fix(@angular-devkit/build-angular): several windows fixes to application builder prerendering

This commit fixes several Windows issues in the prerendering pipeline. Primarily due to path normalization and other Windows only constraints.

(cherry picked from commit 48963fc)

Author: alan-agius4

packages/angular_devkit/build_angular/src/utils/server-rendering/esm-in-memory-file-loader.ts

@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import { join } from 'node:path';
+import { join, relative } from 'node:path';
+import { pathToFileURL } from 'node:url';
 import { workerData } from 'node:worker_threads';
 import { fileURLToPath } from 'url';
 import { JavaScriptTransformer } from '../../tools/esbuild/javascript-transformer';
@@ -23,7 +24,7 @@ const { outputFiles, workspaceRoot } = workerData as {
 
 const TRANSFORMED_FILES: Record<string, string> = {};
 const CHUNKS_REGEXP = /file:\/\/\/(main\.server|chunk-\w+)\.mjs/;
-const WORKSPACE_ROOT_FILE = new URL(join(workspaceRoot, 'index.mjs'), 'file:').href;
+const WORKSPACE_ROOT_FILE = pathToFileURL(join(workspaceRoot, 'index.mjs')).href;
 
 const JAVASCRIPT_TRANSFORMER = new JavaScriptTransformer(
   // Always enable JIT linking to support applications built with and without AOT.
@@ -44,7 +45,9 @@ export function resolve(
       return {
         format: 'module',
         shortCircuit: true,
-        url: new URL(normalizedSpecifier, 'file:').href,
+        // File URLs need to absolute. In Windows these also need to include the drive.
+        // The `/` will be resolved to the drive letter.
+        url: pathToFileURL('/' + normalizedSpecifier).href,
       };
     }
   }
@@ -60,8 +63,8 @@ export function resolve(
 export async function load(url: string, context: { format?: string | null }, nextLoad: Function) {
   if (isFileProtocol(url)) {
     const filePath = fileURLToPath(url);
-    let source =
-      outputFiles[filePath.slice(1)] /* Remove leading slash */ ?? TRANSFORMED_FILES[filePath];
+    // Remove '/' or drive letter for Windows that was added in the above 'resolve'.
+    let source = outputFiles[relative('/', filePath)] ?? TRANSFORMED_FILES[filePath];
 
     if (source === undefined) {
       source = TRANSFORMED_FILES[filePath] = Buffer.from(

packages/angular_devkit/build_angular/src/utils/server-rendering/prerender.ts

@@ -8,7 +8,8 @@
 
 import { OutputFile } from 'esbuild';
 import { readFile } from 'node:fs/promises';
-import { extname, posix } from 'node:path';
+import { extname, join, posix } from 'node:path';
+import { pathToFileURL } from 'node:url';
 import Piscina from 'piscina';
 import type { RenderResult, ServerContext } from './render-page';
 import type { WorkerData } from './render-worker';
@@ -61,7 +62,7 @@ export async function prerenderPages(
     execArgv: [
       '--no-warnings', // Suppress `ExperimentalWarning: Custom ESM Loaders is an experimental feature...`.
       '--loader',
-      require.resolve('./esm-in-memory-file-loader.js'),
+      pathToFileURL(join(__dirname, 'esm-in-memory-file-loader.js')).href, // Loader cannot be an absolute path on Windows.
     ],
   });