Scope locale selection to bundled languages only (#287)

Author: huntie

front_end/core/i18n/i18n.test.ts

@@ -205,3 +205,16 @@ describe('fetchAndRegisterLocaleData', () => {
         `Actually called with ${fetchStub.args[0][0]}`);
   });
 });
+
+describe('supported locales without a remote base', () => {
+  it('offers only the bundled locales', () => {
+    const locales = i18n.i18n.getAllSupportedDevToolsLocales();
+    assert.includeMembers(locales, ['en-US', 'zh']);
+    assert.notInclude(locales, 'it');
+  });
+
+  it('resolves an unbundled locale to en-US', () => {
+    assert.strictEqual(i18n.i18n.lookupClosestSupportedDevToolsLocale('it-IT'), 'en-US');
+    assert.strictEqual(i18n.i18n.lookupClosestSupportedDevToolsLocale('zh-CN'), 'zh');
+  });
+});

front_end/core/i18n/i18nImpl.ts

@@ -16,7 +16,10 @@ import {
   REMOTE_FETCH_PATTERN,
 } from './locales.js';
 
-const i18nInstance = new I18n.I18n.I18n(LOCALES, DEFAULT_LOCALE);
+// [RN] React Native ships only the bundled locales and has no remoteBase to fetch
+// the rest from, so offer and resolve to the bundled locales only.
+const i18nInstance = new I18n.I18n.I18n(
+    Root.Runtime.getRemoteBase()?.version ? LOCALES : BUNDLED_LOCALES_GENERATED, DEFAULT_LOCALE);
 
 // All the locales that are part of the DevTools bundle and should not be fetched
 // remotely.