facebook / react · Issue No. 37209

[Compiler Bug]: stale computed value

Openby kraftwer1opened Aug 5, 2026updated Aug 5, 20260 comments

Type: BugStatus: Unconfirmed

Description

What kind of issue is this?

React Compiler core (the JS output is incorrect, or your app works incorrectly after optimization)
babel-plugin-react-compiler (build issue installing or using the Babel plugin)
eslint-plugin-react-hooks (build issue installing or using the eslint plugin)
react-compiler-healthcheck (build issue installing or using the healthcheck script)

Link to repro

https://playground.react.dev/#N4Igzg9grgTgxgUxALhASwLYAcIwC4AEwBUYCAogGaUJx4A0JZVNd5AbggHYNMIDKeAIZ4EBAL4FKMCBgIAdEDARC6igNzyuWhAA8c+AgBMElIVAA2hSlC500ELgQCCWLAAoAlES0ECcRzBCAG0jESFGMjwAEXCAXQIAXj5BEQR3YLjPTW0nf0DCCwgAcwAZbmK8AAskvhZaPA5uPHcvJIA+Hzy-AK5ICwQAOiLi90UBrkqqxUYJqezfCQXcnoKCOerasOFhis2AWgIABhzF0gpqBtbvRM7gRb8AekeCAFkIOABrKQQ8OGnugQogAVTAIaAtNq3IG-WLCDIARkYACYsowAMxHI7LB4EZ4EJo8GF4KBYXFCIxGQl4UpoILcBAwMYgOAWNBfGbrErlSbVZZ+PzKEkwJxQzrKDAQTjU2n0riM5ms9mfTkjHnzHJ+cSMTI4vJC2BOAA8RjQ7HaAGE2V8CEIuABPADuVUZYjwEC5xQI1TEGyqRsepvNOXEWhA9BZjkoaGKKBA9zyzwC2DQFhEDi47xMyAUICEFgsii04nD4CqEEdAEkeIyuPmwCgzBYyOIgA

Repro steps

Run the snippet in the Playground
Click anywhere to log the array length
See that the length is 0 instead of 2

How often does this bug happen?

Every time

What version of React are you using?

19.2.8

What version of React Compiler are you using?

1.0.0

Relay Analysis

View on GitHub

Relay reads this issue against the repository's contribution signals: the files it is likely to touch, how the maintainers triage work this size, and what the first contribution would exercise.

The full analysis for this issue is still being assembled. Until then, the description above and the thread on GitHub are the most reliable context.