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## Summary This PR bumps Flow all the way to the latest 0.245.2. Most of the suppressions comes from Flow v0.239.0's change to include undefined in the return of `Array.pop`. I also enabled `react.custom_jsx_typing=true` and added custom jsx typing to match the old behavior that `React.createElement` is effectively any typed. This is necessary since various builtin components like `React.Fragment` is actually symbol in the React repo instead of `React.AbstractComponent<...>`. It can be made more accurate by customizing the `React$CustomJSXFactory` type, but I will leave it to the React team to decide. ## How did you test this change? `yarn flow` for all the renderers
react-debug-tools
This is an experimental package for debugging React renderers.
Its API is not as stable as that of React, React Native, or React DOM, and does not follow the common versioning scheme.
Use it at your own risk.