[0.20.x] vitest no longer works with yarn pnp

Describe the bug

After upgrading to 0.20.x, tests are no longer able to run due to yarn being unable to find a module

events.js:377
      throw er; // Unhandled 'error' event
      ^
Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/home/user/git/vitest_yarn2/.yarn/__virtual__/vitest-virtual-3235595f85/0/cache/vitest-npm-0.20.2-9730ec2bf1-eea156689f.zip/node_modules/vitest/dist/loader.mjs' imported from /home/user/git/vitest_yarn2/
Did you mean to import /home/user/git/vitest_yarn2/.yarn/__virtual__/vitest-virtual-3235595f85/0/cache/vitest-npm-0.20.2-9730ec2bf1-eea156689f.zip/node_modules/vitest/dist/loader.mjs?

Reproduction

Here is a repo that exhibits the problem. I purposefully left it in a working state with vitest at 0.19.1, to show that 0.19.1 worked. The README.md has details on how to reproduce.

https://github.com/jereklas/vitest_yarn2

System Info

System:
    OS: Linux 5.14 Ubuntu 20.04.4 LTS (Focal Fossa)
    CPU: (8) x64 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
    Memory: 465.59 MB / 15.36 GB
    Container: Yes
    Shell: 5.0.17 - /bin/bash
  Binaries:
    Node: 14.20.0 - /usr/bin/node
    Yarn: 3.2.2 - /usr/bin/yarn
    npm: 6.14.17 - /usr/bin/npm
  Browsers:
    Chrome: 103.0.5060.114
    Firefox: 102.0

Used Package Manager

yarn

Validations

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• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn’t already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sheremet-va]

Experienced similar issue in a SolidJS project maintained with pnpm. Tests worked flawlessly with 0.19.x and started failing with a cryptic You appear to have multiple instances of Solid. This can lead to unexpected behavior. in 0.20.x. Workaround to disable deps.registerNodeLoader also works in this scenario.

@manoldonev Solid example was updated, you no longer need to inline solid. You can join discord to see updates.

[sheremet-va]

It’s not possible to use custom experimental loader with Yarn PnP at the moment. We need https://github.com/nodejs/node/pull/43772 to be resolved first.

For now we will detect, if running under Yarn PnP and disable registerNodeLoader in #1773.