Add support for self-referencing the current package in tests

[ifiokjr]

Clear and concise description of the problem

As a user of vitest I would like to self reference the current package by name when importing in a test. This is a builtin node feature for projects which specify "type": "module".

Given a folder structure of:

my-package/
├─ package.json
├─ index.js
├─ tests/
│  ├─ my-package.spec.js

And files with this content:

// my-package/package.json

{
  "name": "my-package",
  "type": "module",
  "exports": "./index.js"
}

// my-package/tests/my-package.spec.js

import myPackage from 'my-package';
import { test, expect } from 'vitest';

test('myPackage', () => {
  expect(myPackage).toBeTruthy();
})

I would like to be able to write the following in the test folder. Currently, when I do this I get the following error:

- Error: [vite-node] Failed to load my-package

Suggested solution

I'm not sure whether this is a request that should be raised in vite, or should be added as a vite-plugin.

Example

Here is a reproduction of the current issue faced: https://stackblitz.com/edit/github-w9fjy7-bba6ny?file=my-package.spec.js

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[antfu]

You can set alias in your vite.config.ts

export default defineConfig({
  resolve: {
    alias: {
      'my-package': resolve('./src/index.ts')
    }
  }
})

[ifiokjr]

Thanks @antfu this works.

In a monorepo environment with multiple packages, each package will have to be added as an alias, which means all packages will be available from all test code regardless of location.

Ideally, the location of the test should determine how self-reference package names are resolved.

I'll see if I can create a general purpose vite plugin to handle this.