Upgrading create react app to version 4 gives : ReferenceError: Cannot access 'middleware' before initialization

user_4702527 0
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I tried upgrading react scripts to 4.0.1 and type script to "4.1.3" and react to "17.0.1". I deleted the node_modules and lock files, then installed again with yarn install command. When I run yarn start, I get error ReferenceError: Cannot access 'middleware' before initialization

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When I set FAST_REFRESH=false in .env file app loads with no issues, So it is something with react refresh

react-scripts webpack-dev-server create-react-app webpack reactjs
1 Answers

It's a known issue https://github.com/facebook/create-react-app/issues/9904. It has to do with a change in Create React App. Fast Refresh, or React Refresh is about to replace Hot Reload. By default FAST_REFRESH is set to true.

For now I stick to Hot Reload, by setting FAST_REFRESH=false as you did and track the issue given above.

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