reactjs / reactjs/react.dev

[Bug]: Code examples are not working with "Incompatible React versions" error.

Open
#8,563 2 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

bug: unconfirmed
Dominant language
JavaScript
Stars
11.8k
Forks
7.9k
Avg merge
1d 11h
Merged PRs (30d)
11

Description

Summary

I have an error on all code examples on the site: blog, doc, etc.

Error
Incompatible React versions: The "react" and "react-dom" packages must have the exact same version. Instead got:
  - react:      19.3.0-canary-96fcba90-20260728
  - react-dom:  19.3.0-canary-1724e9ce-20260729
Learn more: https://react.dev/warnings/version-mismatch
Page

https://react.dev/reference/react/ViewTransition#animating-an-element-on-enter

Details
Image

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Open the reported ViewTransition documentation page and reproduce the failure in its code examples, checking whether the same mismatch appears across the blog and docs examples. Trace where the displayed React and react-dom versions are selected; done means the examples load without the incompatible-version error.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, react
Domain
documentation
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
55/100

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.