Redefining aliases for different monorepo packages

[gareimer]

I want ~ to refer to different package roots in a monorepo, depending on which file it is in. Here are the details:

I have a yarn monorepo with a structure similar to this example:

vitest.workspace.json
packages/
  app/
    vitest.config.js
    src/
      App.js
      App.test.js 
  shared/
    vitest.config.js
    src/
      getRemainder.js
      isEven.js
      index.js

vitest.workspace.json looks like this:

[
  "packages/*/vitest.config.js"
]

Both vitest.config.js files look like this:

import { defineConfig } from 'vitest/config';

export default defineConfig({
  test: {
    environment: 'happy-dom',
    name: 'app',     // ('shared' in the shared package)
    alias: {
      '~': new URL('.', import.meta.url).pathname
    }
  }
});

I am using parcel, which allows me to import relative to the nearest package root using ~/src/.

App.test.js:

import App from `~/src/App`;
// run tests on App.

App.js:

import {isEven} from 'shared';
export default function App() {
 //...
};

packages/shared/src/index.js:

export {default as isEven} from './isEven';

isEven.js:

import getRemainder from '~/src/getRemainder';
export default function isEven(num) {
  return getRemainder(num, 2) === 0;
}

getRemainder.js:

export default function getRemainder(a, b) {
  return a % b;
}

(by the way, I don't actually have these isEven and getRemainder functions :)).

Now, what happens is that when I run vitest on App.test.js, it resolves App just fine using the alias, but it can't resolve getRemainder, as it is apparently looking in packages/app/ for it.