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