Please provide the environment you discovered this bug in.

Angular 20.2.2
Angular Material & CDK 20.2.5
Analog 1.19.4

Which area/package is the issue in?

vitest-angular

Description

The @analogjs/vitest-angular-esm-plugin plugin config "includes" @angular/cdk. As @angular/cdk is also used transitively through @angular/material harnesses, we end up with two instances of the module and two different references to HarnessPredicate for instance.

This will make instanceof checks fail when the the harness is created by @angular/material and used in tests. Note that harnesses created by the user will generally still work.

Ideally, @analogjs/vitest-angular-esm-plugin should only:

• add optimizeDeps: {include: ['tslib']}
• and keep the async/await downgrade logic if a zoneless option is set to false:

  analog/packages/vite-plugin-angular/src/lib/angular-vitest-plugin.ts

  Line 30 in 817b825

  (/fesm2022/.test(id) && _code.includes('async ')) ||

Another workaround is to inline @angular/material but the side effect is that it makes vitest load and transform more code, thus slowing down the tests.

Please provide the exception or error you saw

SyntaxError: '' is not a valid selector

Other information

No response

I would be willing to submit a PR to fix this issue

• Yes
• No