[Compiler Bug]: eslint-plugin-react-hooks silent bailout when try/catch/finally block in the same component body

[TudorGiuroiu]

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/#N4Igzg9grgTgxgUxALhAHRFMCAEcA2AlggHYAuGaJVhAtgA4Qxk7A5YIAKAhjN7WBwBfHADMYEWjgwkEADzIB6EtwBuhAObcyhCNXQk6jZq3bYAsgloRhYiVIwwE3OBQNV5xlgBMEo7lD4LKJQJK66JDgAQlAaAEoI9BLeUOF6ABQAlKxUOHl4emAsTuoIAO4Akt44ALw4AHJQtABGCDDpHDx8AlkA2o4IpWUAtITeGAC6mVQzkflwhSyCdRyW1ulZtQB8OXP584UQ+AgAdPgQGuklxJXe03v7OIqKOOaEYGCEJBo4TmSwJAAhLl8kIADQ4XrXcpVKYghYkSDHM4XdJge77EF5MgwACeu0eB0RR1O50uGAAynRAtovj8FgxjnICuQJPgxOcyhgMaC8No4AALHDpNoSGDIdgkADWJAgZRI2WAWMeCKRp1FTBFMDFPLyIlEX24+Hw+KVD32qpJKPJIAAwsduCQoPRucqhLN9n8ATgADzeQiqLa2gUIOBSnBEchtHDQMj0KAsdIUgXQfDVVo4ACMOA1MAh7xwAAZMj7FP7A1QhCAwSAEQaNCgQEYmCwyLj6Lg2Jx8LEvgB5eg6Qq2cSSHAAcma3Fa+GG9B7Gi+wycLjIwwZ9EIxxgZfeZHHAG5ZukzXlnhut7S9OYIL4JRgjfhKCQRGBaWADQhBN3eyQB0PEUyA9q3AFNKijGAVHwMAUH8aCECEIA

Repro steps

1. Install eslint-plugin-react-hooks@7.0.1 (or latest).
2. Create a React component with a clear rule violation (e.g., useMemo with no return value).
3. Observe that the linter correctly reports the error.
4. Add a try/catch or try/catch/finally block anywhere inside the component body.
5. Bug: The linter stops reporting the useMemo error (and all other compiler errors) for that component.
   Note: In the React Playground, when recreating the example, I see that the the try/catch/finally block actually throws an error, but the useMemo one is still ignored

Expected Behavior

The linter should flag the useMemo error regardless of the try/catch block present in the component.

Actual Behavior

The linter reports 0 errors. Removing the try/catch block immediately causes the useMemo error to reappear.

How often does this bug happen?

Every time

What version of React are you using?

19.1.1

What version of React Compiler are you using?

I don't use React compiler, but I use eslint-plugin-react-hooks version 7.0.1

[zaiddA]

Hi,
Even though I do not use the compiler in my local setup, the repro is in the React Playground, which does run the React Compiler. The error shown is BuildHIR::lowerStatement (try/finally not handled), and after that, the missing return in useMemo is no longer reported. So this looks like a limitation of the React Compiler core rather than an eslint‑plugin‑react‑hooks issue.

[josephsavona]

This is a known limitation of the compiler. If the compiler cannot handle some syntax, then it will not report any further diagnostics. In this case, we don't support finally blocks yet.

There is an undocumented react-hooks/todo rule that will show you all the todos.

[zaiddA]

Thanks for confirming!
Could you please share how to enable the undocumented react-hooks/todo rule (or the recommended ESLint config) so I can see the full todo list?

[kpako135600-blip]

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