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## Overview The error messages that say: > ReactDOM.hydrate is no longer supported in React 18 Don't make sense in the React 19 release. Instead, they should say: > ReactDOM.hydrate was removed in React 19. For legacy mode, they should say: > ReactDOM.hydrate has not been supported since React 18.
Harness for testing local changes to the react-devtools-inline and react-devtools-shared packages.
Development
This target should be run in parallel with the react-devtools-inline package. The first step then is to run that target following the instructions in the react-devtools-inline README's local development section.
The test harness can then be run as follows:
cd packages/react-devtools-shell
yarn start
Once you set both up, you can view the test harness with inlined devtools in browser at http://localhost:8080/