Missing dependencies when using Yarn 2 on razzle 3.x

[icyrockcom]

🐛 Bug report

Current Behavior

This is from a fresh app created by:

$ yarn create razzle-app --no-install typescript-razzle-require-unsound
$ cd typescript-razzle-require-unsound
$ yarn set version berry
$ yarn install
$ yarn razzle start

A couple dependencies seem to be missing:

Error: @pmmmwh/react-refresh-webpack-plugin tried to access webpack, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.
Error: razzle tried to access postcss-load-config, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.

These can be resolved by adding these in .yarnrc.yml:

packageExtensions:
  "@pmmmwh/react-refresh-webpack-plugin@*":
    peerDependencies:
      webpack: ^5.0.0
  razzle@*:
    dependencies:
      postcss-load-config: ^2.0.0

Expected behavior

Should work out of the box.

Reproducible example

https://github.com/icyrockcom/typescript-razzle-require-unsound

Suggested solution(s)

Upgrading to this release might fix the first one https://github.com/pmmmwh/react-refresh-webpack-plugin/releases/tag/v0.4.3.

Additional context

N/A.

Your environment

Software	Version(s)
Razzle	3.3.11
Razzle Plugins	None
Node	v14.15.4
Browser	N/A
npm/Yarn	Yarn 2.4.0
Operating System	Linux (Xubuntu 20.04.1 LTS)
TypeScript	N/A
React	N/A

[fivethreeo]

yarn2 in 3.x will not be supported. In 4.0 I will make razzle and examples installable but yarn2 will require other changes aswell to be useable.