Experimental: Deprecated folder mapping

[callumok2004]

What version of Next.js are you using?

12.0.4

What version of Node.js are you using?

16.13.0

What browser are you using?

Chrome

What operating system are you using?

Windows 11

How are you deploying your application?

Development Server | yarn dev

Describe the Bug

When I start the development server, I am instantly faced with this error.

Expected Behavior

There should be no errors.

To Reproduce

Dependencies

    "next": "12.0.4",
    "react": "^beta",
    "react-dom": "^beta",
    "sass": "^1.43.4"

Config

{
  swcMinify: true,
  reactStrictMode: true,
  compress: true,
  experimental: {
    concurrentFeatures: true,
    serverComponents: true,
    reactRoot: true
  }
}

Folder layout

[huozhi]

This issue was fixed in 12.0.5-canary.0. Can you upgrade to the versions above it to see if it's resolved?

[callumok2004]

This issue was fixed in 12.0.5-canary.0. Can you upgrade to the versions above it to see if it's resolved?

Are you sure, I still receive this error.

(node:22912) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at E:\Developing\ZARP\node_modules\react\package.json.
Update this package.json to use a subpath pattern like "./*".
(Use `node --trace-deprecation ...` to show where the warning was created)

[huozhi]

Seems the warning "Deprecated folder mapping" is from react 18 beta due to the wildcard matching in package.json.
facebook/react#22783

I'm not able to repro it with latest next canary and react 18 rc2. Going to close it but if you still have any problem with it feel free to ping us again here.

Notice there's a config change that we deprecated the concurrentFeatures: boolean option and switch to runtime: 'nodejs' | 'edge'.

[github-actions]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.