fix(@angular/build): support reading on-disk files during i18n extraction

If an application has JavaScript files that are sourced directly from disk,
the extraction would previously fail due to the i18n extractor only able
to access the in-memory generated JavaScript files. The extractor can now
access both memory and disk-based JavaScript files.

(cherry picked from commit 6b544f7)

Author: clydin

packages/angular/build/src/builders/extract-i18n/application-extraction.ts

@@ -9,6 +9,7 @@
 import type { ɵParsedMessage as LocalizeMessage } from '@angular/localize';
 import type { MessageExtractor } from '@angular/localize/tools';
 import type { BuilderContext } from '@angular-devkit/architect';
+import { readFileSync } from 'node:fs';
 import nodePath from 'node:path';
 import { buildApplicationInternal } from '../application';
 import type {
@@ -101,6 +102,8 @@ function setupLocalizeExtractor(
       let content;
       if (file?.origin === 'memory') {
         content = textDecoder.decode(file.contents);
+      } else if (file?.origin === 'disk') {
+        content = readFileSync(file.inputPath, 'utf-8');
       }
       if (content === undefined) {
         throw new Error('Unknown file requested: ' + requestedPath);

packages/angular_devkit/build_angular/src/builders/extract-i18n/application-extraction.ts

@@ -11,6 +11,7 @@ import { ResultFile, ResultKind, buildApplicationInternal } from '@angular/build
 import type { ɵParsedMessage as LocalizeMessage } from '@angular/localize';
 import type { MessageExtractor } from '@angular/localize/tools';
 import type { BuilderContext } from '@angular-devkit/architect';
+import { readFileSync } from 'node:fs';
 import nodePath from 'node:path';
 import { BrowserBuilderOptions, convertBrowserOptions } from '../browser-esbuild';
 import type { NormalizedExtractI18nOptions } from './options';
@@ -106,6 +107,8 @@ function setupLocalizeExtractor(
       let content;
       if (file?.origin === 'memory') {
         content = textDecoder.decode(file.contents);
+      } else if (file?.origin === 'disk') {
+        content = readFileSync(file.inputPath, 'utf-8');
       }
       if (content === undefined) {
         throw new Error('Unknown file requested: ' + requestedPath);