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[Compiler Bug]: False positive for “impure function during render” inside callback

facebook/react#34046·250633·JavaScript·322 天未动·0 条评论·上游最近活跃 ·池内状态:可认领
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上游 issue 正文

### 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) - [x] eslint-plugin-react-compiler (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/#N4Igzg9grgTgxgUxALhASwLYAcIwC4AEwBUYCASggGYA0JZAolVQnHnaQgMICGANnwBGPOAGsCAXwJUYEDAQDkMBCLwKA3AB0AdjoQAPHPgIATajyh9CVKNrZoI2ggFkAngEEsWABQBKIjoEBHCOYITKAI5QCGGUVAQAvPQU1N7alny+WrpOwaGEPNqYPHgIicm8AsJi3t54mAj+CQB8AblBIdqQfAgAdHwQAObeziUAFr0whSZyfgQA1AT1GI3ZQUGR0bHUvXCwytqESZsxeO5FGCUO2gBiUyvehcWlWYGSdADaALqvOUEA9P8CABlPA8Yx4MZlA5mGAEAYQLBvThMFhsWpNVrAN4bBBRU5xXb7BCHconMLnZ7XO48B5PS4vNbrZR4WBOOYtIgENDxbzkvCEvYwA54fxwQqIPiUhnU+4IPl4rYCnZCkVZSRMiSfeklBA-bJvFlsgjpATZCQ6EASIA ### Repro steps Run eslint-plugin-react-hooks with the react-compiler rule turned on See ``` Error: Cannot call impure function during render `Math.random` is an impure function. Calling an impure function can produce unstable results that update unpredictably when the component happens to re-render. ``` Math.random() is not called during render, and is only called during a useCallback that is called outside of the component’s render cycle: ```ts import { useRef, useEffect, useCallback } from 'react'; export default function MyApp() { const requestRef = useRef<number | null>(null); const animate = useCallback((time: number) => { // ⚠️ false positive “impure function called during render” here: console.log(Math.random() + time); requestRef.current = requestAnimationFrame(animate); }, []); // Start the render loop useEffect(() => { requestRef.current = requestAnimationFrame(animate); return () => { if (requestRef.current) cancelAnimationFrame(requestRef.current); }; }, [animate]); return null; } ``` ### How often does this bug hap…
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