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fix(@angular/build): Proper shutdown of esbuild workers #33202

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fix(@angular/build): Proper shutdown of esbuild workers #33202

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5 changes: 4 additions & 1 deletion packages/angular/build/src/builders/application/build-action.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
import { BuilderContext } from '@angular-devkit/architect';
import { existsSync } from 'node:fs';
import path from 'node:path';
import { shutdownEsbuild } from '../../tools/esbuild/bundler-context';
import { ExecutionResult, RebuildState } from '../../tools/esbuild/bundler-execution-result';
import { BuildOutputFile, BuildOutputFileType } from '../../tools/esbuild/bundler-files';
import { shutdownSassWorkerPool } from '../../tools/esbuild/stylesheets/sass-language';
Expand Down Expand Up @@ -89,9 +90,10 @@ export async function* runEsBuildBuildAction(
// Log all diagnostic (error/warning/logs) messages
await logMessages(logger, result, colors, jsonLogs);
} finally {
// Ensure Sass workers are shutdown if not watching
// Ensure workers are shutdown if not watching
if (!watch) {
shutdownSassWorkerPool();
await shutdownEsbuild();
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@gemini-code-assist gemini-code-assist Bot May 14, 2026

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medium

In the non-watch path, result.dispose() is not called. While shutdownEsbuild() stops the shared esbuild process, explicitly disposing the result is consistent with the watch-mode cleanup (line 221) and ensures that any incremental build resources (like the esbuild context) are properly released. Using result?.dispose() is safer in case the build action itself failed.

Suggested change
await shutdownEsbuild();
await Promise.allSettled([result?.dispose(), shutdownEsbuild()]);

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@Aukevanoost Aukevanoost May 14, 2026

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While fair, this will throw an "used before initialized" error since technically, result isn't initialized yet

}
Comment on lines 94 to 97
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@gemini-code-assist gemini-code-assist Bot May 14, 2026

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medium

When watch is enabled, the esbuild and Sass workers are not shut down if an error occurs during the watcher setup (between lines 101 and 163). In this scenario, the first finally block skips the shutdown, and the second finally block (line 221) is never reached because the try block at line 164 is not entered. Consider restructuring the cleanup logic to ensure workers are always shut down when the builder exits, for example by using a single top-level try...finally block for the entire function.

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@Aukevanoost Aukevanoost May 14, 2026

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I could fix this but it feels out-of-scope, I deliberately chose a minimum fix. This would require a bigger refactor

}

Expand Down Expand Up @@ -219,6 +221,7 @@ export async function* runEsBuildBuildAction(
await Promise.allSettled([watcher.close(), result.dispose()]);

shutdownSassWorkerPool();
await shutdownEsbuild();
}
}

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5 changes: 5 additions & 0 deletions packages/angular/build/src/tools/esbuild/bundler-context.ts
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Expand Up @@ -16,6 +16,7 @@ import {
OutputFile,
build,
context,
stop,
} from 'esbuild';
import assert from 'node:assert';
import { builtinModules } from 'node:module';
Expand Down Expand Up @@ -57,6 +58,10 @@ function isEsBuildFailure(value: unknown): value is BuildFailure {
return !!value && typeof value === 'object' && 'errors' in value && 'warnings' in value;
}

export function shutdownEsbuild(): Promise<void> {
return stop();
}

export class BundlerContext {
#esbuildContext?: BuildContext<{ metafile: true; write: false }>;
#esbuildOptions?: BuildOptions & { metafile: true; write: false };
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