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fix(@angular/build): externalize Angular dependencies in Vitest runner #31600

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merged 1 commit into from
Oct 25, 2025
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fix(@angular/build): externalize Angular dependencies in Vitest runner #31600

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22 changes: 21 additions & 1 deletion packages/angular/build/src/builders/unit-test/runners/vitest/build-options.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,21 @@ import { NormalizedUnitTestBuilderOptions, injectTestingPolyfills } from '../../
import { findTests, getTestEntrypoints } from '../../test-discovery';
import { RunnerOptions } from '../api';

/**
* A list of Angular related packages that should be marked as external.
* This allows Vite to pre-bundle them, improving performance.
*/
const ANGULAR_PACKAGES_TO_EXTERNALIZE = [
'@angular/core',
'@angular/common',
'@angular/platform-browser',
'@angular/compiler',
'@angular/router',
'@angular/forms',
'@angular/animations',
'rxjs',
];

function createTestBedInitVirtualFile(
providersFile: string | undefined,
projectSourceRoot: string,
Expand Down Expand Up @@ -83,6 +98,11 @@ export async function getVitestBuildOptions(
});
entryPoints.set('init-testbed', 'angular:test-bed-init');

const externalDependencies = new Set(['vitest', ...ANGULAR_PACKAGES_TO_EXTERNALIZE]);
if (baseBuildOptions.externalDependencies) {
baseBuildOptions.externalDependencies.forEach((dep) => externalDependencies.add(dep));
}

const buildOptions: Partial<ApplicationBuilderInternalOptions> = {
...baseBuildOptions,
watch,
Expand All @@ -101,7 +121,7 @@ export async function getVitestBuildOptions(
outputHashing: adjustOutputHashing(baseBuildOptions.outputHashing),
optimization: false,
entryPoints,
externalDependencies: ['vitest', '@vitest/browser/context'],
externalDependencies: [...externalDependencies],
};

buildOptions.polyfills = injectTestingPolyfills(buildOptions.polyfills);
Expand Down