fix(@angular-devkit/build-angular): replace fallback locale for en-US

Pre version 14, the locale for `en-US` was `en-US-POSIX`. now in version 14, this has changed to `en-US`.

List of all available locales https://github.com/unicode-org/cldr-json/blob/7033ea9b03aad6ef9cc64057d9cb88fec3fecc53/cldr-json/cldr-core/availableLocales.json#L64

Closes #23334

(cherry picked from commit 1f66ede)

packages/angular_devkit/build_angular/src/utils/i18n-options.ts

@@ -200,14 +200,14 @@ export async function configureI18nBuild<T extends BrowserBuilderSchema | Server
         localeDataPath = findLocaleDataPath(first.toLowerCase(), localeResolver);
         if (localeDataPath) {
           context.logger.warn(
-            `Locale data for '${locale}' cannot be found.  Using locale data for '${first}'.`,
+            `Locale data for '${locale}' cannot be found. Using locale data for '${first}'.`,
           );
         }
       }
     }
     if (!localeDataPath) {
       context.logger.warn(
-        `Locale data for '${locale}' cannot be found.  No locale data will be included for this locale.`,
+        `Locale data for '${locale}' cannot be found. No locale data will be included for this locale.`,
       );
     } else {
       desc.dataPath = localeDataPath;
@@ -268,12 +268,8 @@ function findLocaleDataPath(locale: string, resolver: (locale: string) => string
   try {
     return resolver(scrubbedLocale);
   } catch {
-    if (scrubbedLocale === 'en-US') {
-      // fallback to known existing en-US locale data as of 9.0
-      return findLocaleDataPath('en-US-POSIX', resolver);
-    }
-
-    return null;
+    // fallback to known existing en-US locale data as of 14.0
+    return scrubbedLocale === 'en-US' ? findLocaleDataPath('en', resolver) : null;
   }
 }
 

tests/legacy-cli/e2e/tests/i18n/ivy-localize-es2015.ts

@@ -1,4 +1,4 @@
-import { expectFileNotToExist, expectFileToMatch, readFile, writeFile } from '../../utils/fs';
+import { expectFileNotToExist, expectFileToMatch, readFile } from '../../utils/fs';
 import { ng } from '../../utils/process';
 import { expectToFail } from '../../utils/utils';
 import { externalServer, langTranslations, setupI18nConfig } from './setup';
@@ -7,9 +7,13 @@ export default async function () {
   // Setup i18n tests and config.
   await setupI18nConfig();
 
-  await writeFile('.browserslistrc', 'Chrome 65');
+  const { stderr } = await ng('build', '--source-map');
+  if (/Locale data for .+ cannot be found/.test(stderr)) {
+    throw new Error(
+      `A warning for a locale not found was shown. This should not happen.\n\nSTDERR:\n${stderr}\n`,
+    );
+  }
 
-  await ng('build', '--source-map');
   for (const { lang, outputPath, translation } of langTranslations) {
     await expectFileToMatch(`${outputPath}/main.js`, translation.helloPartial);
     await expectToFail(() => expectFileToMatch(`${outputPath}/main.js`, '$localize`'));

tests/legacy-cli/e2e/tests/i18n/ivy-localize-locale-data.ts

@@ -25,7 +25,7 @@ export default async function () {
   });
 
   const { stderr: err1 } = await ng('build');
-  if (!err1.includes(`Locale data for 'fr-Abcd' cannot be found.  Using locale data for 'fr'.`)) {
+  if (!err1.includes(`Locale data for 'fr-Abcd' cannot be found. Using locale data for 'fr'.`)) {
     throw new Error('locale data fallback warning not shown');
   }