[ENHANCEMENT]: Yarn PnP support for serve command

[vhiairrassary]

Is your feature request related to a problem? Please describe.

When using yarn v2, we can't use serve as @webpack-cli/serve is not declared as a dependency. It should be be declared as an optional peer dependency. Same for webpack-dev-server:

{
  "peerDependencies": {
    "@webpack-cli/serve": "*",
    "webpack-dev-server": "*"
  },
  "peerDependenciesMeta": {
    "@webpack-cli/serve": {
      "optional": true
    },
    "webpack-dev-server": {
      "optional": true
    }
  }
}

Additional context

Similar work for webpack-dev-server: webpack/webpack-dev-server#2191 (but not enough as next major version will not include the webpack-dev-server binary, and we will have to use webpack-cli)

Optional peer dependencies RFC: https://github.com/yarnpkg/rfcs/blob/master/accepted/0000-optional-peer-dependencies.md

[evenstensberg]

Yep we can do that, will need for #1011 to land then we can fix this.

[evenstensberg]

@Loonride could you pick this up? Would greatly appreciate it and we really need it.

CC @evilebottnawi

[knagaitsev]

@Loonride could you pick this up? Would greatly appreciate it and we really need it.

CC @evilebottnawi

@evenstensberg I already added webpack-dev-server as optional peer dependency here:

webpack-cli/packages/serve/package.json

Lines 26 to 33 in 181822f

	"peerDependencies": {
	"webpack-dev-server": ">=4.0.0"
	},
	"peerDependenciesMeta": {
	"webpack-dev-server": {
	"optional": true
	}
	},

Do we need this for all the packages (serve, init, etc.)?

[alexander-akait]

What @webpack-cli/serve is it?

[alexander-akait]

For webpack-dev-server all solved

[alexander-akait]

@evenstensberg should you install @webpack-cli/serve for using webpack serve?

Oh my god, seriously? Where is 0CJS?

Basic commands like:

1. Run webpack
2. Generate first configuration
3. Run dev server
4. Output information like env/config/etc

should works out of box without any additional installation.

[alexander-akait]

Look at the others CLI programs, no one forces you to install additional modules for basic work