codesandbox / codesandbox/codesandbox-client
When mounting and with StrictMode disabled, Component with useState hook sometimes once (as expected), sometimes renders twice (not normal)
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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
When mounting and with StrictMode disabled, Component with useState hook sometimes once (as expected), sometimes renders twice (not normal), as seen in the console
How has this issue affected you? What are you trying to accomplish?
Having the exact same behavior as in other IDEs, should only render once.
To Reproduce
Consider this example and refresh the page after its fully loaded to see the behavior:
Link to sandbox: link
Your Environment
| Software | Name/Version |
|---|---|
| Сodesandbox | 0.0.158 |
| Browser | Version 120.0.6099.200 (Official Build) (64-bit) |
| Operating System | Windows 10 |
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 reproduction and verify the behavior with StrictMode disabled, checking whether mounting the component causes one or two renders. Isolate the conditions that trigger the duplicate render; done means the component consistently renders once on mount under the reported setup.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, react
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100