Command

test

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

I am running unit tests with vitest in the node cofig. To test http requests I would like to use https://mswjs.io/
The build is complaining though because msw/node should not be included in a browser environment. I can not mark the dependency as external though.
My build is a packagr builder since the tests are for a library.
Happy to provide more information if needed.

Minimal Reproduction

Try to import import { setupServer } from 'msw/node' according to the vitest guide https://vitest.dev/guide/mocking.html#requests in the unit-test builder tests for a library

Exception or Error

Your Environment

Angular CLI: 20.1.0
Node: 24.2.0
Package Manager: yarn 4.9.2
OS: darwin arm64

Angular: 20.1.0
... build, cli, common, compiler, compiler-cli, core, forms
... platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.2001.0
@angular-devkit/core         20.1.0
@angular-devkit/schematics   20.1.0
@schematics/angular          20.1.0
ng-packagr                   20.1.0
rxjs                         7.8.2
typescript                   5.8.3

Anything else relevant?

No response