Create emitInt32Prop function (#37663)

Summary:
Create a function emitInt32Prop(name: string, optional: boolean) in parser-primitives.js. Factor out the code from [Flow](https://github.com/facebook/react-native/blob/d8ced6f8953cd896471983714e722caf50783960/packages/react-native-codegen/src/parsers/flow/components/events.js#L53-L59) and [TypeScript](https://github.com/facebook/react-native/blob/d8ced6f8953cd896471983714e722caf50783960/packages/react-native-codegen/src/parsers/typescript/components/events.js#L63-L69) into that function. Use that function in the original call site.

## Changelog:
[INTERNAL][ADDED] - emitInt32Prop in parser-primitves

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[ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message

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Pull Request resolved: https://github.com/facebook/react-native/pull/37663

Test Plan: `yarn jest packages/react-native-codegen`

Reviewed By: cipolleschi

Differential Revision: D46437495

Pulled By: rshest

fbshipit-source-id: cebe3958c2ad9c4ab9a6c087fee4317b5e57bc58

packages/react-native-codegen/src/parsers/__tests__/parsers-primitives-test.js

@@ -27,6 +27,7 @@ const {
   emitFloatProp,
   emitNumber,
   emitInt32,
+  emitInt32Prop,
   emitGenericObject,
   emitObject,
   emitPromise,
@@ -104,6 +105,38 @@ describe('emitInt32', () => {
   });
 });
 
+describe('emitInt32Prop', () => {
+  describe('when optional is true', () => {
+    it('returns optional Int32TypeAnnotation', () => {
+      const result = emitInt32Prop('myProp', true);
+      const expected = {
+        name: 'myProp',
+        optional: true,
+        typeAnnotation: {
+          type: 'Int32TypeAnnotation',
+        },
+      };
+
+      expect(result).toEqual(expected);
+    });
+  });
+
+  describe('when nullable is false', () => {
+    it('returns required Int32TypeAnnotation', () => {
+      const result = emitInt32Prop('myProp', false);
+      const expected = {
+        name: 'myProp',
+        optional: false,
+        typeAnnotation: {
+          type: 'Int32TypeAnnotation',
+        },
+      };
+
+      expect(result).toEqual(expected);
+    });
+  });
+});
+
 describe('emitNumber', () => {
   describe('when nullable is true', () => {
     it('returns nullable type annotation', () => {

packages/react-native-codegen/src/parsers/flow/components/events.js

@@ -28,6 +28,7 @@ const {
   emitDoubleProp,
   emitFloatProp,
   emitStringProp,
+  emitInt32Prop,
 } = require('../../parsers-primitives');
 
 function getPropertyType(
@@ -46,13 +47,7 @@ function getPropertyType(
     case 'StringTypeAnnotation':
       return emitStringProp(name, optional);
     case 'Int32':
-      return {
-        name,
-        optional,
-        typeAnnotation: {
-          type: 'Int32TypeAnnotation',
-        },
-      };
+      return emitInt32Prop(name, optional);
     case 'Double':
       return emitDoubleProp(name, optional);
     case 'Float':

packages/react-native-codegen/src/parsers/parsers-primitives.js

@@ -76,6 +76,19 @@ function emitInt32(nullable: boolean): Nullable<Int32TypeAnnotation> {
   });
 }
 
+function emitInt32Prop(
+  name: string,
+  optional: boolean,
+): NamedShape<Int32TypeAnnotation> {
+  return {
+    name,
+    optional,
+    typeAnnotation: {
+      type: 'Int32TypeAnnotation',
+    },
+  };
+}
+
 function emitNumber(
   nullable: boolean,
 ): Nullable<NativeModuleNumberTypeAnnotation> {
@@ -641,6 +654,7 @@ module.exports = {
   emitFloatProp,
   emitFunction,
   emitInt32,
+  emitInt32Prop,
   emitNumber,
   emitGenericObject,
   emitDictionary,

packages/react-native-codegen/src/parsers/typescript/components/events.js

@@ -30,6 +30,7 @@ const {
   emitDoubleProp,
   emitFloatProp,
   emitStringProp,
+  emitInt32Prop,
 } = require('../../parsers-primitives');
 function getPropertyType(
   /* $FlowFixMe[missing-local-annot] The type annotation(s) required by Flow's
@@ -55,13 +56,7 @@ function getPropertyType(
     case 'TSStringKeyword':
       return emitStringProp(name, optional);
     case 'Int32':
-      return {
-        name,
-        optional,
-        typeAnnotation: {
-          type: 'Int32TypeAnnotation',
-        },
-      };
+      return emitInt32Prop(name, optional);
     case 'Double':
       return emitDoubleProp(name, optional);
     case 'Float':