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Summary: This diff enables optional [Fast Refresh](https://reactnative.dev/docs/fast-refresh) for Flipper in dev mode. It can be opted-in using additional argument "--fast-refresh": `yarn start --fast-refresh`. I've copy-pasted the most part of implementation from React Native with some minor changes. I made this optional for now as it works not ideally. In most cases which I checked it works fine, however for some files it falls back to full refresh (e.g. when `desktop/plugins/network/index.tsx` changed) and sometimes doesn't refresh content even after change detected and re-compiled (e.g. when `src/ui/components/searchable/Searchable.tsx` is changed, Network plugin which is dependent on it is not refreshed automatically). State from redux is restored after fast refresh, but local state in class-based components is cleared. For function-based components local state is also stored, so it's an additional point to make plugins components functional :) Also, for now there is no UI for Fast Refresh (loading indicator etc), information is just logged to console. Changelog: Experimental support for Fast Refresh in dev mode can be enabled by `yarn start --fast-refresh`. Reviewed By: jknoxville Differential Revision: D20993073 fbshipit-source-id: 65632788df105a85fac0b924b7808120900b349e
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932 B