I tried to work ReactFiber Debugger by the following way. But it doesn't work.

Running

First, npm run build in React root repo folder.

Then npm install and npm start in this folder.

Open http://localhost:3000 in Chrome.

• https://github.com/facebook/react/tree/master/examples/fiber/debugger

This PR is to fix that.
To do that, is it ok to add fiber.js into react-dom?

In addition to that, I've fixed warnings about keys.

Thanks.

Oh, I think it didn't work because I deleted React from package.json but not from Yarn lockfile. Could you try just removing React from lockfile? That should work too.

@gaearon Thanks! You are right. I missed .env and CRA is using dotenv. This issue is only react-dom is in yarn.lock.

This looks good, thanks! To be clear, your approach would also work, I'm just not sure if file: is supported in all versions of Node or not.

Thanks!

file: is supported in all versions of Node or not.

I'm using file: with npm v2 and v3, which is fine. But I'm not sure it works in all environments including Windows :)