fix(@angular/build): resolve Angular locale data namespace in esbuild

A transient error can occur during 'ng serve' when Vite's dependency pre-bundling is triggered for Angular locale data, showing an error like '[vite] (ssr) Error when evaluating SSR module...: There is a new version of the pre-bundle...'.

Previously, the 'angular:locale/data:' namespace was left unresolved by the build process for the dev server. This caused Vite to treat the namespace as a new dependency, triggering a pre-bundling step that led to the error.

With this change, esbuild now resolves the 'angular:locale/data:' namespace and replaces it with the direct module import path. While the module is still treated as an external dependency, providing the explicit path prevents Vite from unnecessarily triggering a new pre-bundling phase. This resolves the transient error.

Closes #31498

Author: alan-agius4

packages/angular/build/src/builders/dev-server/vite/server.ts

@@ -12,7 +12,6 @@ import type { Connect, InlineConfig, SSROptions, ServerOptions } from 'vite';
 import type { ComponentStyleRecord } from '../../../tools/vite/middlewares';
 import {
   ServerSsrMode,
-  createAngularLocaleDataPlugin,
   createAngularMemoryPlugin,
   createAngularSetupMiddlewaresPlugin,
   createAngularSsrTransformPlugin,
@@ -221,7 +220,6 @@ export async function setupServer(
       define,
     ),
     plugins: [
-      createAngularLocaleDataPlugin(),
       createAngularSetupMiddlewaresPlugin({
         outputFiles,
         assets,

packages/angular/build/src/tools/esbuild/i18n-locale-plugin.ts

@@ -27,17 +27,6 @@ export function createAngularLocaleDataPlugin(): Plugin {
   return {
     name: 'angular-locale-data',
     setup(build): void {
-      // If packages are configured to be external then leave the original angular locale import path.
-      // This happens when using the development server with caching enabled to allow Vite prebundling to work.
-      // There currently is no option on the esbuild resolve function to resolve while disabling the option. To
-      // workaround the inability to resolve the full locale location here, the Vite dev server prebundling also
-      // contains a plugin to allow the locales to be correctly resolved when prebundling.
-      // NOTE: If esbuild eventually allows controlling the external package options in a build.resolve call, this
-      //       workaround can be removed.
-      if (build.initialOptions.packages === 'external') {
-        return;
-      }
-
       build.onResolve({ filter: /^angular:locale\/data:/ }, async ({ path }) => {
         // Extract the locale from the path
         const rawLocaleTag = path.split(':', 3)[2];

packages/angular/build/src/tools/vite/plugins/i18n-locale-plugin.ts

@@ -7,7 +7,6 @@
  */
 
 export { createAngularMemoryPlugin } from './angular-memory-plugin';
-export { createAngularLocaleDataPlugin } from './i18n-locale-plugin';
 export { createRemoveIdPrefixPlugin } from './id-prefix-plugin';
 export { createAngularSetupMiddlewaresPlugin, ServerSsrMode } from './setup-middlewares-plugin';
 export { createAngularSsrTransformPlugin } from './ssr-transform-plugin';