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Fiber Debugger

This is a debugger handy for visualizing how Fiber works internally.

It is only meant to be used by React contributors, and not by React users.

It is likely that it might get broken at some point. If it’s broken, ping Dan.


First, npm run build in React root repo folder.

Then npm install and npm start in this folder.

Open http://localhost:3000 in Chrome.


fiber debugger