codesandbox / codesandbox/codesandbox-client
Codesandbox preview error when using React 19
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- Dominant language
- JavaScript
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Description
🐛 bug report
Preflight Checklist
- I have read the Contributing Guidelines for this project.
- I agree to follow the Code of Conduct that this project
adheres to. - I have searched the issue tracker for an issue that matches the one I want
to file, without success.
Description of the problem
After React 19 was released, we noticed that some of our demos (e.g. https://mui.com/x/react-data-grid/#pro-plan) show an error when opened in Codesandbox: https://codesandbox.io/p/sandbox/floral-http-hll4y8
When the preview is opened in a new tab, the error isn't shown: https://hll4y8.csb.app/
How has this issue affected you? What are you trying to accomplish?
We get bug reports about this in our repo: https://github.com/mui/mui-x/issues/15765
To Reproduce
Link to sandbox:
The error is only reproducible with React 19.
❌ With React 19: https://codesandbox.io/p/sandbox/elastic-forest-nhckjq
✅ With React 18: https://codesandbox.io/p/sandbox/rough-browser-xvhfll
It looks like the Codesandbox client patches the console.error function.
If I use console.log instead of console.error, the error is gone.
When I patched console.error myself, the error was gone too: https://codesandbox.io/p/sandbox/white-shadow-4hpjxn
Your Environment
| Software | Name/Version |
|---|---|
| Сodesandbox | 0.0.375 |
| Browser | Chromium: 131.0.6778.85 (Official Build) (arm64) |
| Operating System | MacOS 15.1.1 |
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked CodeSandbox reproductions and compare the React 18 and React 19 cases, focusing on the embedded preview and the console.error behavior described in the report. The issue is resolved when the React 19 demos no longer show an error in the embedded CodeSandbox preview while preserving the working new-tab preview.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, react
- Domain
- devtools, frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100