[Compiler] Don't count a setState in the dependency array of the effect it is called on as a usage #35134
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…ct it is called on as a usage Summary: The validation only allows setState declaration as a usage outside of the effect. Another edge case is that if you add the setState being validated in the dependency array you also make the validation opt out since it counts as a usage outside of the effect. Added a bit of logic to consider the effect's deps when creating the cache for setState usages within the effect Test Plan: Added a fixture
josephsavona
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Nov 14, 2025
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| function Component({prop}) { | ||
| const [s, setS] = useState(0); | ||
| useEffect(() => { | ||
| setS(prop); | ||
| }, [prop, setS]); |
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nit: maybe pass the setState down in props that way it's reactive and has to be included as a dep?
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That would disallow the lint as per the next diff 😅 might have to keep it like this in the short term
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…ns lint (#35135) Summary: This only matters when enableTreatSetIdentifiersAsStateSetters=true This pattern is still bad. But Right now the validation can only recommend to move stuff to "calculate in render" A global setState should not be moved to render, not even conditionally and you can't remove state without crossing Component boundaries, which makes this a different kind of fix. So while we are only suggesting "calculate in render" as a fix we should disallow the lint from throwing in this case IMO Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35135). * __->__ #35135 * #35134
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…ct it is called on as a usage (#35134) Summary: The validation only allows setState declaration as a usage outside of the effect. Another edge case is that if you add the setState being validated in the dependency array you also make the validation opt out since it counts as a usage outside of the effect. Added a bit of logic to consider the effect's deps when creating the cache for setState usages within the effect Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35134). * #35135 * __->__ #35134 DiffTrain build for [de97ef9](de97ef9)
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…ct it is called on as a usage (#35134) Summary: The validation only allows setState declaration as a usage outside of the effect. Another edge case is that if you add the setState being validated in the dependency array you also make the validation opt out since it counts as a usage outside of the effect. Added a bit of logic to consider the effect's deps when creating the cache for setState usages within the effect Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35134). * #35135 * __->__ #35134 DiffTrain build for [de97ef9](de97ef9)
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…ns lint (#35135) Summary: This only matters when enableTreatSetIdentifiersAsStateSetters=true This pattern is still bad. But Right now the validation can only recommend to move stuff to "calculate in render" A global setState should not be moved to render, not even conditionally and you can't remove state without crossing Component boundaries, which makes this a different kind of fix. So while we are only suggesting "calculate in render" as a fix we should disallow the lint from throwing in this case IMO Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35135). * __->__ #35135 * #35134 DiffTrain build for [257b033](257b033)
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Nov 14, 2025
…ns lint (#35135) Summary: This only matters when enableTreatSetIdentifiersAsStateSetters=true This pattern is still bad. But Right now the validation can only recommend to move stuff to "calculate in render" A global setState should not be moved to render, not even conditionally and you can't remove state without crossing Component boundaries, which makes this a different kind of fix. So while we are only suggesting "calculate in render" as a fix we should disallow the lint from throwing in this case IMO Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35135). * __->__ #35135 * #35134 DiffTrain build for [257b033](257b033)
manNomi
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…ct it is called on as a usage (facebook#35134) Summary: The validation only allows setState declaration as a usage outside of the effect. Another edge case is that if you add the setState being validated in the dependency array you also make the validation opt out since it counts as a usage outside of the effect. Added a bit of logic to consider the effect's deps when creating the cache for setState usages within the effect Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35134). * facebook#35135 * __->__ facebook#35134
manNomi
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…ns lint (facebook#35135) Summary: This only matters when enableTreatSetIdentifiersAsStateSetters=true This pattern is still bad. But Right now the validation can only recommend to move stuff to "calculate in render" A global setState should not be moved to render, not even conditionally and you can't remove state without crossing Component boundaries, which makes this a different kind of fix. So while we are only suggesting "calculate in render" as a fix we should disallow the lint from throwing in this case IMO Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35135). * __->__ facebook#35135 * facebook#35134
unstubbable
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Nov 15, 2025
[diff facebook/react@93fc5740...fb2177c1](facebook/react@93fc574...fb2177c) <details> <summary>React upstream changes</summary> - facebook/react#35143 - facebook/react#35145 - facebook/react#35140 - facebook/react#35139 - facebook/react#35062 - facebook/react#35135 - facebook/react#35134 </details>
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…ns lint (facebook#35135) Summary: This only matters when enableTreatSetIdentifiersAsStateSetters=true This pattern is still bad. But Right now the validation can only recommend to move stuff to "calculate in render" A global setState should not be moved to render, not even conditionally and you can't remove state without crossing Component boundaries, which makes this a different kind of fix. So while we are only suggesting "calculate in render" as a fix we should disallow the lint from throwing in this case IMO Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35135). * __->__ facebook#35135 * facebook#35134 DiffTrain build for [257b033](facebook@257b033)
github-actions bot
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Nov 16, 2025
…ns lint (facebook#35135) Summary: This only matters when enableTreatSetIdentifiersAsStateSetters=true This pattern is still bad. But Right now the validation can only recommend to move stuff to "calculate in render" A global setState should not be moved to render, not even conditionally and you can't remove state without crossing Component boundaries, which makes this a different kind of fix. So while we are only suggesting "calculate in render" as a fix we should disallow the lint from throwing in this case IMO Test Plan: Added a fixture --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35135). * __->__ facebook#35135 * facebook#35134 DiffTrain build for [257b033](facebook@257b033)
Moroshima
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Nov 20, 2025
…#86155) [diff facebook/react@93fc5740...fb2177c1](facebook/react@93fc574...fb2177c) <details> <summary>React upstream changes</summary> - facebook/react#35143 - facebook/react#35145 - facebook/react#35140 - facebook/react#35139 - facebook/react#35062 - facebook/react#35135 - facebook/react#35134 </details>
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Summary:
The validation only allows setState declaration as a usage outside of the effect.
Another edge case is that if you add the setState being validated in the dependency array you also make the validation opt out since it counts as a usage outside of the effect.
Added a bit of logic to consider the effect's deps when creating the cache for setState usages within the effect
Test Plan:
Added a fixture
Stack created with Sapling. Best reviewed with ReviewStack.