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96f3093bec
I originally added this with a plan to visualize which nodes got updated after a Fast Refresh. I didn't end up implementing that part, and to my knowledge, no actively used integration actually does that or use this method. - [Webpack plugin doesn't use it](f1c8b9a441/lib/runtime/RefreshUtils.js) - [RN doesn't use it](23c5c42de0/packages/react-native/Libraries/Core/setUpReactRefresh.js) - [Global GitHub code search](https://github.com/search?q=findAffectedHostInstances&type=code&p=1) only shows copies of this code and the type definition based on it, but not actual calls to it We should be able to delete this without a problem.
react-refresh
This package implements the wiring necessary to integrate Fast Refresh into bundlers. Fast Refresh is a feature that lets you edit React components in a running application without losing their state. It is similar to an old feature known as "hot reloading", but Fast Refresh is more reliable and officially supported by React.
This package is primarily aimed at developers of bundler plugins. If you’re working on one, here is a rough guide for Fast Refresh integration using this package.