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For maintainers only:

• This needs to be documented (issue in webpack/webpack.js.org will be filed when merged)
• This needs to be backported to webpack 4 (issue will be created when merged)

Webpack doesn't use webpack-cli I am wrong

It does actually, it tries to require it in these locations

Is it allowed to use peerDependenciesMeta without using peerDependencies?

Yes, Yarn 2 and potentially pnpm will treat it as if you also specified

"peerDependencies": {
  "webpack-cli": "*"
}

Yarn 1 and probably npm will just ignore it

Thank you for your pull request! The most important CI builds succeeded, we’ll review the pull request soon.

@sokra we use same for webpack-dev-server, https://github.com/webpack/webpack-dev-server/blob/master/package.json#L119

/cc @arcanis it is valid, right?

Yep! 👍

Thanks