Create emitStringProp function (#37527)

Summary:
> Create a function emitStringProp(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#L45-L51) and [TypeScript](https://github.com/facebook/react-native/blob/d8ced6f8953cd896471983714e722caf50783960/packages/react-native-codegen/src/parsers/typescript/components/events.js#L57-L61) into that function. Use that function in the original call site.

bypass-github-export-checks

## Changelog:

[INTERNAL][ADDED] - emitStringProp in parser-primitves

Pull Request resolved: #37527

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

Reviewed By: cortinico

Differential Revision: D46144200

Pulled By: cipolleschi

fbshipit-source-id: 076b530905ba7c28cfb2151e29e589026010c3c3

Author: cloudpresser

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

@@ -34,6 +34,7 @@ const {
   typeAliasResolution,
   typeEnumResolution,
   Visitor,
+  emitStringProp,
 } = require('../parsers-primitives.js');
 const {MockedParser} = require('../parserMock');
 const {emitUnion} = require('../parsers-primitives');
@@ -149,6 +150,38 @@ describe('emitRootTag', () => {
   });
 });
 
+describe('emitStringProp', () => {
+  describe('when optional is true', () => {
+    it('returns optional StringTypeAnnotation', () => {
+      const result = emitStringProp('myProp', true);
+      const expected = {
+        name: 'myProp',
+        optional: true,
+        typeAnnotation: {
+          type: 'StringTypeAnnotation',
+        },
+      };
+
+      expect(result).toEqual(expected);
+    });
+  });
+
+  describe('when nullable is false', () => {
+    it('returns required StringTypeAnnotatio', () => {
+      const result = emitStringProp('myProp', false);
+      const expected = {
+        name: 'myProp',
+        optional: false,
+        typeAnnotation: {
+          type: 'StringTypeAnnotation',
+        },
+      };
+
+      expect(result).toEqual(expected);
+    });
+  });
+});
+
 describe('emitStringish', () => {
   describe('when nullable is true', () => {
     it('returns nullable type annotation', () => {

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

@@ -23,7 +23,7 @@ const {
   throwIfArgumentPropsAreNull,
 } = require('../../error-utils');
 const {getEventArgument} = require('../../parsers-commons');
-const {emitBoolProp} = require('../../parsers-primitives');
+const {emitBoolProp, emitStringProp} = require('../../parsers-primitives');
 
 function getPropertyType(
   /* $FlowFixMe[missing-local-annot] The type annotation(s) required by Flow's
@@ -39,13 +39,7 @@ function getPropertyType(
     case 'BooleanTypeAnnotation':
       return emitBoolProp(name, optional);
     case 'StringTypeAnnotation':
-      return {
-        name,
-        optional,
-        typeAnnotation: {
-          type: 'StringTypeAnnotation',
-        },
-      };
+      return emitStringProp(name, optional);
     case 'Int32':
       return {
         name,

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

@@ -150,6 +150,19 @@ function emitString(nullable: boolean): Nullable<StringTypeAnnotation> {
   });
 }
 
+function emitStringProp(
+  name: string,
+  optional: boolean,
+): NamedShape<StringTypeAnnotation> {
+  return {
+    name,
+    optional,
+    typeAnnotation: {
+      type: 'StringTypeAnnotation',
+    },
+  };
+}
+
 function typeAliasResolution(
   typeResolution: TypeResolutionStatus,
   objectTypeAnnotation: ObjectTypeAnnotation<
@@ -609,6 +622,7 @@ module.exports = {
   emitVoid,
   emitString,
   emitStringish,
+  emitStringProp,
   emitMixed,
   emitUnion,
   emitPartial,

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

@@ -25,7 +25,7 @@ const {
   throwIfArgumentPropsAreNull,
 } = require('../../error-utils');
 const {getEventArgument} = require('../../parsers-commons');
-const {emitBoolProp} = require('../../parsers-primitives');
+const {emitBoolProp, emitStringProp} = require('../../parsers-primitives');
 
 function getPropertyType(
   /* $FlowFixMe[missing-local-annot] The type annotation(s) required by Flow's
@@ -49,13 +49,7 @@ function getPropertyType(
     case 'TSBooleanKeyword':
       return emitBoolProp(name, optional);
     case 'TSStringKeyword':
-      return {
-        name,
-        optional,
-        typeAnnotation: {
-          type: 'StringTypeAnnotation',
-        },
-      };
+      return emitStringProp(name, optional);
     case 'Int32':
       return {
         name,