How to mock import.meta.glob()?

[vekunz]

Hello, I have a very special mocking question.

We have code, that dynamically imports files with a glob pattern. We use this statement for this:

const modules = import.meta.glob('somewhere/*/*.js');

Now I have to write unit tests for this code. I tried several ways to mock the import.meta.glob() call but without success. I tried these options:

• vi.mock('somewhere/folder/file.js', () => ...)
• vi.spyOn(import.meta, 'glob').mockReturnValue(...)
• import.meta.glob = vi.fn().mockReturnValue(...)
• vi.stubGlobal('import', {meta: {glob: vi.fn().mockReturnValue(...)}})

The last three I executed in a vi.hoisted() statement.

In any case, the mock did not work. While executing the test, import.meta.glob() imported the actual files from the file system.

Is there any way to directly mock import.meta.glob()?

[eloiqs]

We also aren't able to mock import.meta.env.DEV value like this

Object.defineProperty(import.meta.env, 'DEV', { value: false });

This works though:

Object.defineProperty(import.meta.env, 'NODE_ENV', { value: 'production' });

[sheremet-va]

You can just assign it:

import.meta.env.NODE_ENV = 'production'

[luiguild]

Just include in your tsconfig.json

"compilerOptions": {
    "types": [
      //... your types
      "vitest/globals"
    ],
    "module": "ES2022" // can be other versions too
}

After that you supposed to be able to use the import.meta.glob in your tests.

[vekunz]

Do you mean vitest/globals? We already have this. But we don't want to use import.meta.glob but we want to mock it.

[sheremet-va]

You cannot mock it, import.meta.glob doesn't exist at runtime, it's a compiler hint. You need to mock all modules that it imports one by one.

[ricardovanlaarhoven]

But is there a way to test a function that depends on it?

[AnshulSurana]

I also want to mock in vitest, import.meta.client and import.meta.server, these two seems to be read-only values from Nuxt 3.
But i was able to mock process.client and process.server.

[simonesada]

Has anyone found a solution?