@reduxjs/toolkit is not compatible with the official React 19 release

[JesusVergara89]

Hello,

I encountered an issue while attempting to use @reduxjs/toolkit with the newly released React 19. The installation fails due to peer dependency conflicts, as @reduxjs/toolkit currently specifies compatibility only with React versions ^16.9.0, ^17.0.0, or ^18.

Here is the error message:

npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR!
npm ERR! While resolving: @reduxjs/[email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/react
npm ERR! peer react@"^19.0.0" from [email protected]
npm ERR! node_modules/react-dom
npm ERR! react-dom@"^19.0.0" from the root project
npm ERR! peer react@">= 16" from [email protected]
npm ERR! node_modules/react-scripts
npm ERR! react-scripts@"5.0.1" from the root project
npm ERR! 1 more (the root project)
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peerOptional react@"^16.9.0 || ^17.0.0 || ^18" from @reduxjs/[email protected]
npm ERR! node_modules/@reduxjs/toolkit
npm ERR! @reduxjs/toolkit@"" from the root project
npm ERR!
npm ERR! Conflicting peer dependency: [email protected]
npm ERR! node_modules/react
npm ERR! peerOptional react@"^16.9.0 || ^17.0.0 || ^18" from @reduxjs/[email protected]
npm ERR! node_modules/@reduxjs/toolkit
npm ERR! @reduxjs/toolkit@"" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR!
npm ERR! For a full report see:
npm ERR! /Users/jesusvergara/.npm/_logs/2024-12-09T20_41_42_736Z-eresolve-report.txt

npm ERR! A complete log of this run can be found in: /Users/jesusvergara/.npm/_logs/2024-12-09T20_41_42_736Z-debug-0.log

[JesusVergara89]

To work around the incompatibility between @reduxjs/toolkit and React 19, I needed to downgrade React to the latest compatible version (React 18)

• npm uninstall react react-dom
• npm install react@18 react-dom@18
• npm install @reduxjs/toolkit

[markerikson]

We've got an open PR at #4409 and should have an updated release out soon.

[markerikson]

Out in https://github.com/reduxjs/redux-toolkit/releases/tag/v2.5.0 !