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Issue created by Administrator@rootContributor

FAST_REFRESH behaviour

Created by: hyperknot

  1. FAST_REFRESH is mentioned as experimental / unstable in the original release log here: https://github.com/facebook/create-react-app/pull/8582 and here: https://github.com/facebook/create-react-app/blob/3f5dea91c1721b233e5a2b514ff9ea6fbc76ff97/packages/react-scripts/config/env.js#L97-L98

  2. I can confirm it's very unstable / unusable today. It doesn't detect any change in non-UI components, for example MobX stores, thus the whole refresh is broken, I always have to reload manually now.

  3. Against what is written in the release log and source code comments, it is actually ENABLED by default today. https://github.com/facebook/create-react-app/blob/3f5dea91c1721b233e5a2b514ff9ea6fbc76ff97/packages/react-scripts/config/env.js#L100

I believe this line need to be changed to === 'true', to make it disabled by default. Also, a small explanation should be added to the next release log, this feature is really not documented at all.