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The first step toward #3842
This diff updates to React v18 and enjoys the benefit of automatic performance improvement. It does not take further steps toward the new features, but it will be a good starting point.
The biggest issue was the
react-hot-loader
, which is not maintained anymore and is not compatible with v18. I successfully replaced it withReact Fast Refresh
though, which is the recommended way.@testing-library/*
libraries also have been updated and the tests are fixed.On top of this, we can gradually adopt the new features:
startTransition
useDeferredValue
Tested on Linux, and macOS (amd64).