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fix(@angular/build): serve extensionless assets without transformation #32561

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alan-agius4 merged 2 commits into from
Feb 24, 2026
+22 −2
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fix(@angular/build): serve extensionless assets without transformation #32561

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76708a1
fix(@angular/build): serve extensionless assets without transformation
alan-agius4 Feb 24, 2026
81a015b
fixup! fix(@angular/build): serve extensionless assets without transf…
alan-agius4 Feb 24, 2026
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20 changes: 20 additions & 0 deletions packages/angular/build/src/builders/dev-server/tests/behavior/build-assets_spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,26 @@ describeServeBuilder(executeDevServer, DEV_SERVER_BUILDER_INFO, (harness, setupT
"import {foo} from 'unresolved'; /* a comment */const foo = `bar`;\n\n\n";

describe('Behavior: "browser builder assets"', () => {
it('serves a project extensionless asset unmodified', async () => {
await harness.writeFile('src/extensionless', javascriptFileContent);

setupTarget(harness, {
assets: ['src/extensionless'],
optimization: {
scripts: true,
},
});

harness.useTarget('serve', {
...BASE_OPTIONS,
});

const { result, response } = await executeOnceAndFetch(harness, 'extensionless');

expect(result?.success).toBeTrue();
expect(await response?.text()).toContain(javascriptFileContent);
});

it('serves a project JavaScript asset unmodified', async () => {
await harness.writeFile('src/extra.js', javascriptFileContent);

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4 changes: 2 additions & 2 deletions packages/angular/build/src/tools/vite/middlewares/assets-middleware.ts
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Expand Up @@ -45,8 +45,8 @@ export function createAngularAssetsMiddleware(
// Rewrite all build assets to a vite raw fs URL
const asset = assets.get(pathname);
if (asset) {
// This is a workaround to serve CSS, JS and TS files without Vite transformations.
if (JS_TS_REGEXP.test(extension) || CSS_PREPROCESSOR_REGEXP.test(extension)) {
// This is a workaround to serve extensionless, CSS, JS and TS files without Vite transformations.
if (!extension || JS_TS_REGEXP.test(extension) || CSS_PREPROCESSOR_REGEXP.test(extension)) {
const contents = readFileSync(asset.source);
const etag = `W/${createHash('sha256').update(contents).digest('hex')}`;
if (checkAndHandleEtag(req, res, etag)) {
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