Fix build-types script, align internal babel-register (#49133)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49133

Follow up to D68960540.

Changelog: [Internal]

Reviewed By: robhogan

Differential Revision: D69053411

fbshipit-source-id: ffc8aba923aab8f4cd0d74fb61c49893ff09b6c1

scripts/babel-register.js

@@ -16,7 +16,6 @@ const {
 } = require('./consts');
 
 let isRegisteredForMonorepo = false;
-let isRegisteredForScriptsDir = false;
 
 /**
  * Calling this function enables all Node.js packages to run from source when
@@ -44,6 +43,7 @@ function registerForMonorepo() {
   } else {
     require('metro-babel-register')([
       PACKAGES_DIR,
+      SCRIPTS_DIR,
       RN_INTEGRATION_TESTS_RUNNER_DIR,
     ]);
   }
@@ -60,13 +60,7 @@ function registerForMonorepo() {
  * ```
  */
 function registerForScript() {
-  if (isRegisteredForScriptsDir) {
-    return;
-  }
-
-  require('metro-babel-register')([SCRIPTS_DIR]);
-
-  isRegisteredForScriptsDir = true;
+  registerForMonorepo();
 }
 
 module.exports = {

scripts/build/build-types.js

@@ -104,11 +104,11 @@ async function main() {
   );
 }
 
-function getPackageName(file: string): string {
+function getPackageName(file /*: string */) /*: string */ {
   return path.relative(PACKAGES_DIR, file).split(path.sep)[0];
 }
 
-function getBuildPath(file: string): string {
+function getBuildPath(file /*: string */) /*: string */ {
   const packageDir = path.join(PACKAGES_DIR, getPackageName(file));
 
   return path.join(
@@ -120,9 +120,9 @@ function getBuildPath(file: string): string {
   );
 }
 
-function ignoreShadowedFiles(files: Array<string>): Array<string> {
-  const shadowedPrefixes: Record<string, boolean> = {};
-  const result: Array<string> = [];
+function ignoreShadowedFiles(files /*: Array<string> */) /*: Array<string> */ {
+  const shadowedPrefixes /*: Record<string, boolean> */ = {};
+  const result /*: Array<string> */ = [];
 
   // Find all flow definition files that shadow other files
   for (const file of files) {

scripts/build/config.js

@@ -9,8 +9,6 @@
  * @oncall react_native
  */
 
-require('../babel-register').registerForScript();
-
 import type {BabelCoreOptions} from '@babel/core';
 
 const {ModuleResolutionKind} = require('typescript');