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[Compiler Bug]: Compiler optimizes away useMemo with manual dependencies

facebook/react#33559·250633·JavaScript·322 天未动·1 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? - [x] 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-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/#N4Igzg9grgTgxgUxALhASwLYAcIwC4AEwBUYCAsghhAQL4EBmMEGBA5DAgIZx5sDcAHQB2IgPRiCAQQAmMgmQA2DAGLCAFADcuiqAgCUBNMLBoZCAngAWF0hSo08NMhesWEADywJeCeQCMEKy5NNFwROAgTQiVVYQIAXgIPRIA+ZKFRYU8cfEYoYV4w+LsASXNhPDQ8AE8tHT0AGiMKqtq1Q2ARAgJI6JaESuqaxIGh9o1tXQNMns48WBKySmp1dUME9Prp-WaAbTNBtpqAXX1M2hEQWiA ### Repro steps We have a hook like this that basically returns the previous value if the calculated identity of the value hasn't changed (e.g. Dayjs object and its unix timestamp) ```ts function useIdentity(value, identityFn) { const identity = identityFn(value); return useMemo(() => value, [identity]); } ``` I noticed the tests for this were failing after enabling React Compiler. This hook violates the rules-of-react and has the linter directives to disable it. But for some reason the compiler isn't able to detect the violation. If I write the hook like this, the optimization is skipped as expected. ```ts const selfFn = x => x; function useIdentity(value, identityFn) { const identity = identityFn(value); return useMemo(() => selfFn(value), [identity]); } ``` So I guess the hook doesn't respect the manual optimization because the `() => value` expression is too simple and thinks it can be optimized without issues. ### How often does this bug happen? Every time ### What version of React are you using? 19.1.0 ### What version of React Compiler are you using? 19.1.0-rc.2
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