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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"@angular/build: leaves esbuild service child alive after watch:false build","articleBody":"### Command\n\nbuild\n\n### Is this a regression?\n\n- [ ] Yes, this behavior used to work in the previous version\n\n### The previous version in which this bug was not present was\n\n_No response_\n\n### Description\n\n**Symptom**: After a one-shot ng build (no --watch) completes successfully, the Node process does not exit. `process._getActiveHandles()` shows a ChildProcess for the esbuild service\n```\nall services stopped\nhandles: [ 'WriteStream', 'WriteStream', 'ReadStream', 'ChildProcess' ]\nrequests: []\nchild: {\n  pid: 52715,\n  file: '/my/machine/\u003cproject\u003e/node_modules/.pnpm/@esbuild+linux-x64@0.27.3/node_modules/@esbuild/linux-x64/bin/esbuild',\n  args: [\n    '/my/machine/\u003cproject\u003e/node_modules/.pnpm/@esbuild+linux-x64@0.27.3/node_modules/@esbuild/linux-x64/bin/esbuild',\n    '--service=0.27.3',\n    '--ping'\n  ]\n}\n```\nThe root cause lays in @angular/build/src/builders/application/build-action.js — `runEsBuildBuildAction`:\n\n  - For `watch:false`, `BundlerContext.incremental` is `false`, so the build path uses one-shot `esbuild.build()` and never creates an `esbuild.context()`.\n  - `ExecutionResult.dispose()` → `BundlerContext.dispose()` only awaits `this.#esbuildContext?.dispose()`, which is `undefined` in this path. So nothing tears down esbuild's long-lived\n  service child.\n  - The builder never calls `esbuild.stop()` anywhere.\n  - The plugin teardown registered via `build.onDispose(...)` in compiler-plugin.js (`javascriptTransformer.close(), cacheStore?.close(), compilation.close?.()`) is fire-and-forget\n  (void ...) and scheduled by esbuild via `setTimeout(cb, 0)`, so it can race with the function returning.\n\nThe issue is not apparent in regular builds since the process is exited after the build loop marks `done: true` but builders that decorate over the Angular builder inherit the leakage. \n\n\n### Minimal Reproduction\n\nHere's how we use the internal builder programatically: https://github.com/native-federation/angular-adapter/blob/8bd8b58b7db8ae3cac5818c2d643077a8b3161ce/packages/angular/src/builders/build/builder.ts#L95\n\n### Exception or Error\n\n```text\n\n```\n\n### Your Environment\n\n```text\n\u003e ng version\n\n\n     _                      _                 ____ _     ___\n    / \\   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|\n   / △ \\ | '_ \\ / _` | | | | |/ _` | '__|   | |   | |    | |\n  / ___ \\| | | | (_| | |_| | | (_| | |      | |___| |___ | |\n /_/   \\_\\_| |_|\\__, |\\__,_|_|\\__,_|_|       \\____|_____|___|\n                |___/\n    \n\nAngular CLI       : 21.2.10\nAngular           : 21.2.12\nNode.js           : 24.11.1\nPackage Manager   : pnpm 10.33.0\nOperating System  : linux x64\n\n┌───────────────────────────────┬───────────────────┬───────────────────┐\n│ Package                       │ Installed Version │ Requested Version │\n├───────────────────────────────┼───────────────────┼───────────────────┤\n│ @angular-devkit/build-angular │ 21.2.10           │ ^21.2.10          │\n│ @angular/build                │ 21.2.10           │ ^21.2.10          │\n│ @angular/cli                  │ 21.2.10           │ ^21.2.10          │\n│ @angular/common               │ 21.2.12           │ ^21.2.0           │\n│ @angular/compiler             │ 21.2.12           │ ^21.2.0           │\n│ @angular/compiler-cli         │ 21.2.12           │ ^21.2.0           │\n│ @angular/core                 │ 21.2.12           │ ^21.2.0           │\n│ @angular/forms                │ 21.2.12           │ ^21.2.0           │\n│ @angular/platform-browser     │ 21.2.12           │ ^21.2.0           │\n│ @angular/router               │ 21.2.12           │ ^21.2.0           │\n│ rxjs                          │ 7.8.2             │ ~7.8.0            │\n│ typescript                    │ 5.9.3             │ ~5.9.2            │\n│ vitest                        │ 4.1.5             │ ^4.0.8            │\n└───────────────────────────────┴───────────────────┴───────────────────┘\n```\n\n### Anything else relevant?\n\nThis is only happening when the buildAction is called programatically","author":{"url":"https://github.com/Aukevanoost","@type":"Person","name":"Aukevanoost"},"datePublished":"2026-05-14T06:54:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/33201/angular-cli/issues/33201"}