Error: No known conditions for "./browser" specifier in "msw" package about msw

[Ankur-Marwaha]

After a lot of banging my head on the wall. I found a silly solution/mistake for myself.

Hope it helps someone out there.

export default defineConfig({
  test: {
    ...
    coverage: {
      ...
      exclude: [
        ...,
        '**/browser.ts',      // Added these to be excluded from coverage
        '**/handler.ts',
      ],
      thresholds: {
        ...
      },
    },
  },
});

[justintoman]

@Ankur-Marwaha Thank you so much for posting your solution! I had the exact same thing going on and it was driving me nuts!

[ulidtko]

@Ankur-Marwaha that's not a (good) solution.

I'm also getting this error without --coverage, from simply npx vitest.

[Ankur-Marwaha]

@ulidtko , I agree

But i feel there is no point in testing this as well.

[ulidtko]

OK so in my case, the mistake was that this project was using setupWorker from 'msw/browser' — in a node server test.

The fix was to rewrite the mock fixture to import { setupServer } from 'msw/node', etc.