Annotate empty arrays in xplat

Summary: Changelog: [Internal]

Differential Revision: D40410427

fbshipit-source-id: f819fcb00673e19b21aecb383541850436805a0e

Libraries/Core/Devtools/parseErrorStack.js

@@ -16,7 +16,7 @@ import type {HermesParsedStack} from './parseHermesStack';
 const parseHermesStack = require('./parseHermesStack');
 
 function convertHermesStack(stack: HermesParsedStack): Array<StackFrame> {
-  const frames = [];
+  const frames: Array<StackFrame> = [];
   for (const entry of stack.entries) {
     if (entry.type !== 'FRAME') {
       continue;

Libraries/Lists/FlatList.js

@@ -571,8 +571,8 @@ class FlatList<ItemT> extends React.PureComponent<Props<ItemT>, void> {
       const numColumns = numColumnsOrDefault(this.props.numColumns);
       if (onViewableItemsChanged) {
         if (numColumns > 1) {
-          const changed = [];
-          const viewableItems = [];
+          const changed: Array<ViewToken> = [];
+          const viewableItems: Array<ViewToken> = [];
           info.viewableItems.forEach(v =>
             this._pushMultiColumnViewable(viewableItems, v),
           );

Libraries/Lists/ViewabilityHelper.js

@@ -214,7 +214,7 @@ class ViewabilityHelper {
     ) {
       return;
     }
-    let viewableIndices = [];
+    let viewableIndices: Array<number> = [];
     if (itemCount) {
       viewableIndices = this.computeViewableItems(
         props,

Libraries/Lists/VirtualizedList.js

@@ -811,7 +811,7 @@ export default class VirtualizedList extends StateSafePureComponent<
         ? styles.horizontallyInverted
         : styles.verticallyInverted
       : null;
-    const cells = [];
+    const cells: Array<any | React.Node> = [];
     const stickyIndicesFromProps = new Set(this.props.stickyHeaderIndices);
     const stickyHeaderIndices = [];
 

Libraries/Lists/VirtualizedSectionList.js

@@ -173,7 +173,7 @@ class VirtualizedSectionList<
     const listHeaderOffset = this.props.ListHeaderComponent ? 1 : 0;
 
     const stickyHeaderIndices = this.props.stickySectionHeadersEnabled
-      ? []
+      ? ([]: Array<number>)
       : undefined;
 
     let itemCount = 0;

Libraries/LogBox/Data/LogBoxSymbolication.js

@@ -27,7 +27,7 @@ const sanitize = ({
   if (!Array.isArray(maybeStack)) {
     throw new Error('Expected stack to be an array.');
   }
-  const stack = [];
+  const stack: Array<StackFrame> = [];
   for (const maybeFrame of maybeStack) {
     let collapse = false;
     if ('collapse' in maybeFrame) {

Libraries/LogBox/Data/__tests__/parseLogBoxLog-test.js

@@ -11,6 +11,8 @@
 
 'use strict';
 
+import type {StackFrame} from '../../../Core/NativeExceptionsManager';
+
 const {parseLogBoxException, parseLogBoxLog} = require('../parseLogBoxLog');
 
 describe('parseLogBoxLog', () => {
@@ -230,7 +232,7 @@ describe('parseLogBoxLog', () => {
       name: '',
       isComponentError: false,
       componentStack: '',
-      stack: [],
+      stack: ([]: Array<StackFrame>),
       id: 0,
       isFatal: true,
     };
@@ -267,7 +269,7 @@ describe('parseLogBoxLog', () => {
       name: '',
       isComponentError: false,
       componentStack: '',
-      stack: [],
+      stack: ([]: Array<StackFrame>),
       id: 0,
       isFatal: true,
     };
@@ -327,7 +329,7 @@ If you are sure the module exists, try these steps:
       name: '',
       isComponentError: false,
       componentStack: '',
-      stack: [],
+      stack: ([]: Array<StackFrame>),
       id: 0,
       isFatal: true,
     };
@@ -381,7 +383,7 @@ If you are sure the module exists, try these steps:
       name: '',
       isComponentError: false,
       componentStack: '',
-      stack: [],
+      stack: ([]: Array<StackFrame>),
       id: 0,
       isFatal: true,
     };
@@ -429,7 +431,7 @@ Please follow the instructions at: fburl.com/rn-remote-assets
       name: '',
       isComponentError: false,
       componentStack: '',
-      stack: [],
+      stack: ([]: Array<StackFrame>),
       id: 0,
       isFatal: true,
     };
@@ -475,7 +477,7 @@ Please follow the instructions at: fburl.com/rn-remote-assets
       name: '',
       isComponentError: false,
       componentStack: '',
-      stack: [],
+      stack: ([]: Array<StackFrame>),
       id: 0,
       isFatal: true,
     };

Libraries/LogBox/Data/parseLogBoxLog.js

@@ -317,7 +317,7 @@ export function parseLogBoxLog(args: $ReadOnlyArray<mixed>): {|
   message: Message,
 |} {
   const message = args[0];
-  let argsWithoutComponentStack = [];
+  let argsWithoutComponentStack: Array<mixed> = [];
   let componentStack: ComponentStack = [];
 
   // Extract component stack from warnings like "Some warning%s".

Libraries/NativeComponent/StaticViewConfigValidator.js

@@ -47,7 +47,7 @@ export function validate(
   nativeViewConfig: ViewConfig,
   staticViewConfig: ViewConfig,
 ): ValidationResult {
-  const differences = [];
+  const differences: Array<Difference> = [];
   accumulateDifferences(
     differences,
     [],

Libraries/Utilities/__tests__/useRefEffect-test.js

@@ -94,7 +94,7 @@ function mockEffectRegistry(): {
   mockEffectWithoutCleanup: string => () => void,
   registry: $ReadOnlyArray<TestEffect | TestEffectCleanup>,
 } {
-  const registry = [];
+  const registry: Array<TestEffect | TestEffectCleanup> = [];
   return {
     mockEffect(name: string): () => () => void {
       return instance => {

Libraries/Utilities/groupByEveryN.js

@@ -28,7 +28,7 @@
 
 function groupByEveryN<T>(array: Array<T>, n: number): Array<Array<?T>> {
   const result = [];
-  let temp = [];
+  let temp: Array<?T> = [];
 
   for (let i = 0; i < array.length; ++i) {
     if (i > 0 && i % n === 0) {

Libraries/Utilities/stringifySafe.js

@@ -26,7 +26,9 @@ export function createStringifySafeWithLimits(limits: {|
     maxArrayLimit = Number.POSITIVE_INFINITY,
     maxObjectKeysLimit = Number.POSITIVE_INFINITY,
   } = limits;
-  const stack = [];
+  const stack: Array<
+    string | {+[string]: mixed} | {'...(truncated keys)...': number},
+  > = [];
   /* $FlowFixMe[missing-this-annot] The 'this' type annotation(s) required by
    * Flow's LTI update could not be added via codemod */
   function replacer(key: string, value: mixed): mixed {

packages/hermes-inspector-msggen/src/Graph.js

@@ -63,7 +63,7 @@ export class Graph {
       root.children.add(node);
     }
 
-    const output = [];
+    const output: Array<NodeId> = [];
     postorder(root, output);
 
     // remove fake root node

packages/hermes-inspector-msggen/src/index.js

@@ -44,9 +44,9 @@ function parseDomains(
   includeExperimental: Set<string>,
 ): Descriptor {
   const desc = {
-    types: [],
-    commands: [],
-    events: [],
+    types: ([]: Array<Type>),
+    commands: ([]: Array<Command>),
+    events: ([]: Array<Event>),
   };
 
   for (const obj of domainObjs) {

packages/rn-tester/js/examples/XHR/XHRExampleFetch.js

@@ -44,7 +44,7 @@ class XHRExampleFetch extends React.Component<any, any> {
       return null;
     }
 
-    const responseHeaders = [];
+    const responseHeaders: Array<React.Node> = [];
     const keys = Object.keys(this.responseHeaders.map);
     for (let i = 0; i < keys.length; i++) {
       const key = keys[i];