Support Plug-N-Play (Yarn v2)

[brandon-leapyear]

Bug Report

Current behavior

Running tests with yarn version 2 fails with a bunch of errors like

The "@nestjs/platform-express" package is missing. Please, make sure to install this library ($ npm install @nestjs/platform-express) to take advantage of NestFactory.

Yarn version 2 started using the Plug-n-Play API, which prevents packages from require-ing dependencies not explicitly listed in the package's package.json. I'm not sure what the best solution is, but one solution is to add @nestjs/platform-express as a peer dependency for @nestjs/testing. This workaround works for me

# .yarnrc.yml
packageExtensions:
  '@nestjs/testing@*':
    peerDependencies:
      '@nestjs/platform-express': '*'

Input Code

const your = (code) => here;

Expected behavior

Possible Solution

Environment

Nest version: X.Y.Z

 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[brandon-leapyear]

✨ This is an old work account. Please reference @brandonchinn178 for all future communication ✨

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Possibly related to: nestjs/nest-cli#899

[kamilmysliwiec]

We're tracking this here #5477