Extracted content of the case FunctionTypeAnnotation into emitFunction in parsers-primitives file (#34950)

Summary:
This PR is part of https://github.com/facebook/react-native/issues/34872
This PR extracts the content of the case `FunctionTypeAnnotation` into a single `emitFunction` function inside the parsers-primitives.js file and uses it in both Flow and TypeScript parsers

## Changelog

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[Internal] [Changed] - Extract the content of the case `FunctionTypeAnnotation` into a single `emitFunction` function

Pull Request resolved: https://github.com/facebook/react-native/pull/34950

Test Plan:
Run yarn jest react-native-codegen and ensure CI is green
<img width="984" alt="Screenshot 2022-10-12 at 11 18 54 AM" src="https://user-images.githubusercontent.com/86604753/195260414-136f918f-e4b7-4fcf-b0b9-9142872f3cf9.png">

Reviewed By: christophpurrer

Differential Revision: D40296823

Pulled By: cipolleschi

fbshipit-source-id: 3cac407d260481bd6ae7c3e46642e4c16bba3376

packages/react-native-codegen/src/parsers/flow/modules/index.js

@@ -41,6 +41,7 @@ const {
 const {
   emitBoolean,
   emitDouble,
+  emitFunction,
   emitNumber,
   emitInt32,
   emitObject,
@@ -372,8 +373,7 @@ function translateTypeAnnotation(
       });
     }
     case 'FunctionTypeAnnotation': {
-      return wrapNullable(
-        nullable,
+      const translateFunctionTypeAnnotationValue: NativeModuleFunctionTypeAnnotation =
         translateFunctionTypeAnnotation(
           hasteModuleName,
           typeAnnotation,
@@ -381,8 +381,8 @@ function translateTypeAnnotation(
           aliasMap,
           tryParse,
           cxxOnly,
-        ),
-      );
+        );
+      return emitFunction(nullable, translateFunctionTypeAnnotationValue);
     }
     case 'UnionTypeAnnotation': {
       if (cxxOnly) {

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

@@ -14,6 +14,7 @@ import type {
   Nullable,
   NativeModuleAliasMap,
   NativeModuleBaseTypeAnnotation,
+  NativeModuleFunctionTypeAnnotation,
   NativeModuleTypeAliasTypeAnnotation,
   NativeModuleNumberTypeAnnotation,
   BooleanTypeAnnotation,
@@ -23,8 +24,8 @@ import type {
   ReservedTypeAnnotation,
   ObjectTypeAnnotation,
   NativeModulePromiseTypeAnnotation,
-  VoidTypeAnnotation,
   StringTypeAnnotation,
+  VoidTypeAnnotation,
 } from '../CodegenSchema';
 import type {ParserType} from './errors';
 import type {TypeAliasResolutionStatus} from './utils';
@@ -78,6 +79,12 @@ function emitStringish(nullable: boolean): Nullable<StringTypeAnnotation> {
     type: 'StringTypeAnnotation',
   });
 }
+function emitFunction(
+  nullable: boolean,
+  translateFunctionTypeAnnotationValue: NativeModuleFunctionTypeAnnotation,
+): Nullable<NativeModuleFunctionTypeAnnotation> {
+  return wrapNullable(nullable, translateFunctionTypeAnnotationValue);
+}
 
 function typeAliasResolution(
   typeAliasResolutionStatus: TypeAliasResolutionStatus,
@@ -161,12 +168,13 @@ function emitObject(
 module.exports = {
   emitBoolean,
   emitDouble,
+  emitFunction,
   emitInt32,
   emitNumber,
   emitObject,
   emitPromise,
   emitRootTag,
-  emitVoid,
   emitStringish,
+  emitVoid,
   typeAliasResolution,
 };

packages/react-native-codegen/src/parsers/typescript/modules/index.js

@@ -41,6 +41,7 @@ const {
 const {
   emitBoolean,
   emitDouble,
+  emitFunction,
   emitNumber,
   emitInt32,
   emitObject,
@@ -387,8 +388,7 @@ function translateTypeAnnotation(
       });
     }
     case 'TSFunctionType': {
-      return wrapNullable(
-        nullable,
+      const translateFunctionTypeAnnotationValue: NativeModuleFunctionTypeAnnotation =
         translateFunctionTypeAnnotation(
           hasteModuleName,
           typeAnnotation,
@@ -396,8 +396,9 @@ function translateTypeAnnotation(
           aliasMap,
           tryParse,
           cxxOnly,
-        ),
-      );
+        );
+
+      return emitFunction(nullable, translateFunctionTypeAnnotationValue);
     }
     case 'TSUnionType': {
       if (cxxOnly) {