
-const directionStyle = isRTL =>
+const directionStyle = (isRTL) =>
   Platform.OS === 'ios' ? {direction: isRTL ? 'rtl' : 'ltr'} : null;
 
 const styles = StyleSheet.create({
@@ -647,13 +647,13 @@ exports.description = 'Examples to show how to apply components to RTL layout.';
 exports.examples = [
   {
     title: 'Current Layout Direction',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <RTLToggleExample />;
     },
   },
   {
     title: 'A Simple List Item Layout',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <SimpleListItemExample />;
     },
   },
@@ -661,7 +661,7 @@ exports.examples = [
     title: 'Default Text Alignment',
     description: ('In iOS, it depends on active language. ' +
       'In Android, it depends on the text content.': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TextAlignmentExample style={styles.fontSizeSmall} />;
     },
   },
@@ -669,7 +669,7 @@ exports.examples = [
     title: "Using textAlign: 'left'",
     description: ('In iOS/Android, text alignment flips regardless of ' +
       'languages or text content.': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return (
         <TextAlignmentExample
           style={[styles.fontSizeSmall, styles.textAlignLeft]}
@@ -681,7 +681,7 @@ exports.examples = [
     title: "Using textAlign: 'right'",
     description: ('In iOS/Android, text alignment flips regardless of ' +
       'languages or text content.': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return (
         <TextAlignmentExample
           style={[styles.fontSizeSmall, styles.textAlignRight]}
@@ -691,56 +691,56 @@ exports.examples = [
   },
   {
     title: 'Working With Icons',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <IconsExample />;
     },
   },
   {
     title: 'Controlling Animation',
     description: 'Animation direction according to layout',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <AnimationContainer />;
     },
   },
   {
     title: 'Padding Start/End',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <PaddingExample />;
     },
   },
   {
     title: 'Margin Start/End',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <MarginExample />;
     },
   },
   {
     title: 'Position Start/End',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <PositionExample />;
     },
   },
   {
     title: 'Border Width Start/End',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <BorderWidthExample />;
     },
   },
   {
     title: 'Border Color Start/End',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <BorderColorExample />;
     },
   },
   {
     title: 'Border Radii Start/End',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <BorderRadiiExample />;
     },
   },
   {
     title: 'Border',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <BorderExample />;
     },
   },
diff --git a/RNTester/js/examples/RefreshControl/RefreshControlExample.js b/RNTester/js/examples/RefreshControl/RefreshControlExample.js
index 06493b0971b..462b126a4c1 100644
--- a/RNTester/js/examples/RefreshControl/RefreshControlExample.js
+++ b/RNTester/js/examples/RefreshControl/RefreshControlExample.js
@@ -64,7 +64,7 @@ class RefreshControlExample extends React.Component {
     })),
   };
 
-  _onClick = row => {
+  _onClick = (row) => {
     row.clicks++;
     this.setState({
       rowData: this.state.rowData,
@@ -120,7 +120,7 @@ exports.simpleExampleContainer = true;
 exports.examples = [
   {
     title: 'Simple refresh',
-    render: function(): React.Element<typeof RefreshControlExample> {
+    render: function (): React.Element<typeof RefreshControlExample> {
       return <RefreshControlExample />;
     },
   },
diff --git a/RNTester/js/examples/SafeAreaView/SafeAreaViewExample.js b/RNTester/js/examples/SafeAreaView/SafeAreaViewExample.js
index a80d717b972..a29150f5d84 100644
--- a/RNTester/js/examples/SafeAreaView/SafeAreaViewExample.js
+++ b/RNTester/js/examples/SafeAreaView/SafeAreaViewExample.js
@@ -35,7 +35,7 @@ class SafeAreaViewExample extends React.Component<
     emulateUnlessSupported: true,
   };
 
-  _setModalVisible = visible => {
+  _setModalVisible = (visible) => {
     this.setState({modalVisible: visible});
   };
 
@@ -58,7 +58,7 @@ class SafeAreaViewExample extends React.Component<
                 />
                 <Text>emulateUnlessSupported:</Text>
                 <Switch
-                  onValueChange={value =>
+                  onValueChange={(value) =>
                     this.setState({emulateUnlessSupported: value})
                   }
                   value={this.state.emulateUnlessSupported}
@@ -73,7 +73,7 @@ class SafeAreaViewExample extends React.Component<
         />
         <Text>emulateUnlessSupported:</Text>
         <Switch
-          onValueChange={value =>
+          onValueChange={(value) =>
             this.setState({emulateUnlessSupported: value})
           }
           value={this.state.emulateUnlessSupported}
diff --git a/RNTester/js/examples/ScrollView/ScrollViewAnimatedExample.js b/RNTester/js/examples/ScrollView/ScrollViewAnimatedExample.js
index a4a5ffea339..79a53688c5f 100644
--- a/RNTester/js/examples/ScrollView/ScrollViewAnimatedExample.js
+++ b/RNTester/js/examples/ScrollView/ScrollViewAnimatedExample.js
@@ -100,7 +100,7 @@ exports.description = 'Component that is animated when ScrollView is offset.';
 exports.examples = [
   {
     title: 'Animated by scroll view',
-    render: function(): React.Element<typeof ScrollViewAnimatedExample> {
+    render: function (): React.Element<typeof ScrollViewAnimatedExample> {
       return <ScrollViewAnimatedExample />;
     },
   },
diff --git a/RNTester/js/examples/ScrollView/ScrollViewExample.js b/RNTester/js/examples/ScrollView/ScrollViewExample.js
index c00ea24ea83..1e97bd8a02d 100644
--- a/RNTester/js/examples/ScrollView/ScrollViewExample.js
+++ b/RNTester/js/examples/ScrollView/ScrollViewExample.js
@@ -34,12 +34,12 @@ exports.examples = [
     title: '<ScrollView>\n',
     description:
       'To make content scrollable, wrap it within a <ScrollView> component',
-    render: function(): React.Node {
+    render: function (): React.Node {
       let _scrollView: ?React.ElementRef<typeof ScrollView>;
       return (
         <View>
           <ScrollView
-            ref={scrollView => {
+            ref={(scrollView) => {
               _scrollView = scrollView;
             }}
             automaticallyAdjustContentInsets={false}
@@ -76,7 +76,7 @@ exports.examples = [
     title: '<ScrollView> (horizontal = true)\n',
     description:
       "You can display <ScrollView>'s child components horizontally rather than vertically",
-    render: function(): React.Node {
+    render: function (): React.Node {
       function renderScrollView(
         title: string,
         additionalStyles: ViewStyleProp,
@@ -86,7 +86,7 @@ exports.examples = [
           <View style={additionalStyles}>
             <Text style={styles.text}>{title}</Text>
             <ScrollView
-              ref={scrollView => {
+              ref={(scrollView) => {
                 _scrollView = scrollView;
               }}
               automaticallyAdjustContentInsets={false}
@@ -127,7 +127,7 @@ exports.examples = [
   {
     title: '<ScrollView> enable & disable\n',
     description: 'ScrollView scrolling behaviour can be disabled and enabled',
-    render: function(): React.Node {
+    render: function (): React.Node {
       class EnableDisableList extends React.Component<{...}, *> {
         state = {
           scrollEnabled: true,
@@ -170,7 +170,7 @@ if (Platform.OS === 'ios') {
     description:
       'The `maintainVisibleContentPosition` prop allows insertions to either end of the content ' +
       'without causing the visible content to jump. Re-ordering is not supported.',
-    render: function() {
+    render: function () {
       let itemCount = 6;
       class AppendingList extends React.Component<{...}, *> {
         state = {
@@ -191,7 +191,7 @@ if (Platform.OS === 'ios') {
                   autoscrollToTopThreshold: 10,
                 }}
                 style={styles.scrollView}>
-                {this.state.items.map(item =>
+                {this.state.items.map((item) =>
                   React.cloneElement(item, {key: item.props.msg}),
                 )}
               </ScrollView>
@@ -203,7 +203,7 @@ if (Platform.OS === 'ios') {
                   autoscrollToTopThreshold: 10,
                 }}
                 style={[styles.scrollView, styles.horizontalScrollView]}>
-                {this.state.items.map(item =>
+                {this.state.items.map((item) =>
                   React.cloneElement(item, {key: item.props.msg, style: null}),
                 )}
               </ScrollView>
@@ -211,7 +211,7 @@ if (Platform.OS === 'ios') {
                 <Button
                   label="Add to top"
                   onPress={() => {
-                    this.setState(state => {
+                    this.setState((state) => {
                       const idx = itemCount++;
                       return {
                         items: [
@@ -227,7 +227,7 @@ if (Platform.OS === 'ios') {
                 <Button
                   label="Remove top"
                   onPress={() => {
-                    this.setState(state => ({
+                    this.setState((state) => ({
                       items: state.items.slice(1),
                     }));
                   }}
@@ -235,7 +235,7 @@ if (Platform.OS === 'ios') {
                 <Button
                   label="Change height top"
                   onPress={() => {
-                    this.setState(state => ({
+                    this.setState((state) => ({
                       items: [
                         React.cloneElement(state.items[0], {
                           style: {paddingBottom: Math.random() * 40},
@@ -249,7 +249,7 @@ if (Platform.OS === 'ios') {
                 <Button
                   label="Add to end"
                   onPress={() => {
-                    this.setState(state => ({
+                    this.setState((state) => ({
                       items: state.items.concat(
                         <Item msg={`Item ${itemCount++}`} />,
                       ),
@@ -259,7 +259,7 @@ if (Platform.OS === 'ios') {
                 <Button
                   label="Remove end"
                   onPress={() => {
-                    this.setState(state => ({
+                    this.setState((state) => ({
                       items: state.items.slice(0, -1),
                     }));
                   }}
@@ -267,7 +267,7 @@ if (Platform.OS === 'ios') {
                 <Button
                   label="Change height end"
                   onPress={() => {
-                    this.setState(state => ({
+                    this.setState((state) => ({
                       items: state.items.slice(0, -1).concat(
                         React.cloneElement(
                           state.items[state.items.length - 1],
diff --git a/RNTester/js/examples/ScrollView/ScrollViewSimpleExample.js b/RNTester/js/examples/ScrollView/ScrollViewSimpleExample.js
index ae654006496..e6cd32d7b26 100644
--- a/RNTester/js/examples/ScrollView/ScrollViewSimpleExample.js
+++ b/RNTester/js/examples/ScrollView/ScrollViewSimpleExample.js
@@ -98,7 +98,7 @@ exports.description =
 exports.examples = [
   {
     title: 'Simple scroll view',
-    render: function(): React.Element<typeof ScrollViewSimpleExample> {
+    render: function (): React.Element<typeof ScrollViewSimpleExample> {
       return <ScrollViewSimpleExample />;
     },
   },
diff --git a/RNTester/js/examples/SectionList/SectionListExample.js b/RNTester/js/examples/SectionList/SectionListExample.js
index d3b895e6362..1877ab8cd5a 100644
--- a/RNTester/js/examples/SectionList/SectionListExample.js
+++ b/RNTester/js/examples/SectionList/SectionListExample.js
@@ -93,7 +93,7 @@ class SectionListExample extends React.PureComponent<{...}, $FlowFixMeState> {
   );
 
   _sectionListRef: React.ElementRef<typeof Animated.SectionList>;
-  _captureRef = ref => {
+  _captureRef = (ref) => {
     this._sectionListRef = ref;
   };
 
@@ -103,7 +103,7 @@ class SectionListExample extends React.PureComponent<{...}, $FlowFixMeState> {
 
   render(): React.Node {
     const filterRegex = new RegExp(String(this.state.filterText), 'i');
-    const filter = item =>
+    const filter = (item) =>
       filterRegex.test(item.text) || filterRegex.test(item.title);
     const filteredData = this.state.data.filter(filter);
     const filteredSectionData = [];
@@ -122,7 +122,7 @@ class SectionListExample extends React.PureComponent<{...}, $FlowFixMeState> {
       <RNTesterPage noSpacer={true} noScroll={true}>
         <View style={styles.searchRow}>
           <PlainInput
-            onChangeText={filterText => {
+            onChangeText={(filterText) => {
               this.setState(() => ({filterText}));
             }}
             placeholder="Search..."
@@ -156,10 +156,10 @@ class SectionListExample extends React.PureComponent<{...}, $FlowFixMeState> {
           ref={this._captureRef}
           ListHeaderComponent={HeaderComponent}
           ListFooterComponent={FooterComponent}
-          SectionSeparatorComponent={info => (
+          SectionSeparatorComponent={(info) => (
             <CustomSeparatorComponent {...info} text="SECTION SEPARATOR" />
           )}
-          ItemSeparatorComponent={info => (
+          ItemSeparatorComponent={(info) => (
             <CustomSeparatorComponent {...info} text="ITEM SEPARATOR" />
           )}
           debug={this.state.debug}
@@ -294,7 +294,7 @@ exports.description = 'Performant, scrollable list of data.';
 exports.examples = [
   {
     title: 'Simple scrollable list',
-    render: function(): React.Element<typeof SectionListExample> {
+    render: function (): React.Element<typeof SectionListExample> {
       return <SectionListExample />;
     },
   },
diff --git a/RNTester/js/examples/SegmentedControlIOS/SegmentedControlIOSExample.js b/RNTester/js/examples/SegmentedControlIOS/SegmentedControlIOSExample.js
index 0c20da7b148..620f74bc563 100644
--- a/RNTester/js/examples/SegmentedControlIOS/SegmentedControlIOSExample.js
+++ b/RNTester/js/examples/SegmentedControlIOS/SegmentedControlIOSExample.js
@@ -118,13 +118,13 @@ class EventSegmentedControlExample extends React.Component<
     );
   }
 
-  _onChange = event => {
+  _onChange = (event) => {
     this.setState({
       selectedIndex: event.nativeEvent.selectedSegmentIndex,
     });
   };
 
-  _onValueChange = value => {
+  _onValueChange = (value) => {
     this.setState({
       value: value,
     });
diff --git a/RNTester/js/examples/Share/ShareExample.js b/RNTester/js/examples/Share/ShareExample.js
index bf33e7670ae..9bb070d7f25 100644
--- a/RNTester/js/examples/Share/ShareExample.js
+++ b/RNTester/js/examples/Share/ShareExample.js
@@ -64,7 +64,7 @@ class ShareMessageExample extends React.Component<Props, State> {
         'React Native | A framework for building native apps using React',
     })
       .then(this._showResult)
-      .catch(error => this.setState({result: 'error: ' + error.message}));
+      .catch((error) => this.setState({result: 'error: ' + error.message}));
   }
 
   _shareText() {
@@ -82,7 +82,7 @@ class ShareMessageExample extends React.Component<Props, State> {
       },
     )
       .then(this._showResult)
-      .catch(error => this.setState({result: 'error: ' + error.message}));
+      .catch((error) => this.setState({result: 'error: ' + error.message}));
   }
 
   _showResult(result) {
diff --git a/RNTester/js/examples/Slider/SliderExample.js b/RNTester/js/examples/Slider/SliderExample.js
index 7a1fca6c1ff..91290896aac 100644
--- a/RNTester/js/examples/Slider/SliderExample.js
+++ b/RNTester/js/examples/Slider/SliderExample.js
@@ -19,7 +19,7 @@ function SliderExample(props: React.ElementConfig<typeof Slider>) {
   return (
     <View>
       <Text style={styles.text}>{value.toFixed(3)}</Text>
-      <Slider {...props} onValueChange={newValue => setValue(newValue)} />
+      <Slider {...props} onValueChange={(newValue) => setValue(newValue)} />
     </View>
   );
 }
@@ -32,9 +32,9 @@ function SlidingCompleteExample(props: React.ElementConfig<typeof Slider>) {
     <View>
       <SliderExample
         {...props}
-        onSlidingComplete={value => {
+        onSlidingComplete={(value) => {
           setSlideCompletionValue(value);
-          setSlideCompletionCount(count => count + 1);
+          setSlideCompletionCount((count) => count + 1);
         }}
       />
       <Text>
diff --git a/RNTester/js/examples/Snapshot/SnapshotExample.js b/RNTester/js/examples/Snapshot/SnapshotExample.js
index 98378fc7a70..90c2a3be09a 100644
--- a/RNTester/js/examples/Snapshot/SnapshotExample.js
+++ b/RNTester/js/examples/Snapshot/SnapshotExample.js
@@ -39,8 +39,8 @@ class ScreenshotExample extends React.Component<{...}, $FlowFixMeState> {
 
   takeScreenshot = () => {
     ScreenshotManager.takeScreenshot('window', {format: 'jpeg', quality: 0.8}) // See UIManager.js for options
-      .then(uri => this.setState({uri}))
-      .catch(error => Alert.alert(error));
+      .then((uri) => this.setState({uri}))
+      .catch((error) => Alert.alert(error));
   };
 }
 
diff --git a/RNTester/js/examples/Switch/SwitchExample.js b/RNTester/js/examples/Switch/SwitchExample.js
index ce825594e11..3774b35787b 100644
--- a/RNTester/js/examples/Switch/SwitchExample.js
+++ b/RNTester/js/examples/Switch/SwitchExample.js
@@ -53,7 +53,7 @@ class BasicSwitchExample extends React.Component<
         <ExampleRow>
           <Switch
             testID="on-off-initial-off"
-            onValueChange={value => this.setState({falseSwitchIsOn: value})}
+            onValueChange={(value) => this.setState({falseSwitchIsOn: value})}
             trackColor={{
               true: 'yellow',
               false: 'purple',
@@ -68,7 +68,7 @@ class BasicSwitchExample extends React.Component<
         <ExampleRow>
           <Switch
             testID="on-off-initial-on"
-            onValueChange={value => this.setState({trueSwitchIsOn: value})}
+            onValueChange={(value) => this.setState({trueSwitchIsOn: value})}
             value={this.state.trueSwitchIsOn}
           />
           <OnOffIndicator
@@ -97,7 +97,7 @@ class DisabledSwitchExample extends React.Component<
           <Switch
             testID="disabled-initial-off"
             disabled={true}
-            onValueChange={value => this.setState({falseSwitchIsOn: value})}
+            onValueChange={(value) => this.setState({falseSwitchIsOn: value})}
             value={this.state.falseSwitchIsOn}
           />
 
@@ -111,7 +111,7 @@ class DisabledSwitchExample extends React.Component<
           <Switch
             testID="disabled-initial-on"
             disabled={true}
-            onValueChange={value => this.setState({trueSwitchIsOn: value})}
+            onValueChange={(value) => this.setState({trueSwitchIsOn: value})}
             value={this.state.trueSwitchIsOn}
           />
 
@@ -135,7 +135,9 @@ class ColorSwitchExample extends React.Component<{...}, $FlowFixMeState> {
     return (
       <View>
         <Switch
-          onValueChange={value => this.setState({colorFalseSwitchIsOn: value})}
+          onValueChange={(value) =>
+            this.setState({colorFalseSwitchIsOn: value})
+          }
           style={{marginBottom: 10}}
           thumbColor="#0000ff"
           trackColor={{
@@ -145,7 +147,7 @@ class ColorSwitchExample extends React.Component<{...}, $FlowFixMeState> {
           value={this.state.colorFalseSwitchIsOn}
         />
         <Switch
-          onValueChange={value => this.setState({colorTrueSwitchIsOn: value})}
+          onValueChange={(value) => this.setState({colorTrueSwitchIsOn: value})}
           thumbColor="#0000ff"
           trackColor={{
             false: '#ff0000',
@@ -169,12 +171,12 @@ class EventSwitchExample extends React.Component<{...}, $FlowFixMeState> {
       <View style={{flexDirection: 'row', justifyContent: 'space-around'}}>
         <View>
           <Switch
-            onValueChange={value => this.setState({eventSwitchIsOn: value})}
+            onValueChange={(value) => this.setState({eventSwitchIsOn: value})}
             style={{marginBottom: 10}}
             value={this.state.eventSwitchIsOn}
           />
           <Switch
-            onValueChange={value => this.setState({eventSwitchIsOn: value})}
+            onValueChange={(value) => this.setState({eventSwitchIsOn: value})}
             style={{marginBottom: 10}}
             value={this.state.eventSwitchIsOn}
           />
@@ -182,14 +184,14 @@ class EventSwitchExample extends React.Component<{...}, $FlowFixMeState> {
         </View>
         <View>
           <Switch
-            onValueChange={value =>
+            onValueChange={(value) =>
               this.setState({eventSwitchRegressionIsOn: value})
             }
             style={{marginBottom: 10}}
             value={this.state.eventSwitchRegressionIsOn}
           />
           <Switch
-            onValueChange={value =>
+            onValueChange={(value) =>
               this.setState({eventSwitchRegressionIsOn: value})
             }
             style={{marginBottom: 10}}
diff --git a/RNTester/js/examples/TVEventHandler/TVEventHandlerExample.js b/RNTester/js/examples/TVEventHandler/TVEventHandlerExample.js
index 2980bc12745..eb7f986c1bc 100644
--- a/RNTester/js/examples/TVEventHandler/TVEventHandlerExample.js
+++ b/RNTester/js/examples/TVEventHandler/TVEventHandlerExample.js
@@ -29,7 +29,7 @@ class TVEventHandlerView extends React.Component<Props, State> {
 
   _enableTVEventHandler() {
     this._tvEventHandler = new TVEventHandler();
-    this._tvEventHandler.enable(this, function(cmp, evt) {
+    this._tvEventHandler.enable(this, function (cmp, evt) {
       cmp.setState({
         lastEventType: evt.eventType,
       });
diff --git a/RNTester/js/examples/Text/TextExample.android.js b/RNTester/js/examples/Text/TextExample.android.js
index 72813a71cd9..f9e64c9cb45 100644
--- a/RNTester/js/examples/Text/TextExample.android.js
+++ b/RNTester/js/examples/Text/TextExample.android.js
@@ -857,7 +857,7 @@ exports.description = 'Base component for rendering styled text.';
 exports.examples = [
   {
     title: 'Basic text',
-    render: function(): React.Element<typeof TextExample> {
+    render: function (): React.Element<typeof TextExample> {
       return <TextExample />;
     },
   },
diff --git a/RNTester/js/examples/Text/TextExample.ios.js b/RNTester/js/examples/Text/TextExample.ios.js
index c87e9433143..c7d4591a4a9 100644
--- a/RNTester/js/examples/Text/TextExample.ios.js
+++ b/RNTester/js/examples/Text/TextExample.ios.js
@@ -407,7 +407,7 @@ class TextRenderInfoExample extends React.Component<*, *> {
           />
           <Text
             style={{fontSize: this.state.fontSize}}
-            onTextLayout={event => {
+            onTextLayout={(event) => {
               const {lines} = event.nativeEvent;
               if (lines.length > 0) {
                 this.setState({textMetrics: lines[lines.length - 1]});
@@ -455,7 +455,7 @@ class TextWithCapBaseBox extends React.Component<*, *> {
   render() {
     return (
       <Text
-        onTextLayout={event => {
+        onTextLayout={(event) => {
           const {lines} = event.nativeEvent;
           if (lines.length > 0) {
             this.setState({textMetrics: lines[0]});
@@ -485,7 +485,7 @@ exports.displayName = 'TextExample';
 exports.examples = [
   {
     title: 'Wrap',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Text>
           The text should wrap if it goes on multiple lines. See, this is going
@@ -496,13 +496,13 @@ exports.examples = [
   },
   {
     title: "Substring Emoji (should only see 'test')",
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <Text>{'test🙃'.substring(0, 5)}</Text>;
     },
   },
   {
     title: 'Transparent Background Color',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Text style={{backgroundColor: '#00000020', padding: 10}}>
           Text in a gray box!
@@ -515,7 +515,7 @@ exports.examples = [
   },
   {
     title: 'Text metrics',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TextRenderInfoExample />;
     },
   },
@@ -533,7 +533,7 @@ exports.examples = [
   },
   {
     title: 'Padding',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Text style={{padding: 10}}>
           This text is indented by 10px padding on all sides.
@@ -543,7 +543,7 @@ exports.examples = [
   },
   {
     title: 'Font Family',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{fontFamily: Platform.isTV ? 'Times' : 'Cochin'}}>
@@ -576,7 +576,7 @@ exports.examples = [
   },
   {
     title: 'Font Size',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{fontSize: 23}}>Size 23</Text>
@@ -587,7 +587,7 @@ exports.examples = [
   },
   {
     title: 'Color',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{color: 'red'}}>Red color</Text>
@@ -598,7 +598,7 @@ exports.examples = [
   },
   {
     title: 'Font Weight',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{fontSize: 20, fontWeight: '100'}}>
@@ -622,7 +622,7 @@ exports.examples = [
   },
   {
     title: 'Font Style',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{fontStyle: 'normal'}}>Normal text</Text>
@@ -633,7 +633,7 @@ exports.examples = [
   },
   {
     title: 'Selectable',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text selectable={true}>
@@ -646,7 +646,7 @@ exports.examples = [
   },
   {
     title: 'Text Decoration',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text
@@ -724,7 +724,7 @@ exports.examples = [
     description: ('Nested text components will inherit the styles of their ' +
       'parents (only backgroundColor is inherited from non-Text parents).  ' +
       '<Text> only supports other <Text> and raw text (strings) as children.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text>
@@ -762,7 +762,7 @@ exports.examples = [
   },
   {
     title: 'Text Align',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text>auto (default) - english LTR</Text>
@@ -794,7 +794,7 @@ exports.examples = [
   },
   {
     title: 'Letter Spacing',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{letterSpacing: 0}}>letterSpacing = 0</Text>
@@ -838,7 +838,7 @@ exports.examples = [
   },
   {
     title: 'Spaces',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Text>
           A {'generated'} {'string'} and some &nbsp;&nbsp;&nbsp; spaces
@@ -848,7 +848,7 @@ exports.examples = [
   },
   {
     title: 'Line Height',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Text>
           <Text style={{lineHeight: 35}}>
@@ -862,20 +862,20 @@ exports.examples = [
   {
     title: 'Empty Text',
     description: "It's ok to have Text with zero or null children.",
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <Text />;
     },
   },
   {
     title: 'Toggling Attributes',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <AttributeToggler />;
     },
   },
   {
     title: 'backgroundColor attribute',
     description: 'backgroundColor is inherited from all types of views.',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <Text style={{backgroundColor: 'yellow'}}>
           Yellow container background,
@@ -901,7 +901,7 @@ exports.examples = [
   },
   {
     title: 'numberOfLines attribute',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text numberOfLines={1}>
@@ -922,7 +922,7 @@ exports.examples = [
   },
   {
     title: 'Text highlighting (tap the link to see highlight)',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text>
@@ -948,7 +948,7 @@ exports.examples = [
   },
   {
     title: 'allowFontScaling attribute',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text>
@@ -996,7 +996,7 @@ exports.examples = [
   },
   {
     title: 'Text shadow',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text
@@ -1014,7 +1014,7 @@ exports.examples = [
   },
   {
     title: 'Ellipsize mode',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text numberOfLines={1}>
@@ -1035,7 +1035,7 @@ exports.examples = [
   },
   {
     title: 'Font variants',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{fontVariant: ['small-caps']}}>Small Caps{'\n'}</Text>
@@ -1069,7 +1069,7 @@ exports.examples = [
   },
   {
     title: 'Nested content',
-    render: function(): React.Node {
+    render: function (): React.Node {
       // iOS-only because it relies on inline views being able to size to content.
       // Android's implementation requires that a width and height be specified
       // on the inline view.
@@ -1097,25 +1097,25 @@ exports.examples = [
   },
   {
     title: 'Dynamic Font Size Adjustment',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <AdjustingFontSize />;
     },
   },
   {
     title: 'Text Align with RTL',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TextAlignRTLExample />;
     },
   },
   {
     title: "Text `alignItems: 'baseline'` style",
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TextBaseLineLayoutExample />;
     },
   },
   {
     title: 'Transform',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text style={{textTransform: 'uppercase'}}>
diff --git a/RNTester/js/examples/TextInput/TextInputExample.android.js b/RNTester/js/examples/TextInput/TextInputExample.android.js
index 6306cd60387..a9848f59d1c 100644
--- a/RNTester/js/examples/TextInput/TextInputExample.android.js
+++ b/RNTester/js/examples/TextInput/TextInputExample.android.js
@@ -87,7 +87,7 @@ class AutogrowingTextInputExample extends React.Component<{...}> {
           step={10}
           /* $FlowFixMe(>=0.78.0 site=react_native_android_fb) This issue was
            * found when making Flow check .android.js files. */
-          onValueChange={value => this.setState({width: value})}
+          onValueChange={(value) => this.setState({width: value})}
         />
         <Text>Multiline:</Text>
         <Switch
@@ -96,7 +96,7 @@ class AutogrowingTextInputExample extends React.Component<{...}> {
           value={this.state.multiline}
           /* $FlowFixMe(>=0.78.0 site=react_native_android_fb) This issue was
            * found when making Flow check .android.js files. */
-          onValueChange={value => this.setState({multiline: value})}
+          onValueChange={(value) => this.setState({multiline: value})}
         />
         <Text>TextInput:</Text>
         <TextInput
@@ -108,8 +108,8 @@ class AutogrowingTextInputExample extends React.Component<{...}> {
           style={[style, {width: this.state.width + '%'}]}
           /* $FlowFixMe(>=0.78.0 site=react_native_android_fb) This issue was
            * found when making Flow check .android.js files. */
-          onChangeText={value => this.setState({text: value})}
-          onContentSizeChange={event =>
+          onChangeText={(value) => this.setState({text: value})}
+          onContentSizeChange={(event) =>
             /* $FlowFixMe(>=0.78.0 site=react_native_android_fb) This issue was
              * found when making Flow check .android.js files. */
             this.setState({contentSize: event.nativeEvent.contentSize})
@@ -149,7 +149,7 @@ exports.examples = ([
   ...TextInputSharedExamples,
   {
     title: 'Colors and text inputs',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -199,7 +199,7 @@ exports.examples = ([
   },
   {
     title: 'Text input, themes and heights',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <TextInput
           placeholder="If you set height, beware of padding set from themes"
@@ -210,7 +210,7 @@ exports.examples = ([
   },
   {
     title: 'letterSpacing',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -235,7 +235,7 @@ exports.examples = ([
   },
   {
     title: 'Passwords',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -255,7 +255,7 @@ exports.examples = ([
   },
   {
     title: 'Editable',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <TextInput
           defaultValue="Can't touch this! (>'-')> ^(' - ')^ <('-'<) (>'-')> ^(' - ')^"
@@ -267,7 +267,7 @@ exports.examples = ([
   },
   {
     title: 'Multiline',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -309,7 +309,7 @@ exports.examples = ([
   {
     title: 'Fixed number of lines',
     platform: 'android',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -328,7 +328,7 @@ exports.examples = ([
   },
   {
     title: 'Auto-expanding',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <AutogrowingTextInputExample
@@ -352,7 +352,7 @@ exports.examples = ([
   },
   {
     title: 'Return key',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const returnKeyTypes = [
         'none',
         'go',
@@ -363,7 +363,7 @@ exports.examples = ([
         'next',
       ];
       const returnKeyLabels = ['Compile', 'React Native'];
-      const examples = returnKeyTypes.map(type => {
+      const examples = returnKeyTypes.map((type) => {
         return (
           <TextInput
             key={type}
@@ -373,7 +373,7 @@ exports.examples = ([
           />
         );
       });
-      const types = returnKeyLabels.map(type => {
+      const types = returnKeyLabels.map((type) => {
         return (
           <TextInput
             key={type}
@@ -393,7 +393,7 @@ exports.examples = ([
   },
   {
     title: 'Inline Images',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -417,7 +417,7 @@ exports.examples = ([
   },
   {
     title: 'Toggle Default Padding',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <ToggleDefaultPaddingExample />;
     },
   },
diff --git a/RNTester/js/examples/TextInput/TextInputExample.ios.js b/RNTester/js/examples/TextInput/TextInputExample.ios.js
index 7e1673070e0..43ed75feb27 100644
--- a/RNTester/js/examples/TextInput/TextInputExample.ios.js
+++ b/RNTester/js/examples/TextInput/TextInputExample.ios.js
@@ -54,7 +54,7 @@ class TextInputAccessoryViewExample extends React.Component<{...}, *> {
         <TextInput
           style={styles.default}
           inputAccessoryViewID={inputAccessoryViewID}
-          onChangeText={text => this.setState({text})}
+          onChangeText={(text) => this.setState({text})}
           value={this.state.text}
         />
         <InputAccessoryView nativeID={inputAccessoryViewID}>
@@ -80,7 +80,7 @@ class RewriteExampleKana extends React.Component<$FlowFixMeProps, any> {
       <View style={styles.rewriteContainer}>
         <TextInput
           multiline={false}
-          onChangeText={text => {
+          onChangeText={(text) => {
             this.setState({text: text.replace(/ひ/g, '日')});
           }}
           style={styles.default}
@@ -107,7 +107,7 @@ class SecureEntryExample extends React.Component<$FlowFixMeProps, any> {
           secureTextEntry={true}
           style={styles.default}
           defaultValue="abc"
-          onChangeText={text => this.setState({text})}
+          onChangeText={(text) => this.setState({text})}
           value={this.state.text}
         />
         <Text>Current text is: {this.state.text}</Text>
@@ -119,12 +119,12 @@ class SecureEntryExample extends React.Component<$FlowFixMeProps, any> {
           <TextInput
             style={styles.default}
             defaultValue="cde"
-            onChangeText={text => this.setState({password: text})}
+            onChangeText={(text) => this.setState({password: text})}
             secureTextEntry={this.state.isSecureTextEntry}
             value={this.state.password}
           />
           <Switch
-            onValueChange={value => {
+            onValueChange={(value) => {
               this.setState({isSecureTextEntry: value});
             }}
             style={{marginLeft: 4}}
@@ -170,20 +170,20 @@ class AutogrowingTextInputExample extends React.Component<
           minimumValue={0}
           maximumValue={100}
           step={10}
-          onValueChange={value => this.setState({width: value})}
+          onValueChange={(value) => this.setState({width: value})}
         />
         <Text>Multiline:</Text>
         <Switch
           value={this.state.multiline}
-          onValueChange={value => this.setState({multiline: value})}
+          onValueChange={(value) => this.setState({multiline: value})}
         />
         <Text>TextInput:</Text>
         <TextInput
           value="prop"
           multiline={this.state.multiline}
           style={[style, {width: this.state.width + '%'}]}
-          onChangeText={value => this.setState({text: value})}
-          onContentSizeChange={event =>
+          onChangeText={(value) => this.setState({text: value})}
+          onContentSizeChange={(event) =>
             this.setState({contentSize: event.nativeEvent.contentSize})
           }
           {...props}
@@ -261,19 +261,19 @@ exports.examples = ([
   ...TextInputSharedExamples,
   {
     title: 'Live Re-Write (ひ -> 日)',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <RewriteExampleKana />;
     },
   },
   {
     title: 'Keyboard Accessory View',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TextInputAccessoryViewExample />;
     },
   },
   {
     title: 'Nested content and `value` property',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="singleline">
@@ -299,9 +299,9 @@ exports.examples = ([
   },
   {
     title: 'Keyboard appearance',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const keyboardAppearance = ['default', 'light', 'dark'];
-      const examples = keyboardAppearance.map(type => {
+      const examples = keyboardAppearance.map((type) => {
         return (
           <WithLabel key={type} label={type}>
             <TextInput keyboardAppearance={type} style={styles.default} />
@@ -313,7 +313,7 @@ exports.examples = ([
   },
   {
     title: 'Return key types',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const returnKeyTypes = [
         'default',
         'go',
@@ -327,7 +327,7 @@ exports.examples = ([
         'done',
         'emergency-call',
       ];
-      const examples = returnKeyTypes.map(type => {
+      const examples = returnKeyTypes.map((type) => {
         return (
           <WithLabel key={type} label={type}>
             <TextInput returnKeyType={type} style={styles.default} />
@@ -339,7 +339,7 @@ exports.examples = ([
   },
   {
     title: 'Enable return key automatically',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="true">
@@ -354,13 +354,13 @@ exports.examples = ([
   },
   {
     title: 'Secure text entry',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <SecureEntryExample />;
     },
   },
   {
     title: 'Colored input text',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -377,7 +377,7 @@ exports.examples = ([
   },
   {
     title: 'Colored highlight/cursor for text input',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -396,14 +396,14 @@ exports.examples = ([
   },
   {
     title: 'Clear button mode',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const clearButtonModes = [
         'never',
         'while-editing',
         'unless-editing',
         'always',
       ];
-      const examples = clearButtonModes.map(mode => {
+      const examples = clearButtonModes.map((mode) => {
         return (
           <WithLabel key={mode} label={mode}>
             <TextInput
@@ -419,7 +419,7 @@ exports.examples = ([
   },
   {
     title: 'Clear and select',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="clearTextOnFocus">
@@ -462,7 +462,7 @@ exports.examples = ([
   },
   {
     title: 'Multiline blur on submit',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -471,7 +471,7 @@ exports.examples = ([
             returnKeyType="next"
             blurOnSubmit={true}
             multiline={true}
-            onSubmitEditing={event =>
+            onSubmitEditing={(event) =>
               Alert.alert('Alert', event.nativeEvent.text)
             }
           />
@@ -481,7 +481,7 @@ exports.examples = ([
   },
   {
     title: 'Multiline',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -524,7 +524,7 @@ exports.examples = ([
   },
   {
     title: 'TextInput Intrinsic Size',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <Text>Singleline TextInput</Text>
@@ -591,7 +591,7 @@ exports.examples = ([
   },
   {
     title: 'Auto-expanding',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TextInput
@@ -608,7 +608,7 @@ exports.examples = ([
   },
   {
     title: 'Auto-expanding',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <AutogrowingTextInputExample
@@ -639,7 +639,7 @@ exports.examples = ([
   },
   {
     title: 'TextInput maxLength',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="maxLength: 5">
@@ -672,7 +672,7 @@ exports.examples = ([
   },
   {
     title: 'Text Content Type',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="emailAddress">
@@ -687,7 +687,7 @@ exports.examples = ([
   },
   {
     title: 'TextInput Placeholder Styles',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="letterSpacing: 10 lineHeight: 20 textAlign: 'center'">
diff --git a/RNTester/js/examples/TextInput/TextInputSharedExamples.js b/RNTester/js/examples/TextInput/TextInputSharedExamples.js
index 3ca4b958e06..9e39640f259 100644
--- a/RNTester/js/examples/TextInput/TextInputSharedExamples.js
+++ b/RNTester/js/examples/TextInput/TextInputSharedExamples.js
@@ -101,7 +101,7 @@ class RewriteExample extends React.Component<$FlowFixMeProps, any> {
           autoCorrect={false}
           multiline={false}
           maxLength={limit}
-          onChangeText={text => {
+          onChangeText={(text) => {
             text = text.replace(/ /g, '_');
             this.setState({text});
           }}
@@ -131,7 +131,7 @@ class RewriteExampleInvalidCharacters extends React.Component<
           testID="rewrite_no_sp_input"
           autoCorrect={false}
           multiline={false}
-          onChangeText={text => {
+          onChangeText={(text) => {
             this.setState({text: text.replace(/\s/g, '')});
           }}
           style={styles.default}
@@ -158,11 +158,11 @@ class RewriteInvalidCharactersAndClearExample extends React.Component<
         <TextInput
           testID="rewrite_clear_input"
           autoCorrect={false}
-          ref={ref => {
+          ref={(ref) => {
             this.inputRef = ref;
           }}
           multiline={false}
-          onChangeText={text => {
+          onChangeText={(text) => {
             this.setState({text: text.replace(/\s/g, '')});
           }}
           style={styles.default}
@@ -183,7 +183,7 @@ class RewriteInvalidCharactersAndClearExample extends React.Component<
 }
 
 class BlurOnSubmitExample extends React.Component<{...}> {
-  focusNextField = nextField => {
+  focusNextField = (nextField) => {
     this.refs[nextField].focus();
   };
 
@@ -244,8 +244,8 @@ class TextEventsExample extends React.Component<{...}, $FlowFixMeState> {
     prev3Text: '<No Event>',
   };
 
-  updateText = text => {
-    this.setState(state => {
+  updateText = (text) => {
+    this.setState((state) => {
       return {
         curText: text,
         prevText: state.curText,
@@ -265,22 +265,22 @@ class TextEventsExample extends React.Component<{...}, $FlowFixMeState> {
           multiline
           onFocus={() => this.updateText('onFocus')}
           onBlur={() => this.updateText('onBlur')}
-          onChange={event =>
+          onChange={(event) =>
             this.updateText('onChange text: ' + event.nativeEvent.text)
           }
-          onContentSizeChange={event =>
+          onContentSizeChange={(event) =>
             this.updateText(
               'onContentSizeChange size: ' +
                 JSON.stringify(event.nativeEvent.contentSize),
             )
           }
-          onEndEditing={event =>
+          onEndEditing={(event) =>
             this.updateText('onEndEditing text: ' + event.nativeEvent.text)
           }
-          onSubmitEditing={event =>
+          onSubmitEditing={(event) =>
             this.updateText('onSubmitEditing text: ' + event.nativeEvent.text)
           }
-          onKeyPress={event =>
+          onKeyPress={(event) =>
             this.updateText('onKeyPress key: ' + event.nativeEvent.key)
           }
           style={styles.singleLine}
@@ -332,7 +332,7 @@ class TokenizedTextExample extends React.Component<
     parts.push(_text);
 
     //highlight hashtags
-    parts = parts.map(text => {
+    parts = parts.map((text) => {
       if (/^#/.test(text)) {
         return (
           <Text key={text} style={styles.hashtag}>
@@ -349,7 +349,7 @@ class TokenizedTextExample extends React.Component<
         <TextInput
           multiline={true}
           style={styles.multiline}
-          onChangeText={text => {
+          onChangeText={(text) => {
             this.setState({text});
           }}>
           <Text>{parts}</Text>
@@ -419,9 +419,9 @@ class SelectionExample extends React.Component<
       <View>
         <TextInput
           multiline={this.props.multiline}
-          onChangeText={value => this.setState({value})}
+          onChangeText={(value) => this.setState({value})}
           onSelectionChange={this.onSelectionChange.bind(this)}
-          ref={textInput => (this._textInput = textInput)}
+          ref={(textInput) => (this._textInput = textInput)}
           selection={this.state.selection}
           style={this.props.style}
           value={this.state.value}
@@ -446,7 +446,7 @@ class SelectionExample extends React.Component<
 module.exports = ([
   {
     title: 'Auto-focus',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <TextInput
           autoFocus={true}
@@ -458,25 +458,25 @@ module.exports = ([
   },
   {
     title: "Live Re-Write (<sp>  ->  '_') + maxLength",
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <RewriteExample />;
     },
   },
   {
     title: 'Live Re-Write (no spaces allowed)',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <RewriteExampleInvalidCharacters />;
     },
   },
   {
     title: 'Live Re-Write (no spaces allowed) and clear',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <RewriteInvalidCharactersAndClearExample />;
     },
   },
   {
     title: 'Auto-capitalize',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="none">
@@ -497,7 +497,7 @@ module.exports = ([
   },
   {
     title: 'Auto-correct',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <WithLabel label="true">
@@ -512,7 +512,7 @@ module.exports = ([
   },
   {
     title: 'Keyboard types',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const keyboardTypes = [
         'default',
         'ascii-capable',
@@ -528,7 +528,7 @@ module.exports = ([
         'ascii-capable-number-pad',
         'numeric',
       ];
-      const examples = keyboardTypes.map(type => {
+      const examples = keyboardTypes.map((type) => {
         return (
           <WithLabel key={type} label={type}>
             <TextInput keyboardType={type} style={styles.default} />
@@ -540,19 +540,19 @@ module.exports = ([
   },
   {
     title: 'Blur on submit',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <BlurOnSubmitExample />;
     },
   },
   {
     title: 'Event handling',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TextEventsExample />;
     },
   },
   {
     title: 'fontFamily, fontWeight and fontStyle',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const fontFamilyA = Platform.OS === 'ios' ? 'Cochin' : 'sans-serif';
       const fontFamilyB = Platform.OS === 'ios' ? 'Courier' : 'serif';
 
@@ -593,13 +593,13 @@ module.exports = ([
   },
   {
     title: 'Attributed text',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TokenizedTextExample />;
     },
   },
   {
     title: 'Text selection & cursor placement',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <SelectionExample
diff --git a/RNTester/js/examples/Timer/TimerExample.js b/RNTester/js/examples/Timer/TimerExample.js
index de13ae9f845..7d04ef09d89 100644
--- a/RNTester/js/examples/Timer/TimerExample.js
+++ b/RNTester/js/examples/Timer/TimerExample.js
@@ -77,7 +77,7 @@ class RequestIdleCallbackTester extends React.Component<
       this._idleTimer = null;
     }
 
-    this._idleTimer = requestIdleCallback(deadline => {
+    this._idleTimer = requestIdleCallback((deadline) => {
       let message = '';
 
       if (shouldBurnCPU) {
@@ -97,7 +97,7 @@ class RequestIdleCallbackTester extends React.Component<
     }
 
     this._idleTimer = requestIdleCallback(
-      deadline => {
+      (deadline) => {
         this.setState({
           message: `${deadline.timeRemaining()}ms remaining in frame, it did timeout: ${
             deadline.didTimeout ? 'yes' : 'no'
@@ -115,7 +115,7 @@ class RequestIdleCallbackTester extends React.Component<
       this._idleTimer = null;
     }
 
-    const handler = deadline => {
+    const handler = (deadline) => {
       while (deadline.timeRemaining() > 5) {
         burnCPU(5);
         this.setState({
@@ -272,7 +272,7 @@ exports.examples = [
     description: ('Execute function fn t milliseconds in the future.  If ' +
       't === 0, it will be enqueued immediately in the next event loop.  ' +
       'Larger values will fire on the closest frame.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TimerTester type="setTimeout" dt={0} />
@@ -285,7 +285,7 @@ exports.examples = [
   {
     title: 'this.requestAnimationFrame(fn)',
     description: 'Execute function fn on the next frame.',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TimerTester type="requestAnimationFrame" />
@@ -296,7 +296,7 @@ exports.examples = [
   {
     title: 'this.requestIdleCallback(fn)',
     description: 'Execute function fn on the next JS frame that has idle time',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <RequestIdleCallbackTester />
@@ -307,7 +307,7 @@ exports.examples = [
   {
     title: 'this.setImmediate(fn)',
     description: 'Execute function fn at the end of the current JS event loop.',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <View>
           <TimerTester type="setImmediate" />
@@ -319,7 +319,7 @@ exports.examples = [
     title: 'this.setInterval(fn, t)',
     description: ('Execute function fn every t milliseconds until cancelled ' +
       'or component is unmounted.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       type IntervalExampleProps = $ReadOnly<{||}>;
       type IntervalExampleState = {|
         showTimer: boolean,
@@ -350,7 +350,7 @@ exports.examples = [
           return (
             <View>
               <TimerTester
-                ref={ref => (this._timerTester = ref)}
+                ref={(ref) => (this._timerTester = ref)}
                 dt={25}
                 type="setInterval"
               />
diff --git a/RNTester/js/examples/ToastAndroid/ToastAndroidExample.android.js b/RNTester/js/examples/ToastAndroid/ToastAndroidExample.android.js
index 27ac0e49cff..a33d05127f4 100644
--- a/RNTester/js/examples/ToastAndroid/ToastAndroidExample.android.js
+++ b/RNTester/js/examples/ToastAndroid/ToastAndroidExample.android.js
@@ -129,7 +129,7 @@ exports.description =
 exports.examples = [
   {
     title: 'Basic toast',
-    render: function(): React.Element<typeof ToastExample> {
+    render: function (): React.Element<typeof ToastExample> {
       return <ToastExample />;
     },
   },
diff --git a/RNTester/js/examples/Touchable/TouchableExample.js b/RNTester/js/examples/Touchable/TouchableExample.js
index 8389c580543..e9b92abeabe 100644
--- a/RNTester/js/examples/Touchable/TouchableExample.js
+++ b/RNTester/js/examples/Touchable/TouchableExample.js
@@ -183,7 +183,7 @@ class TouchableFeedbackEvents extends React.Component<{...}, $FlowFixMeState> {
     );
   }
 
-  _appendEvent = eventName => {
+  _appendEvent = (eventName) => {
     const limit = 6;
     const eventLog = this.state.eventLog.slice(0, limit - 1);
     eventLog.unshift(eventName);
@@ -224,7 +224,7 @@ class TouchableDelayEvents extends React.Component<{...}, $FlowFixMeState> {
     );
   }
 
-  _appendEvent = eventName => {
+  _appendEvent = (eventName) => {
     const limit = 6;
     const eventLog = this.state.eventLog.slice(0, limit - 1);
     eventLog.unshift(eventName);
@@ -254,10 +254,10 @@ class ForceTouchExample extends React.Component<{...}, $FlowFixMeState> {
             style={styles.wrapper}
             testID="touchable_3dtouch_button"
             onStartShouldSetResponder={() => true}
-            onResponderMove={event =>
+            onResponderMove={(event) =>
               this.setState({force: event.nativeEvent.force})
             }
-            onResponderRelease={event => this.setState({force: 0})}>
+            onResponderRelease={(event) => this.setState({force: 0})}>
             <Text style={styles.button}>Press Me</Text>
           </View>
         </View>
@@ -560,13 +560,13 @@ exports.examples = [
       'child view is fully opaque, although it can be made to work as a simple ' +
       'background color change as well with the activeOpacity and ' +
       'underlayColor props.': string),
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TouchableHighlightBox />;
     },
   },
   {
     title: '<TouchableWithoutFeedback>',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return <TouchableWithoutFeedbackBox />;
     },
   },
@@ -575,7 +575,7 @@ exports.examples = [
     description: ('TouchableNativeFeedback can have an AnimatedComponent as a' +
       'direct child.': string),
     platform: 'android',
-    render: function(): React.Node {
+    render: function (): React.Node {
       const mScale = new Animated.Value(1);
       Animated.timing(mScale, {
         toValue: 0.3,
@@ -601,7 +601,7 @@ exports.examples = [
   },
   {
     title: '<Text onPress={fn}> with highlight',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TextOnPressBox />;
     },
   },
@@ -609,7 +609,7 @@ exports.examples = [
     title: 'Touchable feedback events',
     description: ('<Touchable*> components accept onPress, onPressIn, ' +
       'onPressOut, and onLongPress as props.': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TouchableFeedbackEvents />;
     },
   },
@@ -618,7 +618,7 @@ exports.examples = [
     description: ('<Touchable*> components also accept delayPressIn, ' +
       'delayPressOut, and delayLongPress as props. These props impact the ' +
       'timing of feedback events.': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TouchableDelayEvents />;
     },
   },
@@ -626,7 +626,7 @@ exports.examples = [
     title: '3D Touch / Force Touch',
     description:
       'iPhone 8 and 8 plus support 3D touch, which adds a force property to touches',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <ForceTouchExample />;
     },
     platform: 'ios',
@@ -635,14 +635,14 @@ exports.examples = [
     title: 'Touchable Hit Slop',
     description: ('<Touchable*> components accept hitSlop prop which extends the touch area ' +
       'without changing the view bounds.': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TouchableHitSlop />;
     },
   },
   {
     title: 'Touchable Native Methods',
     description: ('Some <Touchable*> components expose native methods like `measure`.': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TouchableNativeMethods />;
     },
   },
@@ -650,14 +650,14 @@ exports.examples = [
     title: 'Disabled Touchable*',
     description: ('<Touchable*> components accept disabled prop which prevents ' +
       'any interaction with component': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <TouchableDisabled />;
     },
   },
   {
     title: 'Custom Ripple Radius (Android-only)',
     description: ('Ripple radius on TouchableNativeFeedback can be controlled': string),
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <CustomRippleRadius />;
     },
   },
diff --git a/RNTester/js/examples/TurboModule/SampleTurboModuleExample.js b/RNTester/js/examples/TurboModule/SampleTurboModuleExample.js
index 8d13df63c26..5002eb26962 100644
--- a/RNTester/js/examples/TurboModule/SampleTurboModuleExample.js
+++ b/RNTester/js/examples/TurboModule/SampleTurboModuleExample.js
@@ -40,17 +40,17 @@ class SampleTurboModuleExample extends React.Component<{||}, State> {
   // Add calls to methods in TurboModule here
   _tests = {
     callback: () =>
-      NativeSampleTurboModule.getValueWithCallback(callbackValue =>
+      NativeSampleTurboModule.getValueWithCallback((callbackValue) =>
         this._setResult('callback', callbackValue),
       ),
     promise: () =>
-      NativeSampleTurboModule.getValueWithPromise(false).then(valuePromise =>
+      NativeSampleTurboModule.getValueWithPromise(false).then((valuePromise) =>
         this._setResult('promise', valuePromise),
       ),
     rejectPromise: () =>
       NativeSampleTurboModule.getValueWithPromise(true)
         .then(() => {})
-        .catch(e => this._setResult('rejectPromise', e.message)),
+        .catch((e) => this._setResult('rejectPromise', e.message)),
     getConstants: () => NativeSampleTurboModule.getConstants(),
     voidFunc: () => NativeSampleTurboModule.voidFunc(),
     getBool: () => NativeSampleTurboModule.getBool(true),
@@ -101,7 +101,7 @@ class SampleTurboModuleExample extends React.Component<{||}, State> {
     }
     if (Platform.OS === 'ios') {
       // iOS is fully implemented, so show all results immediately.
-      Object.keys(this._tests).forEach(item =>
+      Object.keys(this._tests).forEach((item) =>
         this._setResult(item, this._tests[item]()),
       );
     }
@@ -114,7 +114,7 @@ class SampleTurboModuleExample extends React.Component<{||}, State> {
           <TouchableOpacity
             style={[styles.column, styles.button]}
             onPress={() =>
-              Object.keys(this._tests).forEach(item =>
+              Object.keys(this._tests).forEach((item) =>
                 this._setResult(item, this._tests[item]()),
               )
             }>
@@ -128,12 +128,12 @@ class SampleTurboModuleExample extends React.Component<{||}, State> {
         </View>
         <FlatList
           data={Object.keys(this._tests)}
-          keyExtractor={item => item}
+          keyExtractor={(item) => item}
           renderItem={({item}) => (
             <View style={styles.item}>
               <TouchableOpacity
                 style={[styles.column, styles.button]}
-                onPress={e => this._setResult(item, this._tests[item]())}>
+                onPress={(e) => this._setResult(item, this._tests[item]())}>
                 <Text style={styles.buttonText}>{item}</Text>
               </TouchableOpacity>
               <View style={[styles.column]}>{this._renderResult(item)}</View>
diff --git a/RNTester/js/examples/TurboModule/TurboModuleExample.js b/RNTester/js/examples/TurboModule/TurboModuleExample.js
index a22d3c70354..d06f2b6451b 100644
--- a/RNTester/js/examples/TurboModule/TurboModuleExample.js
+++ b/RNTester/js/examples/TurboModule/TurboModuleExample.js
@@ -19,7 +19,7 @@ exports.description = 'Usage of TurboModule';
 exports.examples = [
   {
     title: 'SampleTurboModule',
-    render: function(): React.Element<any> {
+    render: function (): React.Element<any> {
       return <SampleTurboModuleExample />;
     },
   },
diff --git a/RNTester/js/examples/View/ViewExample.js b/RNTester/js/examples/View/ViewExample.js
index 06b27412120..24fecf5f082 100644
--- a/RNTester/js/examples/View/ViewExample.js
+++ b/RNTester/js/examples/View/ViewExample.js
@@ -402,7 +402,7 @@ exports.examples = [
   },
   {
     title: 'BackfaceVisibility',
-    render: function(): React.Node {
+    render: function (): React.Node {
       return (
         <>
           <Text style={{paddingBottom: 10}}>
diff --git a/RNTester/js/examples/WebSocket/WebSocketExample.js b/RNTester/js/examples/WebSocket/WebSocketExample.js
index 169678443df..a057d4b6bf9 100644
--- a/RNTester/js/examples/WebSocket/WebSocketExample.js
+++ b/RNTester/js/examples/WebSocket/WebSocketExample.js
@@ -67,7 +67,7 @@ class WebSocketImage extends React.Component {
   componentDidMount() {
     let ws = (this.ws = new WebSocket(this.props.url));
     ws.binaryType = 'blob';
-    ws.onmessage = event => {
+    ws.onmessage = (event) => {
       if (event.data instanceof Blob) {
         const blob = event.data;
         if (this.state.blob) {
@@ -76,7 +76,7 @@ class WebSocketImage extends React.Component {
         this.setState({blob});
       }
     };
-    ws.onopen = event => {
+    ws.onopen = (event) => {
       ws.send('getImage');
     };
   }
@@ -138,7 +138,7 @@ class WebSocketExample extends React.Component<any, any, State> {
 
   _connect = () => {
     const socket = new WebSocket(this.state.url);
-    WS_EVENTS.forEach(ev => socket.addEventListener(ev, this._onSocketEvent));
+    WS_EVENTS.forEach((ev) => socket.addEventListener(ev, this._onSocketEvent));
     this.setState({
       socket,
       socketState: socket.readyState,
@@ -175,7 +175,7 @@ class WebSocketExample extends React.Component<any, any, State> {
     this.setState({
       fetchStatus: 'fetching',
     });
-    fetch(this.state.httpUrl).then(response => {
+    fetch(this.state.httpUrl).then((response) => {
       if (response.status >= 200 && response.status < 400) {
         this.setState({
           fetchStatus: 'OK',
@@ -230,7 +230,7 @@ class WebSocketExample extends React.Component<any, any, State> {
           style={styles.textInput}
           autoCorrect={false}
           placeholder="Server URL..."
-          onChangeText={url => this.setState({url})}
+          onChangeText={(url) => this.setState({url})}
           value={this.state.url}
         />
         <View style={styles.buttonRow}>
@@ -249,7 +249,7 @@ class WebSocketExample extends React.Component<any, any, State> {
           style={styles.textInput}
           autoCorrect={false}
           placeholder="Type message here..."
-          onChangeText={outgoingMessage => this.setState({outgoingMessage})}
+          onChangeText={(outgoingMessage) => this.setState({outgoingMessage})}
           value={this.state.outgoingMessage}
         />
         <View style={styles.buttonRow}>
@@ -274,7 +274,7 @@ class WebSocketExample extends React.Component<any, any, State> {
           style={styles.textInput}
           autoCorrect={false}
           placeholder="HTTP URL..."
-          onChangeText={httpUrl => this.setState({httpUrl})}
+          onChangeText={(httpUrl) => this.setState({httpUrl})}
           value={this.state.httpUrl}
         />
         <View style={styles.buttonRow}>
diff --git a/RNTester/js/examples/XHR/XHRExampleAbortController.js b/RNTester/js/examples/XHR/XHRExampleAbortController.js
index 8d205d7024e..620f5fb4799 100644
--- a/RNTester/js/examples/XHR/XHRExampleAbortController.js
+++ b/RNTester/js/examples/XHR/XHRExampleAbortController.js
@@ -23,9 +23,9 @@ class XHRExampleAbortController extends React.Component<{...}, {...}> {
     fetch('https://reactnative.dev/', {
       signal: abortController.signal,
     })
-      .then(res => res.text())
-      .then(res => Alert.alert(res))
-      .catch(err => Alert.alert(err.message));
+      .then((res) => res.text())
+      .then((res) => Alert.alert(res))
+      .catch((err) => Alert.alert(err.message));
     this._timeout = setTimeout(() => {
       abortController.abort();
     }, abortDelay);
diff --git a/RNTester/js/examples/XHR/XHRExampleBinaryUpload.js b/RNTester/js/examples/XHR/XHRExampleBinaryUpload.js
index 9dfbe61da5d..2514db44173 100644
--- a/RNTester/js/examples/XHR/XHRExampleBinaryUpload.js
+++ b/RNTester/js/examples/XHR/XHRExampleBinaryUpload.js
@@ -111,8 +111,8 @@ class XHRExampleBinaryUpload extends React.Component<{...}, $FlowFixMeState> {
         <Text>Upload 255 bytes as...</Text>
         <Picker
           selectedValue={this.state.type}
-          onValueChange={type => this.setState({type})}>
-          {Object.keys(BINARY_TYPES).map(type => (
+          onValueChange={(type) => this.setState({type})}>
+          {Object.keys(BINARY_TYPES).map((type) => (
             <Picker.Item key={type} label={type} value={type} />
           ))}
         </Picker>
diff --git a/RNTester/js/examples/XHR/XHRExampleDownload.js b/RNTester/js/examples/XHR/XHRExampleDownload.js
index 41c414c108c..9ac306e160b 100644
--- a/RNTester/js/examples/XHR/XHRExampleDownload.js
+++ b/RNTester/js/examples/XHR/XHRExampleDownload.js
@@ -89,7 +89,7 @@ class XHRExampleDownload extends React.Component<{...}, Object> {
         });
       }
     };
-    const onprogress = event => {
+    const onprogress = (event) => {
       this.setState({
         progressTotal: event.total,
         progressLoaded: event.loaded,
@@ -112,13 +112,9 @@ class XHRExampleDownload extends React.Component<{...}, Object> {
         return;
       }
       if (xhr.status === 200) {
-        let responseType = `Response is a string, ${
-          xhr.response.length
-        } characters long.`;
+        let responseType = `Response is a string, ${xhr.response.length} characters long.`;
         if (xhr.response instanceof ArrayBuffer) {
-          responseType = `Response is an ArrayBuffer, ${
-            xhr.response.byteLength
-          } bytes long.`;
+          responseType = `Response is an ArrayBuffer, ${xhr.response.byteLength} bytes long.`;
         }
         Alert.alert('Download complete!', responseType);
       } else if (xhr.status !== 0) {
@@ -191,7 +187,7 @@ class XHRExampleDownload extends React.Component<{...}, Object> {
           <Text>onreadystatechange handler</Text>
           <Switch
             value={this.state.readystateHandler}
-            onValueChange={readystateHandler =>
+            onValueChange={(readystateHandler) =>
               this.setState({readystateHandler})
             }
           />
@@ -200,14 +196,16 @@ class XHRExampleDownload extends React.Component<{...}, Object> {
           <Text>onprogress handler</Text>
           <Switch
             value={this.state.progressHandler}
-            onValueChange={progressHandler => this.setState({progressHandler})}
+            onValueChange={(progressHandler) =>
+              this.setState({progressHandler})
+            }
           />
         </View>
         <View style={styles.configRow}>
           <Text>download as arraybuffer</Text>
           <Switch
             value={this.state.arraybuffer}
-            onValueChange={arraybuffer => this.setState({arraybuffer})}
+            onValueChange={(arraybuffer) => this.setState({arraybuffer})}
           />
         </View>
         {button}
diff --git a/RNTester/js/examples/XHR/XHRExampleFetch.js b/RNTester/js/examples/XHR/XHRExampleFetch.js
index c9f4aa6bcaf..5fc41bc483e 100644
--- a/RNTester/js/examples/XHR/XHRExampleFetch.js
+++ b/RNTester/js/examples/XHR/XHRExampleFetch.js
@@ -29,12 +29,12 @@ class XHRExampleFetch extends React.Component<any, any> {
 
   submit(uri: string) {
     fetch(uri)
-      .then(response => {
+      .then((response) => {
         this.responseURL = response.url;
         this.responseHeaders = response.headers;
         return response.text();
       })
-      .then(body => {
+      .then((body) => {
         this.setState({responseText: body});
       });
   }
@@ -91,7 +91,7 @@ class XHRExampleFetch extends React.Component<any, any> {
         <TextInput
           returnKeyType="go"
           defaultValue="http://www.posttestserver.com/post.php"
-          onSubmitEditing={event => {
+          onSubmitEditing={(event) => {
             this.submit(event.nativeEvent.text);
           }}
           style={styles.textInput}
diff --git a/RNTester/js/utils/RNTesterList.android.js b/RNTester/js/utils/RNTesterList.android.js
index 1de9d42a00c..5accc800bbf 100644
--- a/RNTester/js/utils/RNTesterList.android.js
+++ b/RNTester/js/utils/RNTesterList.android.js
@@ -244,7 +244,7 @@ const APIExamples: Array<RNTesterExample> = [
 
 const Modules: any = {};
 
-APIExamples.concat(ComponentExamples).forEach(Example => {
+APIExamples.concat(ComponentExamples).forEach((Example) => {
   Modules[Example.key] = Example.module;
 });
 
diff --git a/RNTester/js/utils/RNTesterList.ios.js b/RNTester/js/utils/RNTesterList.ios.js
index a3e6e4f71d1..60d44bb9557 100644
--- a/RNTester/js/utils/RNTesterList.ios.js
+++ b/RNTester/js/utils/RNTesterList.ios.js
@@ -353,7 +353,7 @@ const APIExamples: Array<RNTesterExample> = [
 
 const Modules: {...} = {};
 
-APIExamples.concat(ComponentExamples).forEach(Example => {
+APIExamples.concat(ComponentExamples).forEach((Example) => {
   Modules[Example.key] = Example.module;
 });
 
diff --git a/RNTester/js/utils/RNTesterStatePersister.js b/RNTester/js/utils/RNTesterStatePersister.js
index 20845267130..2dc4a45c096 100644
--- a/RNTester/js/utils/RNTesterStatePersister.js
+++ b/RNTester/js/utils/RNTesterStatePersister.js
@@ -45,8 +45,9 @@ function createContainer<Props: Object, State>(
     /* $FlowFixMe(>=0.53.0 site=react_native_fb,react_native_oss) This comment
      * suppresses an error when upgrading Flow's support for React. To see the
      * error delete this comment and run Flow. */
-    static displayName = `RNTesterStatePersister(${Component.displayName ||
-      Component.name})`;
+    static displayName = `RNTesterStatePersister(${
+      Component.displayName || Component.name
+    })`;
     state = {value: spec.getInitialState(this.props)};
     _cacheKey = `RNTester:${spec.version || 'v1'}:${spec.cacheKeySuffix(
       this.props,
@@ -59,7 +60,7 @@ function createContainer<Props: Object, State>(
       });
     }
     _passSetState = (stateLamda: (state: State) => State): void => {
-      this.setState(state => {
+      this.setState((state) => {
         const value = stateLamda(state.value);
         AsyncStorage.setItem(this._cacheKey, JSON.stringify(value));
         return {value};
diff --git a/ReactAndroid/src/androidTest/js/Asserts.js b/ReactAndroid/src/androidTest/js/Asserts.js
index 2c9710fbd93..ea6eca6248f 100644
--- a/ReactAndroid/src/androidTest/js/Asserts.js
+++ b/ReactAndroid/src/androidTest/js/Asserts.js
@@ -14,7 +14,7 @@ const {NativeModules} = require('react-native');
 const {Assert} = NativeModules;
 
 const Asserts = {
-  assertEquals: function(expected, actual, msg) {
+  assertEquals: function (expected, actual, msg) {
     if (expected !== actual) {
       Assert.fail(
         msg ||
@@ -30,7 +30,7 @@ const Asserts = {
       Assert.success();
     }
   },
-  assertTrue: function(expr, msg) {
+  assertTrue: function (expr, msg) {
     Asserts.assertEquals(true, expr, msg);
   },
 };
diff --git a/ReactAndroid/src/androidTest/js/CatalystRootViewTestModule.js b/ReactAndroid/src/androidTest/js/CatalystRootViewTestModule.js
index dd02631da37..c2adb598214 100644
--- a/ReactAndroid/src/androidTest/js/CatalystRootViewTestModule.js
+++ b/ReactAndroid/src/androidTest/js/CatalystRootViewTestModule.js
@@ -41,7 +41,7 @@ class CatalystRootViewTestApp extends React.Component {
 }
 
 const ReactRootViewTestModule = {
-  setHeight: function(height) {
+  setHeight: function (height) {
     that.setState({height: height});
   },
 };
diff --git a/ReactAndroid/src/androidTest/js/DatePickerDialogTestModule.js b/ReactAndroid/src/androidTest/js/DatePickerDialogTestModule.js
index 5c23e61a5ec..9772b90af06 100644
--- a/ReactAndroid/src/androidTest/js/DatePickerDialogTestModule.js
+++ b/ReactAndroid/src/androidTest/js/DatePickerDialogTestModule.js
@@ -23,7 +23,7 @@ class DatePickerDialogTestApp extends React.Component {
 
 const DatePickerDialogTestModule = {
   DatePickerDialogTestApp: DatePickerDialogTestApp,
-  showDatePickerDialog: function(options) {
+  showDatePickerDialog: function (options) {
     DatePickerAndroid.open(options).then(
       ({action, year, month, day}) => {
         if (action === DatePickerAndroid.dateSetAction) {
diff --git a/ReactAndroid/src/androidTest/js/ImageErrorTestApp.js b/ReactAndroid/src/androidTest/js/ImageErrorTestApp.js
index aa651176477..89a9cd367fb 100644
--- a/ReactAndroid/src/androidTest/js/ImageErrorTestApp.js
+++ b/ReactAndroid/src/androidTest/js/ImageErrorTestApp.js
@@ -15,7 +15,7 @@ const {Image, NativeModules, StyleSheet, View} = require('react-native');
 const {Recording: RecordingModule} = NativeModules;
 
 class ImageErrorTestApp extends React.Component {
-  onError = e => {
+  onError = (e) => {
     RecordingModule.record('Got error: ' + e.nativeEvent.error);
   };
 
diff --git a/ReactAndroid/src/androidTest/js/LayoutEventsTestApp.js b/ReactAndroid/src/androidTest/js/LayoutEventsTestApp.js
index 18dd7c39f0c..d6656ab758c 100644
--- a/ReactAndroid/src/androidTest/js/LayoutEventsTestApp.js
+++ b/ReactAndroid/src/androidTest/js/LayoutEventsTestApp.js
@@ -30,7 +30,7 @@ class LayoutEventsTestApp extends React.Component {
     this.numParentLayouts = 0;
   }
 
-  handleOnLayout = e => {
+  handleOnLayout = (e) => {
     const layout = e.nativeEvent.layout;
     RecordingModule.record(
       layout.x + ',' + layout.y + '-' + layout.width + 'x' + layout.height,
@@ -46,7 +46,7 @@ class LayoutEventsTestApp extends React.Component {
     }
   };
 
-  handleParentOnLayout = e => {
+  handleParentOnLayout = (e) => {
     if (this.numParentLayouts > 0) {
       // This will cause the test to fail - the parent's layout doesn't change
       // so we should only get the event once.
diff --git a/ReactAndroid/src/androidTest/js/MeasureLayoutTestModule.js b/ReactAndroid/src/androidTest/js/MeasureLayoutTestModule.js
index dfca8095e2a..a576c049729 100644
--- a/ReactAndroid/src/androidTest/js/MeasureLayoutTestModule.js
+++ b/ReactAndroid/src/androidTest/js/MeasureLayoutTestModule.js
@@ -71,24 +71,24 @@ function shouldNotCallThisCallback() {
 
 const MeasureLayoutTestModule = {
   MeasureLayoutTestApp: MeasureLayoutTestApp,
-  verifyMeasureOnViewA: function() {
-    UIManager.measure(A, function(a, b, width, height, x, y) {
+  verifyMeasureOnViewA: function () {
+    UIManager.measure(A, function (a, b, width, height, x, y) {
       assertEquals(500, width);
       assertEquals(500, height);
       assertEquals(0, x);
       assertEquals(0, y);
     });
   },
-  verifyMeasureOnViewC: function() {
-    UIManager.measure(C, function(a, b, width, height, x, y) {
+  verifyMeasureOnViewC: function () {
+    UIManager.measure(C, function (a, b, width, height, x, y) {
       assertEquals(50, width);
       assertEquals(150, height);
       assertEquals(150, x);
       assertEquals(150, y);
     });
   },
-  verifyMeasureLayoutCRelativeToA: function() {
-    UIManager.measureLayout(C, A, shouldNotCallThisCallback, function(
+  verifyMeasureLayoutCRelativeToA: function () {
+    UIManager.measureLayout(C, A, shouldNotCallThisCallback, function (
       x,
       y,
       width,
@@ -100,8 +100,8 @@ const MeasureLayoutTestModule = {
       assertEquals(150, y);
     });
   },
-  verifyMeasureLayoutCRelativeToB: function() {
-    UIManager.measureLayout(C, B, shouldNotCallThisCallback, function(
+  verifyMeasureLayoutCRelativeToB: function () {
+    UIManager.measureLayout(C, B, shouldNotCallThisCallback, function (
       x,
       y,
       width,
@@ -113,8 +113,8 @@ const MeasureLayoutTestModule = {
       assertEquals(70, y);
     });
   },
-  verifyMeasureLayoutCRelativeToSelf: function() {
-    UIManager.measureLayout(C, C, shouldNotCallThisCallback, function(
+  verifyMeasureLayoutCRelativeToSelf: function () {
+    UIManager.measureLayout(C, C, shouldNotCallThisCallback, function (
       x,
       y,
       width,
@@ -126,11 +126,11 @@ const MeasureLayoutTestModule = {
       assertEquals(0, y);
     });
   },
-  verifyMeasureLayoutRelativeToParentOnViewA: function() {
+  verifyMeasureLayoutRelativeToParentOnViewA: function () {
     UIManager.measureLayoutRelativeToParent(
       A,
       shouldNotCallThisCallback,
-      function(x, y, width, height) {
+      function (x, y, width, height) {
         assertEquals(500, width);
         assertEquals(500, height);
         assertEquals(0, x);
@@ -138,11 +138,11 @@ const MeasureLayoutTestModule = {
       },
     );
   },
-  verifyMeasureLayoutRelativeToParentOnViewB: function() {
+  verifyMeasureLayoutRelativeToParentOnViewB: function () {
     UIManager.measureLayoutRelativeToParent(
       B,
       shouldNotCallThisCallback,
-      function(x, y, width, height) {
+      function (x, y, width, height) {
         assertEquals(200, width);
         assertEquals(300, height);
         assertEquals(50, x);
@@ -150,11 +150,11 @@ const MeasureLayoutTestModule = {
       },
     );
   },
-  verifyMeasureLayoutRelativeToParentOnViewC: function() {
+  verifyMeasureLayoutRelativeToParentOnViewC: function () {
     UIManager.measureLayoutRelativeToParent(
       C,
       shouldNotCallThisCallback,
-      function(x, y, width, height) {
+      function (x, y, width, height) {
         assertEquals(50, width);
         assertEquals(150, height);
         assertEquals(100, x);
@@ -162,40 +162,40 @@ const MeasureLayoutTestModule = {
       },
     );
   },
-  verifyMeasureLayoutDRelativeToB: function() {
+  verifyMeasureLayoutDRelativeToB: function () {
     UIManager.measureLayout(
       D,
       B,
-      function() {
+      function () {
         assertEquals(true, true);
       },
       shouldNotCallThisCallback,
     );
   },
-  verifyMeasureLayoutNonExistentTag: function() {
+  verifyMeasureLayoutNonExistentTag: function () {
     UIManager.measureLayout(
       192,
       A,
-      function() {
+      function () {
         assertEquals(true, true);
       },
       shouldNotCallThisCallback,
     );
   },
-  verifyMeasureLayoutNonExistentAncestor: function() {
+  verifyMeasureLayoutNonExistentAncestor: function () {
     UIManager.measureLayout(
       B,
       192,
-      function() {
+      function () {
         assertEquals(true, true);
       },
       shouldNotCallThisCallback,
     );
   },
-  verifyMeasureLayoutRelativeToParentNonExistentTag: function() {
+  verifyMeasureLayoutRelativeToParentNonExistentTag: function () {
     UIManager.measureLayoutRelativeToParent(
       192,
-      function() {
+      function () {
         assertEquals(true, true);
       },
       shouldNotCallThisCallback,
diff --git a/ReactAndroid/src/androidTest/js/MultitouchHandlingTestAppModule.js b/ReactAndroid/src/androidTest/js/MultitouchHandlingTestAppModule.js
index a90a58b42d2..6c9d3169504 100644
--- a/ReactAndroid/src/androidTest/js/MultitouchHandlingTestAppModule.js
+++ b/ReactAndroid/src/androidTest/js/MultitouchHandlingTestAppModule.js
@@ -14,7 +14,7 @@ const {NativeModules, StyleSheet, View} = require('react-native');
 
 const {Recording} = NativeModules;
 
-const extractSingleTouch = nativeEvent => {
+const extractSingleTouch = (nativeEvent) => {
   const touches = nativeEvent.touches;
   const changedTouches = nativeEvent.changedTouches;
   const hasTouches = touches && touches.length > 0;
@@ -28,16 +28,16 @@ const extractSingleTouch = nativeEvent => {
 };
 
 class TouchTestApp extends React.Component {
-  handleStartShouldSetResponder = e => {
+  handleStartShouldSetResponder = (e) => {
     return true;
   };
 
-  handleOnResponderMove = e => {
+  handleOnResponderMove = (e) => {
     e = extractSingleTouch(e.nativeEvent);
     Recording.record('move;' + e.touches.length);
   };
 
-  handleResponderStart = e => {
+  handleResponderStart = (e) => {
     e = extractSingleTouch(e.nativeEvent);
     if (e.touches) {
       Recording.record('start;' + e.touches.length);
@@ -46,7 +46,7 @@ class TouchTestApp extends React.Component {
     }
   };
 
-  handleResponderEnd = e => {
+  handleResponderEnd = (e) => {
     e = extractSingleTouch(e.nativeEvent);
     if (e.touches) {
       Recording.record('end;' + e.touches.length);
diff --git a/ReactAndroid/src/androidTest/js/PickerAndroidTestModule.js b/ReactAndroid/src/androidTest/js/PickerAndroidTestModule.js
index a4e0cc0ae67..a9c49fcc7fc 100644
--- a/ReactAndroid/src/androidTest/js/PickerAndroidTestModule.js
+++ b/ReactAndroid/src/androidTest/js/PickerAndroidTestModule.js
@@ -62,7 +62,7 @@ class PickerAndroidTestApp extends React.Component {
     );
   }
 
-  onValueChange = value => {
+  onValueChange = (value) => {
     this.setState({selected: value});
     RecordingModule.recordSelection(value);
   };
@@ -70,13 +70,13 @@ class PickerAndroidTestApp extends React.Component {
 
 const PickerAndroidTestModule = {
   PickerAndroidTestApp: PickerAndroidTestApp,
-  selectItem: function(value) {
+  selectItem: function (value) {
     appInstance.setState({selected: value});
   },
-  setMode: function(mode) {
+  setMode: function (mode) {
     appInstance.setState({mode: mode});
   },
-  setPrimaryColor: function(color) {
+  setPrimaryColor: function (color) {
     appInstance.setState({style: {color}});
   },
 };
diff --git a/ReactAndroid/src/androidTest/js/ProgressBarTestModule.js b/ReactAndroid/src/androidTest/js/ProgressBarTestModule.js
index 655c747ee7c..42d85a20541 100644
--- a/ReactAndroid/src/androidTest/js/ProgressBarTestModule.js
+++ b/ReactAndroid/src/androidTest/js/ProgressBarTestModule.js
@@ -40,7 +40,7 @@ class ProgressBarSampleApp extends React.Component {
 }
 
 const ProgressBarTestModule = {
-  renderProgressBarApplication: function(rootTag) {
+  renderProgressBarApplication: function (rootTag) {
     renderApplication(ProgressBarSampleApp, {}, rootTag);
   },
 };
diff --git a/ReactAndroid/src/androidTest/js/ScrollViewTestModule.js b/ReactAndroid/src/androidTest/js/ScrollViewTestModule.js
index 3a6a887919b..681d6e87b1f 100644
--- a/ReactAndroid/src/androidTest/js/ScrollViewTestModule.js
+++ b/ReactAndroid/src/androidTest/js/ScrollViewTestModule.js
@@ -51,7 +51,7 @@ class Item extends React.Component<ItemProps, ItemState> {
   }
 }
 
-const getInitialState = function() {
+const getInitialState = function () {
   const data = [];
   for (let i = 0; i < NUM_ITEMS; i++) {
     data[i] = {text: 'Item ' + i + '!'};
@@ -61,28 +61,28 @@ const getInitialState = function() {
   };
 };
 
-const onScroll = function(e) {
+const onScroll = function (e) {
   ScrollListener.onScroll(
     e.nativeEvent.contentOffset.x,
     e.nativeEvent.contentOffset.y,
   );
 };
 
-const onScrollBeginDrag = function(e) {
+const onScrollBeginDrag = function (e) {
   ScrollListener.onScrollBeginDrag(
     e.nativeEvent.contentOffset.x,
     e.nativeEvent.contentOffset.y,
   );
 };
 
-const onScrollEndDrag = function(e) {
+const onScrollEndDrag = function (e) {
   ScrollListener.onScrollEndDrag(
     e.nativeEvent.contentOffset.x,
     e.nativeEvent.contentOffset.y,
   );
 };
 
-const onItemPress = function(itemNumber) {
+const onItemPress = function (itemNumber) {
   ScrollListener.onItemPress(itemNumber);
 };
 
diff --git a/ReactAndroid/src/androidTest/js/ShareTestModule.js b/ReactAndroid/src/androidTest/js/ShareTestModule.js
index fc80b761a12..b1409298c63 100644
--- a/ReactAndroid/src/androidTest/js/ShareTestModule.js
+++ b/ReactAndroid/src/androidTest/js/ShareTestModule.js
@@ -23,7 +23,7 @@ class ShareTestApp extends React.Component {
 
 const ShareTestModule = {
   ShareTestApp: ShareTestApp,
-  showShareDialog: function(content, options) {
+  showShareDialog: function (content, options) {
     Share.share(content, options).then(
       () => RecordingModule.recordOpened(),
       ({code, message}) => RecordingModule.recordError(),
diff --git a/ReactAndroid/src/androidTest/js/SubviewsClippingTestModule.js b/ReactAndroid/src/androidTest/js/SubviewsClippingTestModule.js
index ee2367f8b7c..d5e04a8bf90 100644
--- a/ReactAndroid/src/androidTest/js/SubviewsClippingTestModule.js
+++ b/ReactAndroid/src/androidTest/js/SubviewsClippingTestModule.js
@@ -330,7 +330,7 @@ class SubviewsClippingTestApp extends React.Component {
     appInstance = this;
   }
 
-  setComponent = component => {
+  setComponent = (component) => {
     this.setState({component: component});
   };
 
@@ -342,21 +342,21 @@ class SubviewsClippingTestApp extends React.Component {
 
 const SubviewsClippingTestModule = {
   App: SubviewsClippingTestApp,
-  renderClippingSample1: function() {
+  renderClippingSample1: function () {
     appInstance.setComponent(<ClippingSample1 />);
   },
-  renderClippingSample2: function() {
+  renderClippingSample2: function () {
     appInstance.setComponent(<ClippingSample2 />);
   },
-  renderUpdatingSample1: function(update1, update2) {
+  renderUpdatingSample1: function (update1, update2) {
     appInstance.setComponent(
       <UpdatingSample1 update1={update1} update2={update2} />,
     );
   },
-  renderUpdatingSample2: function(update) {
+  renderUpdatingSample2: function (update) {
     appInstance.setComponent(<UpdatingSample2 update={update} />);
   },
-  renderScrollViewTest: function() {
+  renderScrollViewTest: function () {
     appInstance.setComponent(<ScrollViewTest />);
   },
 };
diff --git a/ReactAndroid/src/androidTest/js/SwipeRefreshLayoutTestModule.js b/ReactAndroid/src/androidTest/js/SwipeRefreshLayoutTestModule.js
index 2feb21e37e9..14f81bbb3db 100644
--- a/ReactAndroid/src/androidTest/js/SwipeRefreshLayoutTestModule.js
+++ b/ReactAndroid/src/androidTest/js/SwipeRefreshLayoutTestModule.js
@@ -77,7 +77,7 @@ class SwipeRefreshLayoutTestApp extends React.Component {
 
 const SwipeRefreshLayoutTestModule = {
   SwipeRefreshLayoutTestApp,
-  setRows: function(rows) {
+  setRows: function (rows) {
     if (app != null) {
       app.setState({rows});
     }
diff --git a/ReactAndroid/src/androidTest/js/TestJSLocaleModule.js b/ReactAndroid/src/androidTest/js/TestJSLocaleModule.js
index 756846f9761..b15d1646bb0 100644
--- a/ReactAndroid/src/androidTest/js/TestJSLocaleModule.js
+++ b/ReactAndroid/src/androidTest/js/TestJSLocaleModule.js
@@ -15,10 +15,10 @@ const BatchedBridge = require('react-native/Libraries/BatchedBridge/BatchedBridg
 const {Recording} = NativeModules;
 
 const TestJSLocaleModule = {
-  toUpper: function(s) {
+  toUpper: function (s) {
     Recording.record(s.toUpperCase());
   },
-  toLower: function(s) {
+  toLower: function (s) {
     Recording.record(s.toLowerCase());
   },
 };
diff --git a/ReactAndroid/src/androidTest/js/TestJSToJavaParametersModule.js b/ReactAndroid/src/androidTest/js/TestJSToJavaParametersModule.js
index cf602236522..6053ebf57f6 100644
--- a/ReactAndroid/src/androidTest/js/TestJSToJavaParametersModule.js
+++ b/ReactAndroid/src/androidTest/js/TestJSToJavaParametersModule.js
@@ -15,26 +15,26 @@ const BatchedBridge = require('react-native/Libraries/BatchedBridge/BatchedBridg
 const {Recording} = NativeModules;
 
 const TestJSToJavaParametersModule = {
-  returnBasicTypes: function() {
+  returnBasicTypes: function () {
     Recording.receiveBasicTypes('foo', 3.14, true, null);
   },
-  returnBoxedTypes: function() {
+  returnBoxedTypes: function () {
     Recording.receiveBoxedTypes(42, 3.14, true);
   },
-  returnDynamicTypes: function() {
+  returnDynamicTypes: function () {
     Recording.receiveDynamic('foo');
     Recording.receiveDynamic(3.14);
   },
-  returnArrayWithBasicTypes: function() {
+  returnArrayWithBasicTypes: function () {
     Recording.receiveArray(['foo', 3.14, -111, true, null]);
   },
-  returnNestedArray: function() {
+  returnNestedArray: function () {
     Recording.receiveArray(['we', ['have', ['to', ['go', ['deeper']]]]]);
   },
-  returnArrayWithMaps: function() {
+  returnArrayWithMaps: function () {
     Recording.receiveArray([{m1k1: 'm1v1', m1k2: 'm1v2'}, {m2k1: 'm2v1'}]);
   },
-  returnMapWithBasicTypes: function() {
+  returnMapWithBasicTypes: function () {
     Recording.receiveMap({
       stringKey: 'stringValue',
       doubleKey: 3.14,
@@ -43,24 +43,24 @@ const TestJSToJavaParametersModule = {
       nullKey: null,
     });
   },
-  returnNestedMap: function() {
+  returnNestedMap: function () {
     Recording.receiveMap({
       weHaveToGoDeeper: {
         inception: true,
       },
     });
   },
-  returnMapWithArrays: function() {
+  returnMapWithArrays: function () {
     Recording.receiveMap({
       empty: [],
       ints: [43, 44],
       mixed: [77, 'string', ['another', 'array']],
     });
   },
-  returnArrayWithStringDoubleIntMapArrayBooleanNull: function() {
+  returnArrayWithStringDoubleIntMapArrayBooleanNull: function () {
     Recording.receiveArray(['string', 3.14, 555, {}, [], true, null]);
   },
-  returnMapWithStringDoubleIntMapArrayBooleanNull: function() {
+  returnMapWithStringDoubleIntMapArrayBooleanNull: function () {
     Recording.receiveMap({
       string: 'string',
       double: 3,
@@ -71,13 +71,13 @@ const TestJSToJavaParametersModule = {
       null: null,
     });
   },
-  returnArrayWithLargeInts: function() {
+  returnArrayWithLargeInts: function () {
     Recording.receiveArray([2147483648, -5555555555]);
   },
-  returnMapWithLargeInts: function() {
+  returnMapWithLargeInts: function () {
     Recording.receiveMap({first: -2147483649, second: 5551231231});
   },
-  returnMapForMerge1: function() {
+  returnMapForMerge1: function () {
     Recording.receiveMap({
       a: 1,
       b: 41,
@@ -87,7 +87,7 @@ const TestJSToJavaParametersModule = {
       f: null,
     });
   },
-  returnMapForMerge2: function() {
+  returnMapForMerge2: function () {
     Recording.receiveMap({
       a: 'overwrite',
       d: 77,
@@ -96,7 +96,7 @@ const TestJSToJavaParametersModule = {
       newkey: 'newvalue',
     });
   },
-  returnMapWithMultibyteUTF8CharacterString: function() {
+  returnMapWithMultibyteUTF8CharacterString: function () {
     Recording.receiveMap({
       'one-byte': 'a',
       'two-bytes': '\u00A2',
@@ -106,7 +106,7 @@ const TestJSToJavaParametersModule = {
         '\u017C\u00F3\u0142\u0107 g\u0119\u015Bl\u0105 \u6211 \uD83D\uDE0E ja\u017A\u0107',
     });
   },
-  returnArrayWithMultibyteUTF8CharacterString: function() {
+  returnArrayWithMultibyteUTF8CharacterString: function () {
     Recording.receiveArray([
       'a',
       '\u00A2',
diff --git a/ReactAndroid/src/androidTest/js/TestJavaToJSArgumentsModule.js b/ReactAndroid/src/androidTest/js/TestJavaToJSArgumentsModule.js
index 9340844166a..fc30e4bd100 100644
--- a/ReactAndroid/src/androidTest/js/TestJavaToJSArgumentsModule.js
+++ b/ReactAndroid/src/androidTest/js/TestJavaToJSArgumentsModule.js
@@ -29,20 +29,20 @@ function assertStrictStringEquals(a, b) {
 }
 
 const TestJavaToJSArgumentsModule = {
-  receiveBasicTypes: function(str, dbl, bool, null_arg) {
+  receiveBasicTypes: function (str, dbl, bool, null_arg) {
     assertEquals('foo', str);
     assertEquals(3.14, dbl);
     assertEquals(true, bool);
     assertEquals(null, null_arg);
   },
-  receiveArrayWithBasicTypes: function(arr) {
+  receiveArrayWithBasicTypes: function (arr) {
     assertEquals(4, arr.length);
     assertEquals('red panda', arr[0]);
     assertEquals(1.19, arr[1]);
     assertEquals(true, arr[2]);
     assertEquals(null, arr[3]);
   },
-  receiveNestedArray: function(arr) {
+  receiveNestedArray: function (arr) {
     assertEquals(2, arr.length);
     assertEquals('level1', arr[0]);
     const arr2 = arr[1];
@@ -50,7 +50,7 @@ const TestJavaToJSArgumentsModule = {
     const arr3 = arr2[1];
     assertEquals('level3', arr3[0]);
   },
-  receiveArrayWithMaps: function(arr) {
+  receiveArrayWithMaps: function (arr) {
     assertEquals(2, arr.length);
     const m1 = arr[0];
     const m2 = arr[1];
@@ -58,17 +58,17 @@ const TestJavaToJSArgumentsModule = {
     assertEquals('m1v2', m1.m1k2);
     assertEquals('m2v1', m2.m2k1);
   },
-  receiveMapWithBasicTypes: function(map) {
+  receiveMapWithBasicTypes: function (map) {
     assertEquals('stringValue', map.stringKey);
     assertEquals(3.14, map.doubleKey);
     assertEquals(true, map.booleanKey);
     assertEquals(null, map.nullKey);
   },
-  receiveNestedMap: function(map) {
+  receiveNestedMap: function (map) {
     const nestedMap = map.nestedMap;
     assertEquals('foxes', nestedMap.animals);
   },
-  receiveMapWithArrays: function(map) {
+  receiveMapWithArrays: function (map) {
     const a1 = map.array1;
     const a2 = map.array2;
     assertEquals(3, a1.length);
@@ -76,7 +76,7 @@ const TestJavaToJSArgumentsModule = {
     assertEquals(3, a1[0]);
     assertEquals(9, a2[1]);
   },
-  receiveMapAndArrayWithNullValues: function(map, array) {
+  receiveMapAndArrayWithNullValues: function (map, array) {
     assertEquals(null, map.string);
     assertEquals(null, map.array);
     assertEquals(null, map.map);
@@ -85,7 +85,7 @@ const TestJavaToJSArgumentsModule = {
     assertEquals(null, array[1]);
     assertEquals(null, array[2]);
   },
-  receiveMapWithMultibyteUTF8CharacterString: function(map) {
+  receiveMapWithMultibyteUTF8CharacterString: function (map) {
     assertStrictStringEquals('\u00A2', map['two-bytes']);
     assertStrictStringEquals('\u20AC', map['three-bytes']);
     assertStrictStringEquals('\uD83D\uDE1C', map['four-bytes']);
@@ -94,7 +94,7 @@ const TestJavaToJSArgumentsModule = {
       map.mixed,
     );
   },
-  receiveArrayWithMultibyteUTF8CharacterString: function(array) {
+  receiveArrayWithMultibyteUTF8CharacterString: function (array) {
     assertTrue(true);
     assertStrictStringEquals('\u00A2', array[0]);
     assertStrictStringEquals('\u20AC', array[1]);
diff --git a/ReactAndroid/src/androidTest/js/TestJavaToJSReturnValuesModule.js b/ReactAndroid/src/androidTest/js/TestJavaToJSReturnValuesModule.js
index 7cfac525898..d6b00e3000e 100644
--- a/ReactAndroid/src/androidTest/js/TestJavaToJSReturnValuesModule.js
+++ b/ReactAndroid/src/androidTest/js/TestJavaToJSReturnValuesModule.js
@@ -16,13 +16,13 @@ const {assertEquals, assertTrue} = require('./Asserts');
 const {TestModule} = NativeModules;
 
 const TestJavaToJSReturnValuesModule = {
-  callMethod: function(methodName, expectedType, expectedJSON) {
+  callMethod: function (methodName, expectedType, expectedJSON) {
     const result = TestModule[methodName]();
     assertEquals(expectedType, typeof result);
     assertEquals(expectedJSON, JSON.stringify(result));
   },
 
-  triggerException: function() {
+  triggerException: function () {
     try {
       TestModule.triggerException();
     } catch (ex) {
diff --git a/ReactAndroid/src/androidTest/js/TextInputTestModule.js b/ReactAndroid/src/androidTest/js/TextInputTestModule.js
index 606d1ffd24f..d928a2f4d96 100644
--- a/ReactAndroid/src/androidTest/js/TextInputTestModule.js
+++ b/ReactAndroid/src/androidTest/js/TextInputTestModule.js
@@ -55,7 +55,7 @@ class TokenizedTextExample extends React.Component {
     parts.push(_text);
 
     //highlight hashtags
-    parts = parts.map(text => {
+    parts = parts.map((text) => {
       if (/^#/.test(text)) {
         return (
           <Text key={text} style={styles.hashtag}>
@@ -74,7 +74,7 @@ class TokenizedTextExample extends React.Component {
           testID="tokenizedInput"
           multiline={true}
           style={styles.multiline}
-          onChangeText={text => {
+          onChangeText={(text) => {
             this.setState({text});
           }}>
           <Text>{parts}</Text>
@@ -89,7 +89,7 @@ class TextInputTestApp extends React.Component {
     app = this;
   }
 
-  handleOnSubmitEditing = record => {
+  handleOnSubmitEditing = (record) => {
     Recording.record(record);
   };
 
@@ -176,7 +176,7 @@ const styles = StyleSheet.create({
 
 const TextInputTestModule = {
   TextInputTestApp,
-  setValueRef: function(ref, value) {
+  setValueRef: function (ref, value) {
     app.refs[ref].setNativeProps({
       text: value,
     });
diff --git a/ReactAndroid/src/androidTest/js/TouchBubblingTestAppModule.js b/ReactAndroid/src/androidTest/js/TouchBubblingTestAppModule.js
index 769f740a7ec..f9fc6e10fce 100644
--- a/ReactAndroid/src/androidTest/js/TouchBubblingTestAppModule.js
+++ b/ReactAndroid/src/androidTest/js/TouchBubblingTestAppModule.js
@@ -20,7 +20,7 @@ const {
 const {Recording} = NativeModules;
 
 class TouchBubblingTestApp extends React.Component {
-  handlePress = record => {
+  handlePress = (record) => {
     Recording.record(record);
   };
 
diff --git a/ReactAndroid/src/androidTest/js/ViewRenderingTestModule.js b/ReactAndroid/src/androidTest/js/ViewRenderingTestModule.js
index f0806d7e4fe..f004a4e8419 100644
--- a/ReactAndroid/src/androidTest/js/ViewRenderingTestModule.js
+++ b/ReactAndroid/src/androidTest/js/ViewRenderingTestModule.js
@@ -64,19 +64,19 @@ class TransformSampleApp extends React.Component {
 }
 
 const ViewRenderingTestModule = {
-  renderViewApplication: function(rootTag) {
+  renderViewApplication: function (rootTag) {
     renderApplication(ViewSampleApp, {}, rootTag);
   },
-  renderMarginApplication: function(rootTag) {
+  renderMarginApplication: function (rootTag) {
     renderApplication(MarginSampleApp, {}, rootTag);
   },
-  renderBorderApplication: function(rootTag) {
+  renderBorderApplication: function (rootTag) {
     renderApplication(BorderSampleApp, {}, rootTag);
   },
-  renderTransformApplication: function(rootTag) {
+  renderTransformApplication: function (rootTag) {
     renderApplication(TransformSampleApp, {}, rootTag);
   },
-  updateMargins: function() {
+  updateMargins: function () {
     updateMargins();
   },
 };
diff --git a/ReactCommon/hermes/inspector/tools/msggen/src/HeaderWriter.js b/ReactCommon/hermes/inspector/tools/msggen/src/HeaderWriter.js
index d02a6ab6e28..12076731d46 100644
--- a/ReactCommon/hermes/inspector/tools/msggen/src/HeaderWriter.js
+++ b/ReactCommon/hermes/inspector/tools/msggen/src/HeaderWriter.js
@@ -72,7 +72,7 @@ export class HeaderWriter {
     this.stream.write('struct UnknownRequest;\n\n');
 
     const namespaceMap: Map<string, Array<Type | Command | Event>> = new Map();
-    const addToMap = function(type) {
+    const addToMap = function (type) {
       const domain = type.domain;
       let types = namespaceMap.get(domain);
       if (!types) {
diff --git a/ReactCommon/hermes/inspector/tools/msggen/src/Property.js b/ReactCommon/hermes/inspector/tools/msggen/src/Property.js
index ab93dd05bae..074c43d2ee8 100644
--- a/ReactCommon/hermes/inspector/tools/msggen/src/Property.js
+++ b/ReactCommon/hermes/inspector/tools/msggen/src/Property.js
@@ -39,9 +39,9 @@ export class Property {
     elements: Array<any>,
     ignoreExperimental: boolean,
   ): Array<Property> {
-    let props = elements.map(elem => Property.create(domain, elem));
+    let props = elements.map((elem) => Property.create(domain, elem));
     if (ignoreExperimental) {
-      props = props.filter(prop => !prop.experimental);
+      props = props.filter((prop) => !prop.experimental);
     }
     return props;
   }
diff --git a/ReactCommon/hermes/inspector/tools/msggen/src/index.js b/ReactCommon/hermes/inspector/tools/msggen/src/index.js
index 5124485a86d..ef8e8300627 100644
--- a/ReactCommon/hermes/inspector/tools/msggen/src/index.js
+++ b/ReactCommon/hermes/inspector/tools/msggen/src/index.js
@@ -77,7 +77,7 @@ function buildGraph(desc: Descriptor): Graph {
   const commands = desc.commands;
   const events = desc.events;
 
-  const maybeAddPropEdges = function(nodeId: string, props: ?Array<Property>) {
+  const maybeAddPropEdges = function (nodeId: string, props: ?Array<Property>) {
     if (props) {
       for (const prop of props) {
         const refId = prop.getRefDebuggerName();
@@ -169,8 +169,12 @@ function filterReachableFromRoots(
   // Commands and events don't depend on each other, so just emit them in the
   // order we got them from the JSON file.
   const ids = new Set(topoSortedIds);
-  const commands = desc.commands.filter(cmd => ids.has(cmd.getDebuggerName()));
-  const events = desc.events.filter(event => ids.has(event.getDebuggerName()));
+  const commands = desc.commands.filter((cmd) =>
+    ids.has(cmd.getDebuggerName()),
+  );
+  const events = desc.events.filter((event) =>
+    ids.has(event.getDebuggerName()),
+  );
 
   // Sort commands and events so the code is easier to read. Types have to be
   // topologically sorted as explained above.
diff --git a/bots/code-analysis-bot.js b/bots/code-analysis-bot.js
index 55a80a9edec..d6f46c976d3 100644
--- a/bots/code-analysis-bot.js
+++ b/bots/code-analysis-bot.js
@@ -49,35 +49,35 @@ const converterSummary = {
  * is an array of objects of the shape message and line.
  */
 const converters = {
-  raw: function(output, input) {
+  raw: function (output, input) {
     for (let key in input) {
-      input[key].forEach(function(message) {
+      input[key].forEach(function (message) {
         push(output, key, message);
       });
     }
   },
 
-  flow: function(output, input) {
+  flow: function (output, input) {
     if (!input || !input.errors) {
       return;
     }
 
-    input.errors.forEach(function(error) {
+    input.errors.forEach(function (error) {
       push(output, error.message[0].path, {
-        message: error.message.map(message => message.descr).join(' '),
+        message: error.message.map((message) => message.descr).join(' '),
         line: error.message[0].line,
         converter: 'flow',
       });
     });
   },
 
-  eslint: function(output, input) {
+  eslint: function (output, input) {
     if (!input) {
       return;
     }
 
-    input.forEach(function(file) {
-      file.messages.forEach(function(message) {
+    input.forEach(function (file) {
+      file.messages.forEach(function (message) {
         push(output, file.filePath, {
           message: message.ruleId + ': ' + message.message,
           line: message.line,
@@ -87,12 +87,12 @@ const converters = {
     });
   },
 
-  shellcheck: function(output, input) {
+  shellcheck: function (output, input) {
     if (!input) {
       return;
     }
 
-    input.forEach(function(report) {
+    input.forEach(function (report) {
       push(output, report.file, {
         message:
           '**[SC' +
@@ -148,7 +148,7 @@ function getLineMapFromPatch(patchString) {
   let fileLineIndex = 0;
   let lineMap = {};
 
-  patchString.split('\n').forEach(line => {
+  patchString.split('\n').forEach((line) => {
     if (line.match(/^@@/)) {
       fileLineIndex = line.match(/\+([0-9]+)/)[1] - 1;
       return;
@@ -188,7 +188,7 @@ function sendReview(octokit, owner, repo, number, commit_id, body, comments) {
       comments,
     };
 
-    octokit.pullRequests.createReview(opts, function(error, res) {
+    octokit.pullRequests.createReview(opts, function (error, res) {
       if (error) {
         console.error(error);
         return;
@@ -208,7 +208,7 @@ function sendReview(octokit, owner, repo, number, commit_id, body, comments) {
     }
 
     let results = body + '\n';
-    comments.forEach(comment => {
+    comments.forEach((comment) => {
       results +=
         comment.path + ':' + comment.position + ': ' + comment.body + '\n';
     });
@@ -234,19 +234,19 @@ function main(messages, owner, repo, number) {
     auth: process.env.GITHUB_TOKEN,
   });
 
-  getShaFromPullRequest(octokit, owner, repo, number, sha => {
-    getFilesFromPullRequest(octokit, owner, repo, number, files => {
+  getShaFromPullRequest(octokit, owner, repo, number, (sha) => {
+    getFilesFromPullRequest(octokit, owner, repo, number, (files) => {
       let comments = [];
       let convertersUsed = [];
       files
-        .filter(file => messages[file.filename])
-        .forEach(file => {
+        .filter((file) => messages[file.filename])
+        .forEach((file) => {
           // github api sometimes does not return a patch on large commits
           if (!file.patch) {
             return;
           }
           const lineMap = getLineMapFromPatch(file.patch);
-          messages[file.filename].forEach(message => {
+          messages[file.filename].forEach((message) => {
             if (lineMap[message.line]) {
               const comment = {
                 path: file.filename,
@@ -261,7 +261,7 @@ function main(messages, owner, repo, number) {
 
       let body = '**Code analysis results:**\n\n';
       const uniqueconvertersUsed = [...new Set(convertersUsed)];
-      uniqueconvertersUsed.forEach(converter => {
+      uniqueconvertersUsed.forEach((converter) => {
         body += '* ' + converterSummary[converter] + '\n';
       });
 
@@ -272,10 +272,10 @@ function main(messages, owner, repo, number) {
 
 let content = '';
 process.stdin.resume();
-process.stdin.on('data', function(buf) {
+process.stdin.on('data', function (buf) {
   content += buf.toString();
 });
-process.stdin.on('end', function() {
+process.stdin.on('end', function () {
   let messages = {};
 
   // Since we send a few http requests to setup the process, we don't want
diff --git a/bots/datastore.js b/bots/datastore.js
index a6e2c927466..d835899f695 100644
--- a/bots/datastore.js
+++ b/bots/datastore.js
@@ -43,7 +43,7 @@ async function initializeStore(email, password) {
     await app
       .auth()
       .signInWithEmailAndPassword(email, password)
-      .catch(error => console.log(error));
+      .catch((error) => console.log(error));
   }
 
   return app.firestore();
@@ -92,9 +92,9 @@ function createOrUpdateDocument(collection, sha, data) {
     timestamp: firebase.firestore.Timestamp.now(),
   };
   const docRef = collection.doc(sha);
-  return docRef.update(stampedData).catch(async error => {
+  return docRef.update(stampedData).catch(async (error) => {
     if (error.code === 'not-found') {
-      await docRef.set(stampedData).catch(setError => console.log(setError));
+      await docRef.set(stampedData).catch((setError) => console.log(setError));
     } else {
       console.log(error);
     }
@@ -111,7 +111,7 @@ function getLatestDocument(collection) {
     .orderBy('timestamp', 'desc')
     .limit(1)
     .get()
-    .then(snapshot => {
+    .then((snapshot) => {
       if (snapshot.empty) {
         return undefined;
       }
@@ -122,7 +122,7 @@ function getLatestDocument(collection) {
         commit: doc.id,
       };
     })
-    .catch(error => {
+    .catch((error) => {
       console.log(error);
       return undefined;
     });
diff --git a/bots/report-bundle-size.js b/bots/report-bundle-size.js
index a17c303d17c..de988099280 100644
--- a/bots/report-bundle-size.js
+++ b/bots/report-bundle-size.js
@@ -86,7 +86,7 @@ async function reportSizeStats(stats, replacePattern) {
     const comment = [
       '| Platform | Engine | Arch | Size (bytes) | Diff |',
       '|:---------|:-------|:-----|-------------:|-----:|',
-      ...Object.keys(stats).map(identifier => {
+      ...Object.keys(stats).map((identifier) => {
         const [size, diff] = (() => {
           const statSize = stats[identifier];
           if (!statSize) {
diff --git a/flow/jest.js b/flow/jest.js
index 69cc3f50089..ea85490aa75 100644
--- a/flow/jest.js
+++ b/flow/jest.js
@@ -1075,8 +1075,8 @@ type JestPrettyFormatColors = {
   ...
 };
 
-type JestPrettyFormatIndent = string => string;
-type JestPrettyFormatPrint = any => string;
+type JestPrettyFormatIndent = (string) => string;
+type JestPrettyFormatPrint = (any) => string;
 
 type JestPrettyFormatOptions = {|
   callToJSON: boolean,
@@ -1106,7 +1106,7 @@ type JestPrettyFormatPlugin = {
     opts: JestPrettyFormatOptions,
     colors: JestPrettyFormatColors,
   ) => string,
-  test: any => boolean,
+  test: (any) => boolean,
   ...
 };
 
diff --git a/jest/mockComponent.js b/jest/mockComponent.js
index 28e22212396..11e9e0b058d 100644
--- a/jest/mockComponent.js
+++ b/jest/mockComponent.js
@@ -30,7 +30,7 @@ module.exports = (moduleName, instanceMethods) => {
       const props = Object.assign({}, RealComponent.defaultProps);
 
       if (this.props) {
-        Object.keys(this.props).forEach(prop => {
+        Object.keys(this.props).forEach((prop) => {
           // We can't just assign props on top of defaultProps
           // because React treats undefined as special and different from null.
           // If a prop is specified but set to undefined it is ignored and the
@@ -50,7 +50,7 @@ module.exports = (moduleName, instanceMethods) => {
     }
   };
 
-  Object.keys(RealComponent).forEach(classStatic => {
+  Object.keys(RealComponent).forEach((classStatic) => {
     Component[classStatic] = RealComponent[classStatic];
   });
 
diff --git a/jest/setup.js b/jest/setup.js
index c38003739d1..fa2e0554670 100644
--- a/jest/setup.js
+++ b/jest/setup.js
@@ -20,10 +20,10 @@ global.__DEV__ = true;
 global.Promise = jest.requireActual('promise');
 global.regeneratorRuntime = jest.requireActual('regenerator-runtime/runtime');
 
-global.requestAnimationFrame = function(callback) {
+global.requestAnimationFrame = function (callback) {
   return setTimeout(callback, 0);
 };
-global.cancelAnimationFrame = function(id) {
+global.cancelAnimationFrame = function (id) {
   clearTimeout(id);
 };
 
@@ -54,7 +54,7 @@ jest
     customDirectEventTypes: {},
     dispatchViewManagerCommand: jest.fn(),
     focus: jest.fn(),
-    getViewManagerConfig: jest.fn(name => {
+    getViewManagerConfig: jest.fn((name) => {
       if (name === 'AndroidDrawerLayout') {
         return {
           Constants: {
@@ -167,8 +167,8 @@ jest
       multiMerge: jest.fn((entries, callback) =>
         process.nextTick(() => callback(null)),
       ),
-      clear: jest.fn(callback => process.nextTick(() => callback(null))),
-      getAllKeys: jest.fn(callback =>
+      clear: jest.fn((callback) => process.nextTick(() => callback(null))),
+      getAllKeys: jest.fn((callback) =>
         process.nextTick(() => callback(null, [])),
       ),
     },
@@ -197,7 +197,7 @@ jest
       },
     },
     ImageLoader: {
-      getSize: jest.fn(url => Promise.resolve({width: 320, height: 240})),
+      getSize: jest.fn((url) => Promise.resolve({width: 320, height: 240})),
       prefetchImage: jest.fn(),
     },
     ImageViewManager: {
@@ -226,23 +226,23 @@ jest
       scheduleLocalNotification: jest.fn(),
       cancelAllLocalNotifications: jest.fn(),
       removeAllDeliveredNotifications: jest.fn(),
-      getDeliveredNotifications: jest.fn(callback =>
+      getDeliveredNotifications: jest.fn((callback) =>
         process.nextTick(() => []),
       ),
       removeDeliveredNotifications: jest.fn(),
       setApplicationIconBadgeNumber: jest.fn(),
-      getApplicationIconBadgeNumber: jest.fn(callback =>
+      getApplicationIconBadgeNumber: jest.fn((callback) =>
         process.nextTick(() => callback(0)),
       ),
       cancelLocalNotifications: jest.fn(),
-      getScheduledLocalNotifications: jest.fn(callback =>
+      getScheduledLocalNotifications: jest.fn((callback) =>
         process.nextTick(() => callback()),
       ),
       requestPermissions: jest.fn(() =>
         Promise.resolve({alert: true, badge: true, sound: true}),
       ),
       abandonPermissions: jest.fn(),
-      checkPermissions: jest.fn(callback =>
+      checkPermissions: jest.fn((callback) =>
         process.nextTick(() =>
           callback({alert: true, badge: true, sound: true}),
         ),
@@ -305,7 +305,7 @@ jest
   .mock('../Libraries/ReactNative/requireNativeComponent', () => {
     const React = require('react');
 
-    return viewName => {
+    return (viewName) => {
       const Component = class extends React.Component {
         render() {
           return React.createElement(viewName, this.props, this.props.children);
@@ -331,7 +331,7 @@ jest
   })
   .mock(
     '../Libraries/Utilities/verifyComponentAttributeEquivalence',
-    () => function() {},
+    () => function () {},
   )
   .mock('../Libraries/Components/View/ViewNativeComponent', () => {
     const React = require('react');
diff --git a/package.json b/package.json
index 5f3a5d9aa03..81e4f313e7a 100644
--- a/package.json
+++ b/package.json
@@ -144,7 +144,7 @@
     "jest-junit": "^6.3.0",
     "jscodeshift": "^0.6.2",
     "mkdirp": "^0.5.1",
-    "prettier": "1.17.0",
+    "prettier": "2.0.2",
     "react": "16.13.0",
     "react-test-renderer": "16.13.0",
     "shelljs": "^0.7.8",
diff --git a/packages/babel-plugin-inline-view-configs/__tests__/index-test.js b/packages/babel-plugin-inline-view-configs/__tests__/index-test.js
index 26c0e09ad06..b289611e6f4 100644
--- a/packages/babel-plugin-inline-view-configs/__tests__/index-test.js
+++ b/packages/babel-plugin-inline-view-configs/__tests__/index-test.js
@@ -25,7 +25,7 @@ function transform(fixture, filename) {
 describe('Babel plugin inline view configs', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       it(`can inline config for ${fixtureName}`, () => {
         expect(transform(fixtures[fixtureName], fixtureName)).toMatchSnapshot();
       });
@@ -33,7 +33,7 @@ describe('Babel plugin inline view configs', () => {
 
   Object.keys(failures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       it(`fails on inline config for ${fixtureName}`, () => {
         expect(() => {
           transform(failures[fixtureName], fixtureName);
diff --git a/packages/babel-plugin-inline-view-configs/index.js b/packages/babel-plugin-inline-view-configs/index.js
index ba58d0600fb..15df824cc65 100644
--- a/packages/babel-plugin-inline-view-configs/index.js
+++ b/packages/babel-plugin-inline-view-configs/index.js
@@ -55,7 +55,7 @@ function isCodegenDeclaration(declaration) {
   return false;
 }
 
-module.exports = function(context) {
+module.exports = function (context) {
   return {
     pre(state) {
       this.code = state.code;
@@ -105,7 +105,7 @@ module.exports = function(context) {
           nodePath.node.specifiers &&
           nodePath.node.specifiers.length > 0
         ) {
-          nodePath.node.specifiers.forEach(specifier => {
+          nodePath.node.specifiers.forEach((specifier) => {
             if (
               specifier.type === 'ExportSpecifier' &&
               specifier.local.type === 'Identifier' &&
diff --git a/packages/eslint-config-react-native-community/package.json b/packages/eslint-config-react-native-community/package.json
index 6f203844676..460d39c3ee1 100644
--- a/packages/eslint-config-react-native-community/package.json
+++ b/packages/eslint-config-react-native-community/package.json
@@ -21,7 +21,7 @@
     "eslint-plugin-react": "7.16.0",
     "eslint-plugin-react-hooks": "^2.0.1",
     "eslint-plugin-react-native": "3.8.1",
-    "prettier": "1.17.0"
+    "prettier": "2.0.2"
   },
   "peerDependencies": {
     "eslint": ">=5"
diff --git a/packages/eslint-config-react-native-community/yarn.lock b/packages/eslint-config-react-native-community/yarn.lock
index 0491f4ef3f5..2add3c99a2c 100644
--- a/packages/eslint-config-react-native-community/yarn.lock
+++ b/packages/eslint-config-react-native-community/yarn.lock
@@ -958,10 +958,10 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
-prettier@1.17.0:
-  version "1.17.0"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.17.0.tgz#53b303676eed22cc14a9f0cec09b477b3026c008"
-  integrity sha512-sXe5lSt2WQlCbydGETgfm1YBShgOX4HxQkFPvbxkcwgDvGDeqVau8h+12+lmSVlP3rHPz0oavfddSZg/q+Szjw==
+prettier@2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.0.2.tgz#1ba8f3eb92231e769b7fcd7cb73ae1b6b74ade08"
+  integrity sha512-5xJQIPT8BraI7ZnaDwSbu5zLrB6vvi8hVV58yHQ+QK64qrY40dULy0HSRlQ2/2IdzeBpjhDkqdcFBnFeDEMVdg==
 
 progress@^2.0.0:
   version "2.0.3"
diff --git a/packages/react-native-codegen/src/SchemaValidator.js b/packages/react-native-codegen/src/SchemaValidator.js
index 4905b9a7fa8..4de74da078b 100644
--- a/packages/react-native-codegen/src/SchemaValidator.js
+++ b/packages/react-native-codegen/src/SchemaValidator.js
@@ -20,14 +20,14 @@ function getErrors(schema: SchemaType): $ReadOnlyArray<string> {
   // Map of component name -> Array of module names
   const componentModules: Map<string, Array<string>> = new Map();
 
-  Object.keys(schema.modules).forEach(moduleName => {
+  Object.keys(schema.modules).forEach((moduleName) => {
     const module = schema.modules[moduleName];
 
     if (module.components == null) {
       return;
     }
 
-    Object.keys(module.components).forEach(componentName => {
+    Object.keys(module.components).forEach((componentName) => {
       if (module.components == null) {
         return;
       }
diff --git a/packages/react-native-codegen/src/__tests__/SchemaValidator-test.js b/packages/react-native-codegen/src/__tests__/SchemaValidator-test.js
index d2c65b18a93..6b9ea6f130b 100644
--- a/packages/react-native-codegen/src/__tests__/SchemaValidator-test.js
+++ b/packages/react-native-codegen/src/__tests__/SchemaValidator-test.js
@@ -68,7 +68,7 @@ describe('SchemaValidator', () => {
   describe('fixture', () => {
     Object.keys(fixtures)
       .sort()
-      .forEach(fixtureName => {
+      .forEach((fixtureName) => {
         const fixture = fixtures[fixtureName];
 
         it(`${fixtureName} has no errors`, () => {
diff --git a/packages/react-native-codegen/src/cli/parser/parser.js b/packages/react-native-codegen/src/cli/parser/parser.js
index a54bd28c4dc..8155f97282c 100644
--- a/packages/react-native-codegen/src/cli/parser/parser.js
+++ b/packages/react-native-codegen/src/cli/parser/parser.js
@@ -13,7 +13,7 @@
 const FlowParser = require('../../parsers/flow');
 
 function parseFiles(files: Array<string>) {
-  files.forEach(filename => {
+  files.forEach((filename) => {
     console.log(
       filename,
       JSON.stringify(FlowParser.parseFile(filename), null, 2),
diff --git a/packages/react-native-codegen/src/cli/verify_with_old_codegen.js b/packages/react-native-codegen/src/cli/verify_with_old_codegen.js
index f46f6f76fa9..aaded99ade8 100755
--- a/packages/react-native-codegen/src/cli/verify_with_old_codegen.js
+++ b/packages/react-native-codegen/src/cli/verify_with_old_codegen.js
@@ -20,10 +20,10 @@ function traverse(t) {
   return t
     .replace(/\).invoke/g, ')\n.invoke') // in old codegen it was in one line
     .split('\n')
-    .map(l => l.trim()) // no whitespaces
+    .map((l) => l.trim()) // no whitespaces
     .filter(Boolean) // no empty lines
     .filter(
-      l =>
+      (l) =>
         !l.startsWith('namespace') && // no namespaces
         !l.startsWith('}') && // after removing openign namespaces we need to remove all closings
         !l.startsWith('/**') && // all comments
@@ -32,7 +32,7 @@ function traverse(t) {
         !l.startsWith('importing it, you must change') && // comment in old codegen
         !l.startsWith('*'), //comments
     )
-    .map(l => l.replace(/ /g, '')) // remove rest whitespaces
+    .map((l) => l.replace(/ /g, '')) // remove rest whitespaces
     .sort(); // sort alphabetically lines
 }
 
@@ -45,9 +45,7 @@ if (t1.length !== t2.length) {
   for (let i = 0; i < t1.length; i++) {
     if (t1[i] !== t2[i]) {
       throw new Error(
-        `Old and new codegen does not produce similar output! ${i}  ${
-          t1[i]
-        } | ${t2[i]}`,
+        `Old and new codegen does not produce similar output! ${i}  ${t1[i]} | ${t2[i]}`,
       );
     }
   }
diff --git a/packages/react-native-codegen/src/generators/components/CppHelpers.js b/packages/react-native-codegen/src/generators/components/CppHelpers.js
index 80854623221..ffe6dfdec0e 100644
--- a/packages/react-native-codegen/src/generators/components/CppHelpers.js
+++ b/packages/react-native-codegen/src/generators/components/CppHelpers.js
@@ -20,10 +20,7 @@ function upperCaseFirst(inString: string): string {
 }
 
 function toSafeCppString(input: string): string {
-  return input
-    .split('-')
-    .map(upperCaseFirst)
-    .join('');
+  return input.split('-').map(upperCaseFirst).join('');
 }
 
 function toIntEnumValueName(propName: string, value: number): string {
@@ -75,7 +72,7 @@ function getImports(properties: $ReadOnlyArray<PropTypeShape>): Set<string> {
     }
   }
 
-  properties.forEach(prop => {
+  properties.forEach((prop) => {
     const typeAnnotation = prop.typeAnnotation;
 
     if (typeAnnotation.type === 'NativePrimitiveTypeAnnotation') {
diff --git a/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js b/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js
index 2bd7a7817d2..9542e95b314 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js
@@ -50,7 +50,7 @@ module.exports = {
     const fileName = 'ComponentDescriptors.h';
 
     const componentDescriptors = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -58,7 +58,7 @@ module.exports = {
         }
 
         return Object.keys(components)
-          .map(componentName => {
+          .map((componentName) => {
             if (components[componentName].interfaceOnly === true) {
               return;
             }
diff --git a/packages/react-native-codegen/src/generators/components/GenerateComponentHObjCpp.js b/packages/react-native-codegen/src/generators/components/GenerateComponentHObjCpp.js
index db66bacc553..6480e5a61e3 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateComponentHObjCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateComponentHObjCpp.js
@@ -185,7 +185,7 @@ function generateProtocol(
   componentName: string,
 ): string {
   const commands = component.commands
-    .map(command => {
+    .map((command) => {
       const params = command.typeAnnotation.params;
       const paramString =
         params.length === 0
@@ -270,7 +270,7 @@ function generateCommandHandler(
   }
 
   const ifCases = component.commands
-    .map(command => generateCommandIfCase(command, componentName))
+    .map((command) => generateCommandIfCase(command, componentName))
     .join('\n\n');
 
   return commandHandlerTemplate
@@ -287,7 +287,7 @@ module.exports = {
     const fileName = 'RCTComponentViewHelpers.h';
 
     const componentContent = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -295,11 +295,11 @@ module.exports = {
         }
 
         return Object.keys(components)
-          .filter(componentName => {
+          .filter((componentName) => {
             const component = components[componentName];
             return component.excludedPlatform !== 'iOS';
           })
-          .map(componentName => {
+          .map((componentName) => {
             return [
               generateProtocol(components[componentName], componentName),
               generateCommandHandler(components[componentName], componentName),
diff --git a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js
index 8577df4309e..8a804cb7b4a 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js
@@ -83,7 +83,7 @@ function generateSetters(
   propertyParts: $ReadOnlyArray<string>,
 ): string {
   const propSetters = properties
-    .map(eventProperty => {
+    .map((eventProperty) => {
       switch (eventProperty.type) {
         case 'BooleanTypeAnnotation':
         case 'StringTypeAnnotation':
@@ -168,7 +168,7 @@ module.exports = {
     moduleSpecName: string,
   ): FilesOutput {
     const moduleComponents: ComponentCollection = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -183,11 +183,11 @@ module.exports = {
     const fileName = 'EventEmitters.cpp';
 
     const componentEmitters = Object.keys(moduleComponents)
-      .map(componentName => {
+      .map((componentName) => {
         const component = moduleComponents[componentName];
 
         return component.events
-          .map(event => {
+          .map((event) => {
             return generateEvent(componentName, event);
           })
           .join('\n');
diff --git a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js
index a1d6956f855..bca5e619296 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js
@@ -126,7 +126,7 @@ function generateEnum(structs, options, nameParts) {
 
   const toCases = options
     .map(
-      option =>
+      (option) =>
         `case ${structName}::${toSafeCppString(option.name)}: return "${
           option.name
         }";`,
@@ -152,7 +152,7 @@ function generateStruct(
   const structName = generateEventStructName(structNameParts);
 
   const fields = properties
-    .map(property => {
+    .map((property) => {
       return `${getNativeTypeFromAnnotation(
         componentName,
         property,
@@ -200,7 +200,7 @@ function generateStruct(
 function generateStructs(componentName: string, component): string {
   const structs: StructsMap = new Map();
 
-  component.events.forEach(event => {
+  component.events.forEach((event) => {
     if (event.typeAnnotation.argument) {
       generateStruct(
         structs,
@@ -225,7 +225,7 @@ function generateEvent(componentName: string, event: EventTypeShape): string {
 }
 function generateEvents(componentName: string, component): string {
   return component.events
-    .map(event => generateEvent(componentName, event))
+    .map((event) => generateEvent(componentName, event))
     .join('\n\n' + '  ');
 }
 
@@ -236,7 +236,7 @@ module.exports = {
     moduleSpecName: string,
   ): FilesOutput {
     const moduleComponents: ComponentCollection = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -249,7 +249,7 @@ module.exports = {
       .reduce((acc, components) => Object.assign(acc, components), {});
 
     const moduleComponentsWithEvents = Object.keys(moduleComponents).filter(
-      componentName => moduleComponents[componentName].events.length > 0,
+      (componentName) => moduleComponents[componentName].events.length > 0,
     );
 
     const fileName = 'EventEmitters.h';
@@ -257,7 +257,7 @@ module.exports = {
     const componentEmitters =
       moduleComponentsWithEvents.length > 0
         ? Object.keys(moduleComponents)
-            .map(componentName => {
+            .map((componentName) => {
               const component = moduleComponents[componentName];
 
               const replacedTemplate = componentTemplate
diff --git a/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js b/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js
index dfa114376a7..cc9136e4857 100644
--- a/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js
@@ -47,11 +47,9 @@ const componentTemplate = `
 
 function generatePropsString(componentName: string, component: ComponentShape) {
   return component.props
-    .map(prop => {
+    .map((prop) => {
       const defaultValue = convertDefaultTypeToString(componentName, prop);
-      return `${prop.name}(convertRawProp(rawProps, "${
-        prop.name
-      }", sourceProps.${prop.name}, {${defaultValue}}))`;
+      return `${prop.name}(convertRawProp(rawProps, "${prop.name}", sourceProps.${prop.name}, {${defaultValue}}))`;
     })
     .join(',\n' + '    ');
 }
@@ -60,7 +58,7 @@ function getClassExtendString(component): string {
   const extendString =
     ' ' +
     component.extendsProps
-      .map(extendProps => {
+      .map((extendProps) => {
         switch (extendProps.type) {
           case 'ReactNativeBuiltInType':
             switch (extendProps.knownTypeName) {
@@ -93,7 +91,7 @@ module.exports = {
     ]);
 
     const componentProps = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -101,11 +99,11 @@ module.exports = {
         }
 
         return Object.keys(components)
-          .filter(componentName => {
+          .filter((componentName) => {
             const component = components[componentName];
             return component.excludedPlatform !== 'iOS';
           })
-          .map(componentName => {
+          .map((componentName) => {
             const component = components[componentName];
             const newName = `${componentName}Props`;
 
@@ -133,10 +131,7 @@ module.exports = {
       .replace(
         '::_IMPORTS_::',
 
-        Array.from(allImports)
-          .sort()
-          .join('\n')
-          .trim(),
+        Array.from(allImports).sort().join('\n').trim(),
       );
 
     return new Map([[fileName, replacedTemplate]]);
diff --git a/packages/react-native-codegen/src/generators/components/GeneratePropsH.js b/packages/react-native-codegen/src/generators/components/GeneratePropsH.js
index 557a7e4d27b..4042d843c20 100644
--- a/packages/react-native-codegen/src/generators/components/GeneratePropsH.js
+++ b/packages/react-native-codegen/src/generators/components/GeneratePropsH.js
@@ -187,7 +187,7 @@ function getClassExtendString(component): string {
   const extendString =
     ' : ' +
     component.extendsProps
-      .map(extendProps => {
+      .map((extendProps) => {
         switch (extendProps.type) {
           case 'ReactNativeBuiltInType':
             switch (extendProps.knownTypeName) {
@@ -275,9 +275,7 @@ function getNativeTypeFromAnnotation(
     default:
       (typeAnnotation: empty);
       throw new Error(
-        `Received invalid typeAnnotation for ${componentName} prop ${
-          prop.name
-        }, received ${typeAnnotation.type}`,
+        `Received invalid typeAnnotation for ${componentName} prop ${prop.name}, received ${typeAnnotation.type}`,
       );
   }
 }
@@ -291,7 +289,7 @@ function generateArrayEnumString(
   name: string,
   enumOptions,
 ): string {
-  const options = enumOptions.map(option => option.name);
+  const options = enumOptions.map((option) => option.name);
   const enumName = getEnumName(componentName, name);
 
   const values = options
@@ -300,7 +298,7 @@ function generateArrayEnumString(
 
   const fromCases = options
     .map(
-      option =>
+      (option) =>
         `if (item == "${option}") {
       result |= ${enumName}::${toSafeCppString(option)};
       continue;
@@ -310,7 +308,7 @@ function generateArrayEnumString(
 
   const toCases = options
     .map(
-      option =>
+      (option) =>
         `if (value & ${enumName}::${toSafeCppString(option)}) {
       result += "${option}" + separator;
     }`,
@@ -329,13 +327,13 @@ function generateStringEnum(componentName, prop) {
   const typeAnnotation = prop.typeAnnotation;
   if (typeAnnotation.type === 'StringEnumTypeAnnotation') {
     const values: $ReadOnlyArray<string> = typeAnnotation.options.map(
-      option => option.name,
+      (option) => option.name,
     );
     const enumName = getEnumName(componentName, prop.name);
 
     const fromCases = values
       .map(
-        value =>
+        (value) =>
           `if (string == "${value}") { result = ${enumName}::${convertValueToEnumOption(
             value,
           )}; return; }`,
@@ -344,7 +342,7 @@ function generateStringEnum(componentName, prop) {
 
     const toCases = values
       .map(
-        value =>
+        (value) =>
           `case ${enumName}::${convertValueToEnumOption(
             value,
           )}: return "${value}";`,
@@ -365,13 +363,13 @@ function generateIntEnum(componentName, prop) {
   const typeAnnotation = prop.typeAnnotation;
   if (typeAnnotation.type === 'Int32EnumTypeAnnotation') {
     const values: $ReadOnlyArray<number> = typeAnnotation.options.map(
-      option => option.value,
+      (option) => option.value,
     );
     const enumName = getEnumName(componentName, prop.name);
 
     const fromCases = values
       .map(
-        value =>
+        (value) =>
           `
     case ${value}:
       result = ${enumName}::${toIntEnumValueName(prop.name, value)};
@@ -381,7 +379,7 @@ function generateIntEnum(componentName, prop) {
 
     const toCases = values
       .map(
-        value =>
+        (value) =>
           `case ${enumName}::${toIntEnumValueName(
             prop.name,
             value,
@@ -390,7 +388,7 @@ function generateIntEnum(componentName, prop) {
       .join('\n' + '    ');
 
     const valueVariables = values
-      .map(val => `${toIntEnumValueName(prop.name, val)} = ${val}`)
+      .map((val) => `${toIntEnumValueName(prop.name, val)} = ${val}`)
       .join(', ');
 
     return intEnumTemplate
@@ -405,7 +403,7 @@ function generateIntEnum(componentName, prop) {
 
 function generateEnumString(componentName: string, component): string {
   return component.props
-    .map(prop => {
+    .map((prop) => {
       if (
         prop.typeAnnotation.type === 'ArrayTypeAnnotation' &&
         prop.typeAnnotation.elementType.type === 'StringEnumTypeAnnotation'
@@ -427,7 +425,7 @@ function generateEnumString(componentName: string, component): string {
 
       if (prop.typeAnnotation.type === 'ObjectTypeAnnotation') {
         return prop.typeAnnotation.properties
-          .map(property => {
+          .map((property) => {
             if (property.typeAnnotation.type === 'StringEnumTypeAnnotation') {
               return generateStringEnum(componentName, property);
             } else if (
@@ -450,7 +448,7 @@ function generatePropsString(
   props: $ReadOnlyArray<PropTypeShape>,
 ) {
   return props
-    .map(prop => {
+    .map((prop) => {
       const nativeType = getNativeTypeFromAnnotation(componentName, prop, []);
       const defaultValue = convertDefaultTypeToString(componentName, prop);
 
@@ -464,7 +462,7 @@ function getExtendsImports(
 ): Set<string> {
   const imports: Set<string> = new Set();
 
-  extendsProps.forEach(extendProps => {
+  extendsProps.forEach((extendProps) => {
     switch (extendProps.type) {
       case 'ReactNativeBuiltInType':
         switch (extendProps.knownTypeName) {
@@ -511,7 +509,7 @@ function getLocalImports(
     }
   }
 
-  properties.forEach(prop => {
+  properties.forEach((prop) => {
     const typeAnnotation = prop.typeAnnotation;
 
     if (typeAnnotation.type === 'NativePrimitiveTypeAnnotation') {
@@ -570,7 +568,7 @@ function generateStructs(
   nameParts,
 ): StructsMap {
   const structs: StructsMap = new Map();
-  properties.forEach(prop => {
+  properties.forEach((prop) => {
     const typeAnnotation = prop.typeAnnotation;
     if (typeAnnotation.type === 'ObjectTypeAnnotation') {
       // Recursively visit all of the object properties.
@@ -581,7 +579,7 @@ function generateStructs(
         elementProperties,
         nameParts.concat([prop.name]),
       );
-      nestedStructs.forEach(function(value, key) {
+      nestedStructs.forEach(function (value, key) {
         structs.set(key, value);
       });
 
@@ -605,7 +603,7 @@ function generateStructs(
         elementProperties,
         nameParts.concat([prop.name]),
       );
-      nestedStructs.forEach(function(value, key) {
+      nestedStructs.forEach(function (value, key) {
         structs.set(key, value);
       });
 
@@ -644,7 +642,7 @@ function generateStructs(
         elementProperties,
         nameParts.concat([prop.name]),
       );
-      nestedStructs.forEach(function(value, key) {
+      nestedStructs.forEach(function (value, key) {
         structs.set(key, value);
       });
 
@@ -683,7 +681,7 @@ function generateStruct(
   const structName = generateStructName(componentName, structNameParts);
 
   const fields = properties
-    .map(property => {
+    .map((property) => {
       return `${getNativeTypeFromAnnotation(
         componentName,
         property,
@@ -727,15 +725,13 @@ function generateStruct(
       default:
         (property.typeAnnotation.type: empty);
         throw new Error(
-          `Received invalid component property type ${
-            property.typeAnnotation.type
-          }`,
+          `Received invalid component property type ${property.typeAnnotation.type}`,
         );
     }
   });
 
   const fromCases = properties
-    .map(property => {
+    .map((property) => {
       const variable = property.name;
       return `auto ${variable} = map.find("${property.name}");
   if (${variable} != map.end()) {
@@ -764,7 +760,7 @@ module.exports = {
     const allImports: Set<string> = new Set();
 
     const componentClasses = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -772,11 +768,11 @@ module.exports = {
         }
 
         return Object.keys(components)
-          .filter(componentName => {
+          .filter((componentName) => {
             const component = components[componentName];
             return component.excludedPlatform !== 'iOS';
           })
-          .map(componentName => {
+          .map((componentName) => {
             const component = components[componentName];
 
             const newName = `${componentName}Props`;
@@ -813,12 +809,7 @@ module.exports = {
 
     const replacedTemplate = template
       .replace(/::_COMPONENT_CLASSES_::/g, componentClasses)
-      .replace(
-        '::_IMPORTS_::',
-        Array.from(allImports)
-          .sort()
-          .join('\n'),
-      );
+      .replace('::_IMPORTS_::', Array.from(allImports).sort().join('\n'));
 
     return new Map([[fileName, replacedTemplate]]);
   },
diff --git a/packages/react-native-codegen/src/generators/components/GeneratePropsJavaDelegate.js b/packages/react-native-codegen/src/generators/components/GeneratePropsJavaDelegate.js
index 239bf887e3c..59c50fd188d 100644
--- a/packages/react-native-codegen/src/generators/components/GeneratePropsJavaDelegate.js
+++ b/packages/react-native-codegen/src/generators/components/GeneratePropsJavaDelegate.js
@@ -82,14 +82,10 @@ function getJavaValueForProp(
           : `"${typeAnnotation.default}"`;
       return `value == null ? ${defaultValueString} : (String) value`;
     case 'Int32TypeAnnotation':
-      return `value == null ? ${
-        typeAnnotation.default
-      } : ((Double) value).intValue()`;
+      return `value == null ? ${typeAnnotation.default} : ((Double) value).intValue()`;
     case 'DoubleTypeAnnotation':
       if (prop.optional) {
-        return `value == null ? ${
-          typeAnnotation.default
-        }f : ((Double) value).doubleValue()`;
+        return `value == null ? ${typeAnnotation.default}f : ((Double) value).doubleValue()`;
       } else {
         return 'value == null ? Double.NaN : ((Double) value).doubleValue()';
       }
@@ -97,9 +93,7 @@ function getJavaValueForProp(
       if (typeAnnotation.default === null) {
         return 'value == null ? null : ((Double) value).floatValue()';
       } else if (prop.optional) {
-        return `value == null ? ${
-          typeAnnotation.default
-        }f : ((Double) value).floatValue()`;
+        return `value == null ? ${typeAnnotation.default}f : ((Double) value).floatValue()`;
       } else {
         return 'value == null ? Float.NaN : ((Double) value).floatValue()';
       }
@@ -126,9 +120,7 @@ function getJavaValueForProp(
     case 'StringEnumTypeAnnotation':
       return '(String) value';
     case 'Int32EnumTypeAnnotation':
-      return `value == null ? ${
-        typeAnnotation.default
-      } : ((Double) value).intValue()`;
+      return `value == null ? ${typeAnnotation.default} : ((Double) value).intValue()`;
     default:
       (typeAnnotation: empty);
       throw new Error('Received invalid typeAnnotation');
@@ -144,7 +136,7 @@ function generatePropCasesString(
   }
 
   const cases = component.props
-    .map(prop => {
+    .map((prop) => {
       return `case "${prop.name}":
         mViewManager.set${toSafeJavaString(
           prop.name,
@@ -194,7 +186,7 @@ function generateCommandCasesString(
   }
 
   const commandMethods = component.commands
-    .map(command => {
+    .map((command) => {
       return `case "${command.name}":
         viewManager.${toSafeJavaString(
           command.name,
@@ -209,7 +201,7 @@ function generateCommandCasesString(
 
 function getClassExtendString(component): string {
   const extendString = component.extendsProps
-    .map(extendProps => {
+    .map((extendProps) => {
       switch (extendProps.type) {
         case 'ReactNativeBuiltInType':
           switch (extendProps.knownTypeName) {
@@ -262,7 +254,7 @@ module.exports = {
     moduleSpecName: string,
   ): FilesOutput {
     const files = new Map();
-    Object.keys(schema.modules).forEach(moduleName => {
+    Object.keys(schema.modules).forEach((moduleName) => {
       const components = schema.modules[moduleName].components;
       // No components in this module
       if (components == null) {
@@ -270,11 +262,11 @@ module.exports = {
       }
 
       return Object.keys(components)
-        .filter(componentName => {
+        .filter((componentName) => {
           const component = components[componentName];
           return component.excludedPlatform !== 'android';
         })
-        .forEach(componentName => {
+        .forEach((componentName) => {
           const component = components[componentName];
           const className = getDelegateJavaClassName(componentName);
           const interfaceClassName = getInterfaceJavaClassName(componentName);
@@ -289,12 +281,7 @@ module.exports = {
           const extendString = getClassExtendString(component);
 
           const replacedTemplate = template
-            .replace(
-              /::_IMPORTS_::/g,
-              Array.from(imports)
-                .sort()
-                .join('\n'),
-            )
+            .replace(/::_IMPORTS_::/g, Array.from(imports).sort().join('\n'))
             .replace(/::_CLASSNAME_::/g, className)
             .replace('::_EXTEND_CLASSES_::', extendString)
             .replace('::_PROP_CASES_::', propsString)
diff --git a/packages/react-native-codegen/src/generators/components/GeneratePropsJavaInterface.js b/packages/react-native-codegen/src/generators/components/GeneratePropsJavaInterface.js
index 51b008bb54d..4c0b69ec350 100644
--- a/packages/react-native-codegen/src/generators/components/GeneratePropsJavaInterface.js
+++ b/packages/react-native-codegen/src/generators/components/GeneratePropsJavaInterface.js
@@ -116,7 +116,7 @@ function generatePropsString(component: ComponentShape, imports) {
   }
 
   return component.props
-    .map(prop => {
+    .map((prop) => {
       return `void set${toSafeJavaString(
         prop.name,
       )}(T view, ${getJavaValueForProp(prop, imports)});`;
@@ -148,7 +148,7 @@ function getCommandArguments(
 ): string {
   return [
     'T view',
-    ...command.typeAnnotation.params.map(param => {
+    ...command.typeAnnotation.params.map((param) => {
       const commandArgJavaType = getCommandArgJavaType(param);
 
       return `${commandArgJavaType} ${param.name}`;
@@ -161,7 +161,7 @@ function generateCommandsString(
   componentName: string,
 ) {
   return component.commands
-    .map(command => {
+    .map((command) => {
       const safeJavaName = toSafeJavaString(command.name, false);
 
       return `void ${safeJavaName}(${getCommandArguments(
@@ -174,7 +174,7 @@ function generateCommandsString(
 
 function getClassExtendString(component): string {
   const extendString = component.extendsProps
-    .map(extendProps => {
+    .map((extendProps) => {
       switch (extendProps.type) {
         case 'ReactNativeBuiltInType':
           switch (extendProps.knownTypeName) {
@@ -201,7 +201,7 @@ module.exports = {
     moduleSpecName: string,
   ): FilesOutput {
     const files = new Map();
-    Object.keys(schema.modules).forEach(moduleName => {
+    Object.keys(schema.modules).forEach((moduleName) => {
       const components = schema.modules[moduleName].components;
       // No components in this module
       if (components == null) {
@@ -209,11 +209,11 @@ module.exports = {
       }
 
       return Object.keys(components)
-        .filter(componentName => {
+        .filter((componentName) => {
           const component = components[componentName];
           return component.excludedPlatform !== 'android';
         })
-        .forEach(componentName => {
+        .forEach((componentName) => {
           const component = components[componentName];
           const className = getInterfaceJavaClassName(componentName);
           const fileName = `${className}.java`;
@@ -227,12 +227,7 @@ module.exports = {
           const extendString = getClassExtendString(component);
 
           const replacedTemplate = template
-            .replace(
-              /::_IMPORTS_::/g,
-              Array.from(imports)
-                .sort()
-                .join('\n'),
-            )
+            .replace(/::_IMPORTS_::/g, Array.from(imports).sort().join('\n'))
             .replace(/::_CLASSNAME_::/g, className)
             .replace('::_EXTEND_CLASSES_::', extendString)
             .replace(
diff --git a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js
index 8784849619f..3ec4013a180 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js
@@ -47,7 +47,7 @@ module.exports = {
     const fileName = 'ShadowNodes.cpp';
 
     const componentNames = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -55,7 +55,7 @@ module.exports = {
         }
 
         return Object.keys(components)
-          .map(componentName => {
+          .map((componentName) => {
             if (components[componentName].interfaceOnly === true) {
               return;
             }
diff --git a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js
index 84c22bc3190..8626aee575b 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js
@@ -59,7 +59,7 @@ module.exports = {
     let hasAnyEvents = false;
 
     const moduleResults = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         // No components in this module
         if (components == null) {
@@ -67,7 +67,7 @@ module.exports = {
         }
 
         return Object.keys(components)
-          .map(componentName => {
+          .map((componentName) => {
             const component = components[componentName];
             if (component.interfaceOnly === true) {
               return;
diff --git a/packages/react-native-codegen/src/generators/components/GenerateTests.js b/packages/react-native-codegen/src/generators/components/GenerateTests.js
index 213ee3ba4d2..3d6adf08761 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateTests.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateTests.js
@@ -53,7 +53,7 @@ TEST(::_COMPONENT_NAME_::_::_TEST_NAME_::, etc) {
 function getTestCasesForProp(propName, typeAnnotation) {
   const cases = [];
   if (typeAnnotation.type === 'StringEnumTypeAnnotation') {
-    typeAnnotation.options.forEach(option =>
+    typeAnnotation.options.forEach((option) =>
       cases.push({
         propName,
         testName: `${propName}_${toSafeCppString(option.name)}`,
@@ -146,14 +146,14 @@ module.exports = {
     ]);
 
     const componentTests = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const components = schema.modules[moduleName].components;
         if (components == null) {
           return null;
         }
 
         return Object.keys(components)
-          .map(componentName => {
+          .map((componentName) => {
             const component = components[componentName];
             const name = `${componentName}Props`;
 
@@ -167,10 +167,7 @@ module.exports = {
       .filter(Boolean)
       .join('');
 
-    const imports = Array.from(allImports)
-      .sort()
-      .join('\n')
-      .trim();
+    const imports = Array.from(allImports).sort().join('\n').trim();
 
     const replacedTemplate = fileTemplate
       .replace(/::_IMPORTS_::/g, imports)
diff --git a/packages/react-native-codegen/src/generators/components/GenerateViewConfigJs.js b/packages/react-native-codegen/src/generators/components/GenerateViewConfigJs.js
index 5ccb3dad12c..5df65920e17 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateViewConfigJs.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateViewConfigJs.js
@@ -78,9 +78,7 @@ function getReactDiffProcessValue(typeAnnotation) {
             return j.literal(true);
           default:
             throw new Error(
-              `Received unknown array native typeAnnotation: "${
-                typeAnnotation.elementType.name
-              }"`,
+              `Received unknown array native typeAnnotation: "${typeAnnotation.elementType.name}"`,
             );
         }
       }
@@ -128,7 +126,7 @@ function normalizeInputEventName(name) {
 
 // Replicates the behavior of viewConfig in RCTComponentData.m
 function getValidAttributesForEvents(events) {
-  return events.map(eventType => {
+  return events.map((eventType) => {
     return j.property('init', j.identifier(eventType.name), j.literal(true));
   });
 }
@@ -177,7 +175,7 @@ function buildViewConfig(
   const componentProps = component.props;
   const componentEvents = component.events;
 
-  component.extendsProps.forEach(extendProps => {
+  component.extendsProps.forEach((extendProps) => {
     switch (extendProps.type) {
       case 'ReactNativeBuiltInType':
         switch (extendProps.knownTypeName) {
@@ -198,7 +196,7 @@ function buildViewConfig(
   });
 
   const validAttributes = j.objectExpression([
-    ...componentProps.map(schemaProp => {
+    ...componentProps.map((schemaProp) => {
       return j.property(
         'init',
         j.identifier(schemaProp.name),
@@ -209,7 +207,7 @@ function buildViewConfig(
   ]);
 
   const bubblingEventNames = component.events
-    .filter(event => event.bubblingType === 'bubble')
+    .filter((event) => event.bubblingType === 'bubble')
     .reduce((bubblingEvents, event) => {
       // We add in the deprecated paper name so that it is in the view config.
       // This means either the old event name or the new event name can fire
@@ -233,7 +231,7 @@ function buildViewConfig(
       : null;
 
   const directEventNames = component.events
-    .filter(event => event.bubblingType === 'direct')
+    .filter((event) => event.bubblingType === 'direct')
     .reduce((directEvents, event) => {
       // We add in the deprecated paper name so that it is in the view config.
       // This means either the old event name or the new event name can fire
@@ -286,14 +284,14 @@ function buildCommands(
     'const {dispatchCommand} = require("react-native/Libraries/Renderer/shims/ReactNative");',
   );
 
-  const properties = commands.map(command => {
+  const properties = commands.map((command) => {
     const commandName = command.name;
     const params = command.typeAnnotation.params;
 
     const commandNameLiteral = j.literal(commandName);
     const commandNameIdentifier = j.identifier(commandName);
     const arrayParams = j.arrayExpression(
-      params.map(param => {
+      params.map((param) => {
         return j.identifier(param.name);
       }),
     );
@@ -301,7 +299,7 @@ function buildCommands(
     const expression = j.template
       .expression`dispatchCommand(ref, ${commandNameLiteral}, ${arrayParams})`;
 
-    const functionParams = params.map(param => {
+    const functionParams = params.map((param) => {
       return j.identifier(param.name);
     });
 
@@ -336,7 +334,7 @@ module.exports = {
       const imports: Set<string> = new Set();
 
       const moduleResults = Object.keys(schema.modules)
-        .map(moduleName => {
+        .map((moduleName) => {
           const components = schema.modules[moduleName].components;
           // No components in this module
           if (components == null) {
@@ -344,7 +342,7 @@ module.exports = {
           }
 
           return Object.keys(components)
-            .map(componentName => {
+            .map((componentName) => {
               const component = components[componentName];
 
               const paperComponentName = component.paperComponentName
@@ -413,12 +411,7 @@ module.exports = {
 
       const replacedTemplate = template
         .replace(/::_COMPONENT_CONFIG_::/g, moduleResults)
-        .replace(
-          '::_IMPORTS_::',
-          Array.from(imports)
-            .sort()
-            .join('\n'),
-        );
+        .replace('::_IMPORTS_::', Array.from(imports).sort().join('\n'));
 
       return new Map([[fileName, replacedTemplate]]);
     } catch (error) {
diff --git a/packages/react-native-codegen/src/generators/components/JavaHelpers.js b/packages/react-native-codegen/src/generators/components/JavaHelpers.js
index affb28a2140..a4dea0d0040 100644
--- a/packages/react-native-codegen/src/generators/components/JavaHelpers.js
+++ b/packages/react-native-codegen/src/generators/components/JavaHelpers.js
@@ -43,7 +43,7 @@ function getImports(
 ): Set<string> {
   const imports: Set<string> = new Set();
 
-  component.extendsProps.forEach(extendProps => {
+  component.extendsProps.forEach((extendProps) => {
     switch (extendProps.type) {
       case 'ReactNativeBuiltInType':
         switch (extendProps.knownTypeName) {
@@ -84,7 +84,7 @@ function getImports(
     }
   }
 
-  component.props.forEach(prop => {
+  component.props.forEach((prop) => {
     const typeAnnotation = prop.typeAnnotation;
 
     if (typeAnnotation.type === 'NativePrimitiveTypeAnnotation') {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentDescriptorH-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentDescriptorH-test.js
index c73dd315c8b..4436e2c5009 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentDescriptorH-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentDescriptorH-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateComponentDescriptorH.js');
 describe('GenerateComponentDescriptorH', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentHObjCpp-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentHObjCpp-test.js
index 44528dbbb02..85cc1879dfe 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentHObjCpp-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateComponentHObjCpp-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateComponentHObjCpp.js');
 describe('GenerateComponentHObjCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterCpp-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterCpp-test.js
index 5a17690e597..b621e814064 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterCpp-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterCpp-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateEventEmitterCpp.js');
 describe('GenerateEventEmitterCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterH-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterH-test.js
index 3b1974f6653..f58293dba44 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterH-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateEventEmitterH-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateEventEmitterH.js');
 describe('GenerateEventEmitterH', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsCpp-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsCpp-test.js
index 284c5457aca..f8651a76a1d 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsCpp-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsCpp-test.js
@@ -17,7 +17,7 @@ const generator = require('../GeneratePropsCpp.js');
 describe('GeneratePropsCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsH-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsH-test.js
index 23f8769ebeb..5767ad1b7fa 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsH-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsH-test.js
@@ -17,7 +17,7 @@ const generator = require('../GeneratePropsH.js');
 describe('GeneratePropsH', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaDelegate-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaDelegate-test.js
index b9c5724c914..10b8ee219e2 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaDelegate-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaDelegate-test.js
@@ -17,7 +17,7 @@ const generator = require('../GeneratePropsJavaDelegate.js');
 describe('GeneratePropsJavaDelegate', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaInterface-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaInterface-test.js
index a14ac875cc7..e0bb688399a 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaInterface-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GeneratePropsJavaInterface-test.js
@@ -17,7 +17,7 @@ const generator = require('../GeneratePropsJavaInterface.js');
 describe('GeneratePropsJavaInterface', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeCpp-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeCpp-test.js
index b3cc7efdcab..9fe6964c33d 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeCpp-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeCpp-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateShadowNodeCpp.js');
 describe('GenerateShadowNodeCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeH-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeH-test.js
index 3edd5e3695f..f72b95a0e51 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeH-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateShadowNodeH-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateShadowNodeH.js');
 describe('GenerateShadowNodeH', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateTests-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateTests-test.js
index 8b9f066b0c1..47e0a4ddffc 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateTests-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateTests-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateTests.js');
 describe('GenerateTests', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/GenerateViewConfigJs-test.js b/packages/react-native-codegen/src/generators/components/__tests__/GenerateViewConfigJs-test.js
index 039398cb51d..46ba65785ff 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/GenerateViewConfigJs-test.js
+++ b/packages/react-native-codegen/src/generators/components/__tests__/GenerateViewConfigJs-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateViewConfigJs.js');
 describe('GenerateViewConfigJs', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/modules/GenerateModuleCpp.js b/packages/react-native-codegen/src/generators/modules/GenerateModuleCpp.js
index dd2eb05858f..15f74af568d 100644
--- a/packages/react-native-codegen/src/generators/modules/GenerateModuleCpp.js
+++ b/packages/react-native-codegen/src/generators/modules/GenerateModuleCpp.js
@@ -112,7 +112,7 @@ module.exports = {
     moduleSpecName: string,
   ): FilesOutput {
     const nativeModules = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const modules = schema.modules[moduleName].nativeModules;
         if (modules == null) {
           return null;
@@ -124,10 +124,10 @@ module.exports = {
       .reduce((acc, modules) => Object.assign(acc, modules), {});
 
     const modules = Object.keys(nativeModules)
-      .map(name => {
+      .map((name) => {
         const {properties} = nativeModules[name];
         const traversedProperties = properties
-          .map(property => traverseProprety(property))
+          .map((property) => traverseProprety(property))
           .join('\n');
         return moduleTemplate
           .replace(/::_MODULE_PROPERTIES_::/g, traversedProperties)
diff --git a/packages/react-native-codegen/src/generators/modules/GenerateModuleH.js b/packages/react-native-codegen/src/generators/modules/GenerateModuleH.js
index d731fe0a3cd..b07d7cd586d 100644
--- a/packages/react-native-codegen/src/generators/modules/GenerateModuleH.js
+++ b/packages/react-native-codegen/src/generators/modules/GenerateModuleH.js
@@ -90,7 +90,7 @@ module.exports = {
     moduleSpecName: string,
   ): FilesOutput {
     const nativeModules = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const modules = schema.modules[moduleName].nativeModules;
         if (modules == null) {
           return null;
@@ -102,17 +102,15 @@ module.exports = {
       .reduce((acc, components) => Object.assign(acc, components), {});
 
     const modules = Object.keys(nativeModules)
-      .map(name => {
+      .map((name) => {
         const {properties} = nativeModules[name];
         const traversedProperties = properties
-          .map(prop => {
+          .map((prop) => {
             const traversedArgs = prop.typeAnnotation.params
-              .map(param => {
+              .map((param) => {
                 const translatedParam = translatePrimitiveJSTypeToCpp(
                   param.typeAnnotation,
-                  `Unspopported type for param "${param.name}" in ${
-                    prop.name
-                  }. Found: ${param.typeAnnotation.type}`,
+                  `Unspopported type for param "${param.name}" in ${prop.name}. Found: ${param.typeAnnotation.type}`,
                 );
                 const isObject = translatedParam.startsWith('jsi::');
                 return (
@@ -128,9 +126,7 @@ module.exports = {
                 '::_RETURN_VALUE_::',
                 translatePrimitiveJSTypeToCpp(
                   prop.typeAnnotation.returnTypeAnnotation,
-                  `Unspopported return type for ${prop.name}. Found: ${
-                    prop.typeAnnotation.returnTypeAnnotation.type
-                  }`,
+                  `Unspopported return type for ${prop.name}. Found: ${prop.typeAnnotation.returnTypeAnnotation.type}`,
                 ),
               )
               .replace(
diff --git a/packages/react-native-codegen/src/generators/modules/GenerateModuleHObjCpp.js b/packages/react-native-codegen/src/generators/modules/GenerateModuleHObjCpp.js
index 1bcf172c887..ca7e3eaa924 100644
--- a/packages/react-native-codegen/src/generators/modules/GenerateModuleHObjCpp.js
+++ b/packages/react-native-codegen/src/generators/modules/GenerateModuleHObjCpp.js
@@ -38,7 +38,7 @@ const protocolTemplate = `
 @end
 `;
 
-const callbackArgs = prop =>
+const callbackArgs = (prop) =>
   prop.typeAnnotation.returnTypeAnnotation.type ===
   'GenericPromiseTypeAnnotation'
     ? `${
@@ -159,7 +159,7 @@ module.exports = {
     moduleSpecName: string,
   ): FilesOutput {
     const nativeModules = Object.keys(schema.modules)
-      .map(moduleName => {
+      .map((moduleName) => {
         const modules = schema.modules[moduleName].nativeModules;
         if (modules == null) {
           return null;
@@ -171,15 +171,15 @@ module.exports = {
       .reduce((acc, components) => Object.assign(acc, components), {});
 
     const modules = Object.keys(nativeModules)
-      .map(name => moduleTemplate.replace(/::_MODULE_NAME_::/g, name))
+      .map((name) => moduleTemplate.replace(/::_MODULE_NAME_::/g, name))
       .join('\n');
 
     const protocols = Object.keys(nativeModules)
-      .map(name => {
+      .map((name) => {
         const objectForGeneratingStructs: Array<ObjectForGeneratingStructs> = [];
         const {properties} = nativeModules[name];
         const implementations = properties
-          .map(prop => {
+          .map((prop) => {
             const nativeArgs = prop.typeAnnotation.params
               .map((param, i) => {
                 let paramObjCType;
@@ -201,9 +201,7 @@ module.exports = {
                 } else {
                   paramObjCType = translatePrimitiveJSTypeToObjCType(
                     param,
-                    `Unspopported type for param "${param.name}" in ${
-                      prop.name
-                    }. Found: ${param.typeAnnotation.type}`,
+                    `Unspopported type for param "${param.name}" in ${prop.name}. Found: ${param.typeAnnotation.type}`,
                   );
                 }
                 return `${i === 0 ? '' : param.name}:(${paramObjCType})${
@@ -232,9 +230,7 @@ module.exports = {
                 '::_RETURN_VALUE_::',
                 translatePrimitiveJSTypeToObjCTypeForReturn(
                   returnTypeAnnotation,
-                  `Unspopported return type for ${prop.name}. Found: ${
-                    prop.typeAnnotation.returnTypeAnnotation.type
-                  }`,
+                  `Unspopported return type for ${prop.name}. Found: ${prop.typeAnnotation.returnTypeAnnotation.type}`,
                 ),
               )
               .replace('::_ARGS_::', nativeArgs);
diff --git a/packages/react-native-codegen/src/generators/modules/GenerateModuleMm.js b/packages/react-native-codegen/src/generators/modules/GenerateModuleMm.js
index eb624180552..38e68be794d 100644
--- a/packages/react-native-codegen/src/generators/modules/GenerateModuleMm.js
+++ b/packages/react-native-codegen/src/generators/modules/GenerateModuleMm.js
@@ -105,7 +105,7 @@ function tranlsateMethodForImplementation(property): string {
       ? 2
       : 0);
   const translatedArguments = property.typeAnnotation.params
-    .map(param => param.name)
+    .map((param) => param.name)
     .concat(
       property.typeAnnotation.returnTypeAnnotation.type ===
         'GenericPromiseTypeAnnotation'
@@ -149,7 +149,7 @@ module.exports = {
     const nativeModules: {[name: string]: NativeModuleShape, ...} = Object.keys(
       schema.modules,
     )
-      .map(moduleName => {
+      .map((moduleName) => {
         const modules = schema.modules[moduleName].nativeModules;
         if (modules == null) {
           return null;
@@ -182,7 +182,7 @@ module.exports = {
               if (property.typeAnnotation.params) {
                 return moduleAcc.concat(
                   property.typeAnnotation.params
-                    .map(param => {
+                    .map((param) => {
                       if (
                         param.typeAnnotation.type === 'ObjectTypeAnnotation'
                       ) {
@@ -206,7 +206,7 @@ module.exports = {
               return moduleAcc;
             }, []),
           )
-            .map(object =>
+            .map((object) =>
               getterTemplate
                 .replace(/::_GETTER_NAME_::/g, object.name)
                 .replace(/::_MODULE_NAME_::/g, moduleName),
@@ -217,10 +217,10 @@ module.exports = {
       .join('\n');
 
     const modules = Object.keys(nativeModules)
-      .map(name => {
+      .map((name) => {
         const {properties} = nativeModules[name];
         const translatedMethods = properties
-          .map(property => tranlsateMethodForImplementation(property))
+          .map((property) => tranlsateMethodForImplementation(property))
           .join('\n');
         return moduleTemplate
           .replace(/::_TURBOMODULE_METHOD_INVOKERS_::/g, translatedMethods)
diff --git a/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructs.js b/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructs.js
index 73614202abf..db8699e5a31 100644
--- a/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructs.js
+++ b/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructs.js
@@ -66,9 +66,7 @@ function getInlineMethodSignature(
     case 'AnyTypeAnnotation':
       return `id<NSObject> ${property.name}() const;`;
     case 'ArrayTypeAnnotation':
-      return `facebook::react::LazyVector<id<NSObject>> ${
-        property.name
-      }() const;`;
+      return `facebook::react::LazyVector<id<NSObject>> ${property.name}() const;`;
     case 'FunctionTypeAnnotation':
     default:
       throw new Error(`Unknown prop type, found: ${typeAnnotation.type}"`);
@@ -147,7 +145,7 @@ function translateObjectsForStructs(
     .reduce(
       (acc, object) =>
         acc.concat(
-          object.properties.map(property =>
+          object.properties.map((property) =>
             getInlineMethodImplementation(property, object.name)
               .replace(/::_PROPERTY_NAME_::/g, property.name)
               .replace(/::_STRUCT_NAME_::/g, object.name),
@@ -158,12 +156,12 @@ function translateObjectsForStructs(
     .join('\n');
 
   const translatedStructs = flattenObjects
-    .map(object =>
+    .map((object) =>
       structTemplate
         .replace(
           /::_STRUCT_PROPERTIES_::/g,
           object.properties
-            .map(property => getInlineMethodSignature(property, object.name))
+            .map((property) => getInlineMethodSignature(property, object.name))
             .join('\n      '),
         )
         .replace(/::_STRUCT_NAME_::/g, object.name),
diff --git a/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructsForConstants.js b/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructsForConstants.js
index a0098654c82..e8c5be7b257 100644
--- a/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructsForConstants.js
+++ b/packages/react-native-codegen/src/generators/modules/ObjCppUtils/GenerateStructsForConstants.js
@@ -185,7 +185,7 @@ function generateStructsForConstants(
             .replace(
               /::_INPUT_::/g,
               object.properties
-                .map(property =>
+                .map((property) =>
                   getBuilderInputFieldDeclaration(property, object.name),
                 )
                 .join('\n          '),
@@ -193,7 +193,7 @@ function generateStructsForConstants(
             .replace(
               /::_PROPERTIES_::/g,
               object.properties
-                .map(property => getObjectProperty(property))
+                .map((property) => getObjectProperty(property))
                 .join('\n'),
             )
             .replace(/::_STRUCT_NAME_::/g, object.name),
diff --git a/packages/react-native-codegen/src/generators/modules/ObjCppUtils/Utils.js b/packages/react-native-codegen/src/generators/modules/ObjCppUtils/Utils.js
index ee0f9286908..1bf34529a17 100644
--- a/packages/react-native-codegen/src/generators/modules/ObjCppUtils/Utils.js
+++ b/packages/react-native-codegen/src/generators/modules/ObjCppUtils/Utils.js
@@ -37,16 +37,16 @@ function flatObjects(
     properties: $ReadOnlyArray<ObjectParamTypeAnnotation>,
     name: string,
   |}> = annotations
-    .map(annotation => ({
+    .map((annotation) => ({
       name: annotation.name,
       properties: annotation.object.properties,
     }))
     .filter(
-      annotation =>
+      (annotation) =>
         (annotation.name === 'GetConstantsReturnType') === forConstants,
     )
     .filter(
-      annotation =>
+      (annotation) =>
         annotation.name !== 'GetConstantsReturnType' ||
         annotation.properties.length > 0,
     );
@@ -60,7 +60,7 @@ function flatObjects(
     const oldObjectTypesToFlatten = objectTypesToFlatten;
     objectTypesToFlatten = [];
     flattenObjects = flattenObjects.concat(
-      oldObjectTypesToFlatten.map(object => {
+      oldObjectTypesToFlatten.map((object) => {
         const {properties} = object;
         if (properties !== undefined) {
           objectTypesToFlatten = objectTypesToFlatten.concat(
diff --git a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleCpp-test.js b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleCpp-test.js
index 6dbe02f952f..dfbc0c7ce83 100644
--- a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleCpp-test.js
+++ b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleCpp-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateModuleCpp.js');
 describe('GenerateModuleCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleH-test.js b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleH-test.js
index 918184b9ff5..77c9b5dfc13 100644
--- a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleH-test.js
+++ b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleH-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateModuleH.js');
 describe('GenerateModuleCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleHObjCpp-test.js b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleHObjCpp-test.js
index b41441cb2da..c067f08040b 100644
--- a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleHObjCpp-test.js
+++ b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleHObjCpp-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateModuleHObjCpp.js');
 describe('GenerateModuleHObjCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleMm-test.js b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleMm-test.js
index d6a59847b4a..4aa5d43920e 100644
--- a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleMm-test.js
+++ b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateModuleMm-test.js
@@ -17,7 +17,7 @@ const generator = require('../GenerateModuleMm.js');
 describe('GenerateModuleHObjCpp', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateStructs-test.js b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateStructs-test.js
index ef865d1ef80..af6c3cf6541 100644
--- a/packages/react-native-codegen/src/generators/modules/__tests__/GenerateStructs-test.js
+++ b/packages/react-native-codegen/src/generators/modules/__tests__/GenerateStructs-test.js
@@ -17,7 +17,7 @@ const generator = require('../ObjCppUtils/GenerateStructs.js');
 describe('GenerateStructs', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       const fixture = fixtures[fixtureName];
 
       it(`can generate fixture ${fixtureName}`, () => {
diff --git a/packages/react-native-codegen/src/parsers/flow/components/__tests__/component-parser-test.js b/packages/react-native-codegen/src/parsers/flow/components/__tests__/component-parser-test.js
index 0f5a94a00cf..99d64fe258d 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/__tests__/component-parser-test.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/__tests__/component-parser-test.js
@@ -15,13 +15,13 @@ const FlowParser = require('../../index.js');
 const fixtures = require('../__test_fixtures__/fixtures.js');
 const failureFixtures = require('../__test_fixtures__/failures.js');
 jest.mock('fs', () => ({
-  readFileSync: filename => fixtures[filename] || failureFixtures[filename],
+  readFileSync: (filename) => fixtures[filename] || failureFixtures[filename],
 }));
 
 describe('RN Codegen Flow Parser', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       it(`can generate fixture ${fixtureName}`, () => {
         expect(FlowParser.parseFile(fixtureName)).toMatchSnapshot();
       });
@@ -29,7 +29,7 @@ describe('RN Codegen Flow Parser', () => {
 
   Object.keys(failureFixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       it(`Fails with error message ${fixtureName}`, () => {
         expect(() => {
           FlowParser.parseFile(fixtureName);
diff --git a/packages/react-native-codegen/src/parsers/flow/components/commands.js b/packages/react-native-codegen/src/parsers/flow/components/commands.js
index 0232a82d1f4..fb4d8eb18a9 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/commands.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/commands.js
@@ -37,7 +37,7 @@ function buildCommandSchema(property, types: TypeMap) {
     );
   }
 
-  const params = value.params.slice(1).map(param => {
+  const params = value.params.slice(1).map((param) => {
     const paramName = param.name.name;
     const paramValue = getValueFromTypes(param.typeAnnotation, types);
     const type =
@@ -95,8 +95,8 @@ function getCommands(
   types: TypeMap,
 ): $ReadOnlyArray<CommandTypeShape> {
   return commandTypeAST
-    .filter(property => property.type === 'ObjectTypeProperty')
-    .map(property => buildCommandSchema(property, types))
+    .filter((property) => property.type === 'ObjectTypeProperty')
+    .map((property) => buildCommandSchema(property, types))
     .filter(Boolean);
 }
 
diff --git a/packages/react-native-codegen/src/parsers/flow/components/events.js b/packages/react-native-codegen/src/parsers/flow/components/events.js
index bb748d48eec..c4010f52d7c 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/events.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/events.js
@@ -64,7 +64,7 @@ function getPropertyType(name, optional, typeAnnotation) {
         type: 'StringEnumTypeAnnotation',
         name,
         optional,
-        options: typeAnnotation.types.map(option => ({name: option.value})),
+        options: typeAnnotation.types.map((option) => ({name: option.value})),
       };
     default:
       (type: empty);
@@ -220,8 +220,8 @@ function getEvents(
   types: TypeMap,
 ): $ReadOnlyArray<EventTypeShape> {
   return eventTypeAST
-    .filter(property => property.type === 'ObjectTypeProperty')
-    .map(property => buildEventSchema(types, property))
+    .filter((property) => property.type === 'ObjectTypeProperty')
+    .map((property) => buildEventSchema(types, property))
     .filter(Boolean);
 }
 
diff --git a/packages/react-native-codegen/src/parsers/flow/components/extends.js b/packages/react-native-codegen/src/parsers/flow/components/extends.js
index 77081974a30..1920b089a3c 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/extends.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/extends.js
@@ -41,7 +41,7 @@ function removeKnownExtends(
   types: TypeMap,
 ): $ReadOnlyArray<PropsAST> {
   return typeDefinition.filter(
-    prop =>
+    (prop) =>
       prop.type !== 'ObjectTypeSpreadProperty' ||
       extendsForProp(prop, types) === null,
   );
@@ -55,8 +55,8 @@ function getExtendsProps(
   types: TypeMap,
 ): $ReadOnlyArray<ExtendsPropsShape> {
   return typeDefinition
-    .filter(prop => prop.type === 'ObjectTypeSpreadProperty')
-    .map(prop => extendsForProp(prop, types))
+    .filter((prop) => prop.type === 'ObjectTypeSpreadProperty')
+    .map((prop) => extendsForProp(prop, types))
     .filter(Boolean);
 }
 
diff --git a/packages/react-native-codegen/src/parsers/flow/components/index.js b/packages/react-native-codegen/src/parsers/flow/components/index.js
index 2ae19153b94..543cac66c30 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/index.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/index.js
@@ -21,10 +21,10 @@ function findComponentConfig(ast) {
   const foundConfigs = [];
 
   const defaultExports = ast.body.filter(
-    node => node.type === 'ExportDefaultDeclaration',
+    (node) => node.type === 'ExportDefaultDeclaration',
   );
 
-  defaultExports.forEach(statement => {
+  defaultExports.forEach((statement) => {
     let declaration = statement.declaration;
 
     // codegenNativeComponent can be nested inside a cast
@@ -61,11 +61,11 @@ function findComponentConfig(ast) {
   const foundConfig = foundConfigs[0];
 
   const namedExports = ast.body.filter(
-    node => node.type === 'ExportNamedDeclaration',
+    (node) => node.type === 'ExportNamedDeclaration',
   );
 
   const commandsTypeNames = namedExports
-    .map(statement => {
+    .map((statement) => {
       let callExpression;
       let calleeName;
       try {
@@ -127,9 +127,7 @@ function getCommandProperties(commandTypeName, types, commandOptions) {
 
   if (typeAlias.type !== 'InterfaceDeclaration') {
     throw new Error(
-      `The type argument for codegenNativeCommands must be an interface, received ${
-        typeAlias.type
-      }`,
+      `The type argument for codegenNativeCommands must be an interface, received ${typeAlias.type}`,
     );
   }
 
@@ -143,7 +141,7 @@ function getCommandProperties(commandTypeName, types, commandOptions) {
   }
 
   const flowPropertyNames = properties
-    .map(property => property && property.key && property.key.name)
+    .map((property) => property && property.key && property.key.name)
     .filter(Boolean);
 
   if (commandOptions == null || commandOptions.supportedCommands == null) {
@@ -154,7 +152,7 @@ function getCommandProperties(commandTypeName, types, commandOptions) {
 
   if (
     commandOptions.supportedCommands.length !== flowPropertyNames.length ||
-    !commandOptions.supportedCommands.every(supportedCommand =>
+    !commandOptions.supportedCommands.every((supportedCommand) =>
       flowPropertyNames.includes(supportedCommand),
     )
   ) {
diff --git a/packages/react-native-codegen/src/parsers/flow/components/options.js b/packages/react-native-codegen/src/parsers/flow/components/options.js
index f455a5f060a..643ed221ebf 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/options.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/options.js
@@ -33,7 +33,7 @@ function getCommandOptions(
         options[prop.key.name] = (
           (prop && prop.value && prop.value.elements) ||
           []
-        ).map(element => element && element.value);
+        ).map((element) => element && element.value);
         return options;
       },
       {},
diff --git a/packages/react-native-codegen/src/parsers/flow/components/props.js b/packages/react-native-codegen/src/parsers/flow/components/props.js
index 404289cc8a7..666dc5f34e8 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/props.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/props.js
@@ -54,7 +54,7 @@ function getTypeAnnotationForArray(name, typeAnnotation, defaultValue, types) {
           objectType.typeParameters.params[0].properties,
           types,
         )
-          .map(prop => buildPropSchema(prop, types))
+          .map((prop) => buildPropSchema(prop, types))
           .filter(Boolean),
       };
     }
@@ -75,7 +75,7 @@ function getTypeAnnotationForArray(name, typeAnnotation, defaultValue, types) {
             nestedObjectType.typeParameters.params[0].properties,
             types,
           )
-            .map(prop => buildPropSchema(prop, types))
+            .map((prop) => buildPropSchema(prop, types))
             .filter(Boolean),
         },
       };
@@ -150,7 +150,7 @@ function getTypeAnnotationForArray(name, typeAnnotation, defaultValue, types) {
         return {
           type: 'StringEnumTypeAnnotation',
           default: (defaultValue: string),
-          options: typeAnnotation.types.map(option => ({name: option.value})),
+          options: typeAnnotation.types.map((option) => ({name: option.value})),
         };
       } else if (unionType === 'NumberLiteralTypeAnnotation') {
         throw new Error(
@@ -201,7 +201,7 @@ function getTypeAnnotation(
         typeAnnotation.typeParameters.params[0].properties,
         types,
       )
-        .map(prop => buildPropSchema(prop, types))
+        .map((prop) => buildPropSchema(prop, types))
         .filter(Boolean),
     };
   }
@@ -298,13 +298,15 @@ function getTypeAnnotation(
         return {
           type: 'StringEnumTypeAnnotation',
           default: (defaultValue: string),
-          options: typeAnnotation.types.map(option => ({name: option.value})),
+          options: typeAnnotation.types.map((option) => ({name: option.value})),
         };
       } else if (unionType === 'NumberLiteralTypeAnnotation') {
         return {
           type: 'Int32EnumTypeAnnotation',
           default: (defaultValue: number),
-          options: typeAnnotation.types.map(option => ({value: option.value})),
+          options: typeAnnotation.types.map((option) => ({
+            value: option.value,
+          })),
         };
       } else {
         throw new Error(
@@ -345,8 +347,8 @@ function buildPropSchema(property, types: TypeMap): ?PropTypeShape {
   }
   if (
     value.type === 'NullableTypeAnnotation' &&
-    (typeAnnotation.type === 'GenericTypeAnnotation' &&
-      typeAnnotation.id.name === 'WithDefault')
+    typeAnnotation.type === 'GenericTypeAnnotation' &&
+    typeAnnotation.id.name === 'WithDefault'
   ) {
     throw new Error(
       'WithDefault<> is optional and does not need to be marked as optional. Please remove the ? annotation in front of it.',
@@ -418,7 +420,7 @@ function verifyPropNotAlreadyDefined(
   needleProp: PropAST,
 ) {
   const propName = needleProp.key.name;
-  const foundProp = props.some(prop => prop.key.name === propName);
+  const foundProp = props.some((prop) => prop.key.name === propName);
   if (foundProp) {
     throw new Error(`A prop was already defined with the name ${propName}`);
   }
@@ -429,7 +431,7 @@ function flattenProperties(
   types: TypeMap,
 ) {
   return typeDefinition
-    .map(property => {
+    .map((property) => {
       if (property.type === 'ObjectTypeProperty') {
         return property;
       } else if (property.type === 'ObjectTypeSpreadProperty') {
@@ -441,7 +443,7 @@ function flattenProperties(
     })
     .reduce((acc, item) => {
       if (Array.isArray(item)) {
-        item.forEach(prop => {
+        item.forEach((prop) => {
           verifyPropNotAlreadyDefined(acc, prop);
         });
         return acc.concat(item);
@@ -459,7 +461,7 @@ function getProps(
   types: TypeMap,
 ): $ReadOnlyArray<PropTypeShape> {
   return flattenProperties(typeDefinition, types)
-    .map(property => buildPropSchema(property, types))
+    .map((property) => buildPropSchema(property, types))
     .filter(Boolean);
 }
 
diff --git a/packages/react-native-codegen/src/parsers/flow/index.js b/packages/react-native-codegen/src/parsers/flow/index.js
index 4de02b00943..e38b660e7ed 100644
--- a/packages/react-native-codegen/src/parsers/flow/index.js
+++ b/packages/react-native-codegen/src/parsers/flow/index.js
@@ -38,7 +38,7 @@ function getTypes(ast) {
 
 function getConfigType(ast, types): 'module' | 'component' {
   const defaultExports = ast.body.filter(
-    node => node.type === 'ExportDefaultDeclaration',
+    (node) => node.type === 'ExportDefaultDeclaration',
   );
 
   let isComponent = false;
@@ -58,9 +58,9 @@ function getConfigType(ast, types): 'module' | 'component' {
   }
 
   const typesExtendingTurboModule = Object.keys(types)
-    .map(typeName => types[typeName])
+    .map((typeName) => types[typeName])
     .filter(
-      type =>
+      (type) =>
         type.extends &&
         type.extends[0] &&
         type.extends[0].id.name === 'TurboModule',
diff --git a/packages/react-native-codegen/src/parsers/flow/modules/__tests__/module-parser-test.js b/packages/react-native-codegen/src/parsers/flow/modules/__tests__/module-parser-test.js
index 23114e86caa..24d5da3c7f7 100644
--- a/packages/react-native-codegen/src/parsers/flow/modules/__tests__/module-parser-test.js
+++ b/packages/react-native-codegen/src/parsers/flow/modules/__tests__/module-parser-test.js
@@ -15,13 +15,13 @@ const FlowParser = require('../../index.js');
 const fixtures = require('../__test_fixtures__/fixtures.js');
 const failureFixtures = require('../__test_fixtures__/failures.js');
 jest.mock('fs', () => ({
-  readFileSync: filename => fixtures[filename] || failureFixtures[filename],
+  readFileSync: (filename) => fixtures[filename] || failureFixtures[filename],
 }));
 
 describe('RN Codegen Flow Parser', () => {
   Object.keys(fixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       it(`can generate fixture ${fixtureName}`, () => {
         expect(FlowParser.parseModuleFixture(fixtureName)).toMatchSnapshot();
       });
@@ -29,7 +29,7 @@ describe('RN Codegen Flow Parser', () => {
 
   Object.keys(failureFixtures)
     .sort()
-    .forEach(fixtureName => {
+    .forEach((fixtureName) => {
       it(`Fails with error message ${fixtureName}`, () => {
         expect(() => {
           FlowParser.parseModuleFixture(fixtureName);
diff --git a/packages/react-native-codegen/src/parsers/flow/modules/index.js b/packages/react-native-codegen/src/parsers/flow/modules/index.js
index b610dc30e4b..d03d3478dcd 100644
--- a/packages/react-native-codegen/src/parsers/flow/modules/index.js
+++ b/packages/react-native-codegen/src/parsers/flow/modules/index.js
@@ -24,9 +24,9 @@ function getModuleProperties(types, interfaceName) {
 
 function findInterfaceName(types) {
   return Object.keys(types)
-    .map(typeName => types[typeName])
+    .map((typeName) => types[typeName])
     .filter(
-      type =>
+      (type) =>
         type.extends &&
         type.extends[0] &&
         type.extends[0].id.name === 'TurboModule',
diff --git a/packages/react-native-codegen/src/parsers/flow/modules/methods.js b/packages/react-native-codegen/src/parsers/flow/modules/methods.js
index 2c07b29dc7e..d83faafdc80 100644
--- a/packages/react-native-codegen/src/parsers/flow/modules/methods.js
+++ b/packages/react-native-codegen/src/parsers/flow/modules/methods.js
@@ -30,7 +30,7 @@ function getObjectProperties(
   paramName: string,
   types: TypeMap,
 ): $ReadOnlyArray<ObjectParamTypeAnnotation> {
-  return objectParam.properties.map(objectTypeProperty => {
+  return objectParam.properties.map((objectTypeProperty) => {
     let optional = objectTypeProperty.optional;
     let value = objectTypeProperty.value;
     if (value.type === 'NullableTypeAnnotation') {
@@ -406,12 +406,10 @@ function buildMethodSchema(
   const value = getValueFromTypes(property.value, types);
   if (value.type !== 'FunctionTypeAnnotation') {
     throw new Error(
-      `Only methods are supported as module properties. Found ${
-        value.type
-      } in ${property.key.name}`,
+      `Only methods are supported as module properties. Found ${value.type} in ${property.key.name}`,
     );
   }
-  const params = value.params.map(param =>
+  const params = value.params.map((param) =>
     getTypeAnnotationForParam(name, param, types),
   );
 
@@ -436,8 +434,8 @@ function getMethods(
   types: TypeMap,
 ): $ReadOnlyArray<MethodTypeShape> {
   return typeDefinition
-    .filter(property => property.type === 'ObjectTypeProperty')
-    .map(property => buildMethodSchema(property, types))
+    .filter((property) => property.type === 'ObjectTypeProperty')
+    .map((property) => buildMethodSchema(property, types))
     .filter(Boolean);
 }
 
diff --git a/scripts/android-e2e-test.js b/scripts/android-e2e-test.js
index 692d19ae33f..5e0ba3730a4 100644
--- a/scripts/android-e2e-test.js
+++ b/scripts/android-e2e-test.js
@@ -40,20 +40,20 @@ require('colors');
 // value in ms to print out screen contents, set this value in CI to debug if tests are failing
 const appiumDebugInterval = process.env.APPIUM_DEBUG_INTERVAL;
 
-describe('Android Test App', function() {
+describe('Android Test App', function () {
   this.timeout(600000);
   let driver;
   let debugIntervalId;
 
-  before(function() {
+  before(function () {
     driver = wd.promiseChainRemote({
       host: 'localhost',
       port: 4723,
     });
-    driver.on('status', function(info) {
+    driver.on('status', function (info) {
       console.log(info.cyan);
     });
-    driver.on('command', function(method, command, data) {
+    driver.on('command', function (method, command, data) {
       if (command === 'source()' && data) {
         console.log(
           ' > ' + method.yellow,
@@ -65,7 +65,7 @@ describe('Android Test App', function() {
         console.log(' > ' + method.yellow, command.grey, data || '');
       }
     });
-    driver.on('http', function(method, urlPath, data) {
+    driver.on('http', function (method, urlPath, data) {
       console.log(' > ' + method.magenta, urlPath, (data || '').grey);
     });
 
@@ -90,24 +90,24 @@ describe('Android Test App', function() {
       .setImplicitWaitTimeout(5000)
       .waitForElementByXPath('//android.widget.Button[@text="Reload JS"]')
       .then(
-        elem => {
+        (elem) => {
           elem.click();
           driver.sleep(2000);
         },
-        err => {
+        (err) => {
           // ignoring if Reload JS button can't be located
         },
       );
   });
 
-  after(function() {
+  after(function () {
     if (debugIntervalId) {
       clearInterval(debugIntervalId);
     }
     return driver.quit();
   });
 
-  it('should display new content after a refresh', function() {
+  it('should display new content after a refresh', function () {
     const androidAppCode = fs.readFileSync('App.js', 'utf-8');
     let intervalToUpdate;
     return (
@@ -133,15 +133,12 @@ describe('Android Test App', function() {
         .finally(() => {
           clearInterval(intervalToUpdate);
           fs.writeFileSync('App.js', androidAppCode, 'utf-8');
-          driver
-            .pressDeviceKey(46)
-            .pressDeviceKey(46)
-            .sleep(2000);
+          driver.pressDeviceKey(46).pressDeviceKey(46).sleep(2000);
         })
     );
   });
 
-  it('should have the menu available', function() {
+  it('should have the menu available', function () {
     return (
       driver
         .waitForElementByXPath(
diff --git a/scripts/publish-npm.js b/scripts/publish-npm.js
index 6107a9efd2a..bb66996f335 100644
--- a/scripts/publish-npm.js
+++ b/scripts/publish-npm.js
@@ -90,13 +90,13 @@ const tagsWithVersion = exec(`git ls-remote origin | grep ${currentCommit}`, {
   .stdout.split(/\s/)
   // ['refs/tags/v0.33.0', 'refs/tags/v0.33.0-rc', 'refs/tags/v0.33.0-rc1', 'refs/tags/v0.33.0-rc2', 'refs/tags/v0.34.0']
   .filter(
-    version =>
+    (version) =>
       !!version && version.indexOf(`refs/tags/v${branchVersion}`) === 0,
   )
   // ['refs/tags/v0.33.0', 'refs/tags/v0.33.0-rc', 'refs/tags/v0.33.0-rc1', 'refs/tags/v0.33.0-rc2']
-  .filter(version => version.indexOf(branchVersion) !== -1)
+  .filter((version) => version.indexOf(branchVersion) !== -1)
   // ['v0.33.0', 'v0.33.0-rc', 'v0.33.0-rc1', 'v0.33.0-rc2']
-  .map(version => version.slice('refs/tags/'.length));
+  .map((version) => version.slice('refs/tags/'.length));
 
 if (!nightlyBuild && tagsWithVersion.length === 0) {
   echo(
@@ -137,11 +137,13 @@ exec('git checkout ReactAndroid/gradle.properties');
 
 echo('Generated artifacts for Maven');
 
-let artifacts = ['-javadoc.jar', '-sources.jar', '.aar', '.pom'].map(suffix => {
-  return `react-native-${releaseVersion}${suffix}`;
-});
+let artifacts = ['-javadoc.jar', '-sources.jar', '.aar', '.pom'].map(
+  (suffix) => {
+    return `react-native-${releaseVersion}${suffix}`;
+  },
+);
 
-artifacts.forEach(name => {
+artifacts.forEach((name) => {
   if (
     !test(
       '-e',
diff --git a/scripts/run-android-ci-instrumentation-tests.js b/scripts/run-android-ci-instrumentation-tests.js
index e4812b00416..c2e8715d1a3 100644
--- a/scripts/run-android-ci-instrumentation-tests.js
+++ b/scripts/run-android-ci-instrumentation-tests.js
@@ -36,29 +36,27 @@ const ignoredTests = [
 
 // ReactAndroid/src/androidTest/java/com/facebook/react/tests/ReactHorizontalScrollViewTestCase.java
 const testClasses = ls(`${argv.path}/*.java`)
-  .map(javaFile => {
+  .map((javaFile) => {
     // ReactHorizontalScrollViewTestCase
     return path.basename(javaFile, '.java');
   })
-  .filter(className => {
+  .filter((className) => {
     return ignoredTests.indexOf(className) === -1;
   })
-  .map(className => {
+  .map((className) => {
     // com.facebook.react.tests.ReactHorizontalScrollViewTestCase
     return argv.package + '.' + className;
   });
 
 let exitCode = 0;
-testClasses.forEach(testClass => {
+testClasses.forEach((testClass) => {
   if (
     tryExecNTimes(() => {
       echo(`Starting ${testClass}`);
       // any faster means Circle CI crashes
       exec('sleep 10s');
       return exec(
-        `./scripts/run-instrumentation-tests-via-adb-shell.sh ${
-          argv.package
-        } ${testClass}`,
+        `./scripts/run-instrumentation-tests-via-adb-shell.sh ${argv.package} ${testClass}`,
       ).code;
     }, numberOfRetries)
   ) {
diff --git a/yarn.lock b/yarn.lock
index 490077df817..95e8e1883e7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6241,10 +6241,10 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
-prettier@1.17.0:
-  version "1.17.0"
-  resolved "https://registry.npmjs.org/prettier/-/prettier-1.17.0.tgz#53b303676eed22cc14a9f0cec09b477b3026c008"
-  integrity sha512-sXe5lSt2WQlCbydGETgfm1YBShgOX4HxQkFPvbxkcwgDvGDeqVau8h+12+lmSVlP3rHPz0oavfddSZg/q+Szjw==
+prettier@2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.0.2.tgz#1ba8f3eb92231e769b7fcd7cb73ae1b6b74ade08"
+  integrity sha512-5xJQIPT8BraI7ZnaDwSbu5zLrB6vvi8hVV58yHQ+QK64qrY40dULy0HSRlQ2/2IdzeBpjhDkqdcFBnFeDEMVdg==
 
 pretty-format@^24.0.0:
   version "24.0.0"