fix(@angular-devkit/build-angular): ensure source locale data is injected when localizing

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

@@ -202,40 +202,46 @@ export async function configureI18nBuild<T extends BrowserBuilderSchema | Server
     const loader = await createTranslationLoader();
     const usedFormats = new Set<string>();
     for (const [locale, desc] of Object.entries(i18n.locales)) {
-      if (i18n.inlineLocales.has(locale) && desc.file) {
-        const result = loader(path.join(context.workspaceRoot, desc.file));
-
-        for (const diagnostics of result.diagnostics.messages) {
-          if (diagnostics.type === 'error') {
-            throw new Error(
-              `Error parsing translation file '${desc.file}': ${diagnostics.message}`,
-            );
-          } else {
-            context.logger.warn(`WARNING [${desc.file}]: ${diagnostics.message}`);
-          }
-        }
+      if (!i18n.inlineLocales.has(locale)) {
+        continue;
+      }
 
-        usedFormats.add(result.format);
-        if (usedFormats.size > 1 && tsConfig.options.enableI18nLegacyMessageIdFormat !== false) {
-          // This limitation is only for legacy message id support (defaults to true as of 9.0)
-          throw new Error(
-            'Localization currently only supports using one type of translation file format for the entire application.',
-          );
-        }
+      const localeDataPath = findLocaleDataPath(locale, localeDataBasePath);
+      if (!localeDataPath) {
+        context.logger.warn(
+          `Locale data for '${locale}' cannot be found.  No locale data will be included for this locale.`,
+        );
+      } else {
+        desc.dataPath = localeDataPath;
+      }
 
-        desc.format = result.format;
-        desc.translation = result.translation;
-        desc.integrity = result.integrity;
+      if (!desc.file) {
+        continue;
+      }
+
+      const result = loader(path.join(context.workspaceRoot, desc.file));
 
-        const localeDataPath = findLocaleDataPath(locale, localeDataBasePath);
-        if (!localeDataPath) {
-          context.logger.warn(
-            `Locale data for '${locale}' cannot be found.  No locale data will be included for this locale.`,
+      for (const diagnostics of result.diagnostics.messages) {
+        if (diagnostics.type === 'error') {
+          throw new Error(
+            `Error parsing translation file '${desc.file}': ${diagnostics.message}`,
           );
         } else {
-          desc.dataPath = localeDataPath;
+          context.logger.warn(`WARNING [${desc.file}]: ${diagnostics.message}`);
         }
       }
+
+      usedFormats.add(result.format);
+      if (usedFormats.size > 1 && tsConfig.options.enableI18nLegacyMessageIdFormat !== false) {
+        // This limitation is only for legacy message id support (defaults to true as of 9.0)
+        throw new Error(
+          'Localization currently only supports using one type of translation file format for the entire application.',
+        );
+      }
+
+      desc.format = result.format;
+      desc.translation = result.translation;
+      desc.integrity = result.integrity;
     }
 
     // Legacy message id's require the format of the translations

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

@@ -0,0 +1,46 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import { expectFileToMatch } from '../../utils/fs';
+import { ng } from '../../utils/process';
+import { updateJsonFile } from '../../utils/project';
+import { externalServer, langTranslations, setupI18nConfig } from './legacy';
+
+export default async function() {
+  // Setup i18n tests and config.
+  await setupI18nConfig(true);
+
+  // Update angular.json
+  await updateJsonFile('angular.json', workspaceJson => {
+    const appProject = workspaceJson.projects['test-project'];
+    // tslint:disable-next-line: no-any
+    const i18n: Record<string, any> = appProject.i18n;
+
+    i18n.sourceLocale = 'fr';
+
+    delete i18n.locales['fr'];
+  });
+
+  // Build each locale and verify the output.
+  await ng('build');
+  for (const { lang, outputPath } of langTranslations) {
+    // does not exist in this test due to the source locale change
+    if (lang === 'en-US') {
+      continue;
+    }
+
+    await expectFileToMatch(`${outputPath}/vendor-es5.js`, lang);
+    await expectFileToMatch(`${outputPath}/vendor-es2015.js`, lang);
+
+    // Verify the locale data is registered using the global files
+    await expectFileToMatch(`${outputPath}/vendor-es5.js`, '.ng.common.locales');
+    await expectFileToMatch(`${outputPath}/vendor-es2015.js`, '.ng.common.locales');
+
+    // Verify the HTML lang attribute is present
+    await expectFileToMatch(`${outputPath}/index.html`, `lang="${lang}"`);
+  }
+}