fix(@angular-devkit/build-angular): avoid marking component styles as media with no output media directory

The logic to detect media output files was previously predicated on the presence of a media subdirectory
being defined. Prior to the ability to customize output path subcomponents there was a guaranteed media
subdirectory. However, now that customization is possible, there is the potential for media files to
not have a distinct subdirectory in the output. To facilitate output media detection in this scenario
a file extension based method is now employed. This avoids a dependence on output directory structure.

Author: clydin

packages/angular_devkit/build_angular/src/builders/application/tests/options/output-path_spec.ts

@@ -11,8 +11,11 @@ import { APPLICATION_BUILDER_INFO, BASE_OPTIONS, describeBuilder } from '../setu
 
 describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
   beforeEach(async () => {
-    // Add a media file
+    // Add a global stylesheet media file
     await harness.writeFile('src/styles.css', `h1 { background: url('./spectrum.png')}`);
+    // Add a component stylesheet media file
+    await harness.writeFile('src/app/abc.svg', '');
+    await harness.writeFile('src/app/app.component.css', `h2 { background: url('./abc.svg')}`);
 
     // Enable SSR
     await harness.modifyFile('src/tsconfig.app.json', (content) => {
@@ -23,10 +26,9 @@ describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
       return JSON.stringify(tsConfig);
     });
 
-    // Application code is not needed in this test
+    // Application server code is not needed in this test
     await harness.writeFile('src/main.server.ts', `console.log('Hello!');`);
     await harness.writeFile('src/server.ts', `console.log('Hello!');`);
-    await harness.writeFile('src/main.ts', `console.log('Hello!');`);
   });
 
   describe('Option: "outputPath"', () => {
@@ -56,6 +58,7 @@ describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
         expect(result?.success).toBeTrue();
 
         harness.expectFile('dist/browser/media/spectrum.png').toExist();
+        harness.expectFile('dist/browser/media/abc.svg').toExist();
       });
 
       it(`should emit server bundles in 'server' directory`, async () => {
@@ -96,6 +99,50 @@ describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
           expect(result?.success).toBeTrue();
 
           harness.expectFile('dist/browser/resource/spectrum.png').toExist();
+          harness.expectFile('dist/browser/resource/abc.svg').toExist();
+        });
+
+        it(`should emit server bundles in 'server' directory`, async () => {
+          const { result } = await harness.executeOnce();
+          expect(result?.success).toBeTrue();
+
+          harness.expectFile('dist/server/server.mjs').toExist();
+        });
+      });
+
+      describe(`'media' is set to ''`, () => {
+        beforeEach(() => {
+          harness.useTarget('build', {
+            ...BASE_OPTIONS,
+            polyfills: [],
+            styles: ['src/styles.css'],
+            server: 'src/main.server.ts',
+            outputPath: {
+              base: 'dist',
+              media: '',
+            },
+            ssr: {
+              entry: 'src/server.ts',
+            },
+          });
+        });
+
+        it(`should emit browser bundles in 'browser' directory`, async () => {
+          const { result } = await harness.executeOnce();
+          expect(result?.success).toBeTrue();
+
+          harness.expectFile('dist/browser/main.js').toExist();
+        });
+
+        it(`should emit media files in 'browser' directory`, async () => {
+          const { result } = await harness.executeOnce();
+          expect(result?.success).toBeTrue();
+
+          harness.expectFile('dist/browser/spectrum.png').toExist();
+          harness.expectFile('dist/browser/abc.svg').toExist();
+
+          // Component CSS should not be considered media
+          harness.expectFile('dist/browser/app.component.css').toNotExist();
         });
 
         it(`should emit server bundles in 'server' directory`, async () => {
@@ -135,6 +182,7 @@ describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
           expect(result?.success).toBeTrue();
 
           harness.expectFile('dist/browser/media/spectrum.png').toExist();
+          harness.expectFile('dist/browser/media/abc.svg').toExist();
         });
 
         it(`should emit server bundles in 'node-server' directory`, async () => {
@@ -174,6 +222,7 @@ describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
           expect(result?.success).toBeTrue();
 
           harness.expectFile('dist/public/media/spectrum.png').toExist();
+          harness.expectFile('dist/public/media/abc.svg').toExist();
         });
 
         it(`should emit server bundles in 'server' directory`, async () => {
@@ -220,6 +269,7 @@ describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
           expect(result?.success).toBeTrue();
 
           harness.expectFile('dist/media/spectrum.png').toExist();
+          harness.expectFile('dist/media/abc.svg').toExist();
         });
 
         it(`should error when ssr is enabled`, async () => {
@@ -273,6 +323,7 @@ describeBuilder(buildApplication, APPLICATION_BUILDER_INFO, (harness) => {
           expect(result?.success).toBeTrue();
 
           harness.expectFile('dist/browser/media/spectrum.png').toExist();
+          harness.expectFile('dist/browser/media/abc.svg').toExist();
         });
 
         it(`should emit server bundles in '' directory`, async () => {

packages/angular_devkit/build_angular/src/tools/esbuild/bundler-context.ts

@@ -352,11 +352,10 @@ export class BundlerContext {
 
     assert(this.#esbuildOptions, 'esbuild options cannot be undefined.');
 
-    const { assetNames = '' } = this.#esbuildOptions;
-    const mediaDirname = dirname(assetNames);
     const outputFiles = result.outputFiles.map((file) => {
       let fileType: BuildOutputFileType;
-      if (dirname(file.path) === mediaDirname) {
+      // All files that are not JS, CSS, WASM, or sourcemaps for them are considered media
+      if (!/\.([cm]?js|css|wasm)(\.map)?$/i.test(file.path)) {
         fileType = BuildOutputFileType.Media;
       } else {
         fileType = this.#platformIsServer