Make functions async and add await to prepare for prettier v3 upgrade: 6/n (#52770)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52770

Prettier v3 has an async API. This diff adds in async and await ahead of the upgrade to prepare for the API change.

Changelog: [Internal]

Reviewed By: pieterv

Differential Revision: D78752906

fbshipit-source-id: 2deeecfc283be30fd0840b2a089604f4e6804af5

packages/react-native-codegen/scripts/build.js

@@ -58,7 +58,7 @@ function getBuildPath(file, buildFolder) {
   return path.resolve(pkgBuildPath, relativeToSrcPath);
 }
 
-function buildFile(file, silent) {
+async function buildFile(file, silent) {
   const destPath = getBuildPath(file, BUILD_DIR);
 
   fs.mkdirSync(path.dirname(destPath), {recursive: true});
@@ -82,7 +82,7 @@ function buildFile(file, silent) {
           '\n',
       );
   } else {
-    const transformed = prettier.format(
+    const transformed = await prettier.format(
       babel.transformFileSync(file, {}).code,
       {
         ...prettierConfig,
@@ -111,6 +111,8 @@ const files = glob.sync(pattern, {nodir: true});
 
 process.stdout.write(fixedWidth(`${path.basename(PACKAGE_DIR)}\n`));
 
-files.forEach(file => buildFile(file, !process.argv.includes('--verbose')));
-
-process.stdout.write(`[  ${styleText('green', 'OK')}  ]\n`);
+Promise.all(
+  files.map(file => buildFile(file, !process.argv.includes('--verbose'))),
+).then(() => {
+  process.stdout.write(`[  ${styleText('green', 'OK')}  ]\n`);
+});