Bug: linked package incorrectly uses node_modules instead of pnpapi

[noahnu]

enhanced-resolve is incorrectly escaping from the pnpapi context.

Context

Encountered this via webpack initially using Yarn 2's pnpapi.

With Webpack:

Repro project: https://github.com/noahnu/yarn-repro-linking-non-pnp, after cloning the project, cd yarn2-pnp-project && yarn build then search for yarn1-nm-project/node_modules/react-dom/index.js in the dist/bundle.js file. It's from node_modules.

And without webpack, purely using enhanced-resolve:

Repro:

Clone: https://github.com/noahnu/yarn-repro-linking-non-pnp/tree/pure_enhance

and run the bash script: ./run-repro.sh.

const assert = require('assert')
const resolve = require('enhanced-resolve')

assert.equal(
  resolve.sync(require.resolve('my-linked-package'), 'react-dom'),
  require.resolve('react-dom', {
    paths: [require.resolve('my-linked-package')],
  })
)

Expectation

I expect the assertion to pass, as both should be going through pnp.