[compiler] Cleanup and enable validateNoVoidUseMemo #34882
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This was referenced Oct 16, 2025
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Two additional validations for useMemo: * Disallow reassigning to values declared outside the useMemo callback (always on) * Disallow unused useMemo calls (part of the validateNoVoidUseMemo feature flag, which in turn is off by default) We should probably enable this flag though! --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34868). * #34855 * #34882 * __->__ #34868
This is a great validation, so let's enable by default. Changes: * Move the validation logic into ValidateUseMemo alongside the new check that the useMemo result is used * Update the lint description * Make the void memo errors lint-only, they don't require us to skip compilation (as evidenced by the fact that we've had this validation off)
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Two additional validations for useMemo: * Disallow reassigning to values declared outside the useMemo callback (always on) * Disallow unused useMemo calls (part of the validateNoVoidUseMemo feature flag, which in turn is off by default) We should probably enable this flag though! --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34868). * #34855 * #34882 * __->__ #34868 DiffTrain build for [7f5ea1b](7f5ea1b)
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Two additional validations for useMemo: * Disallow reassigning to values declared outside the useMemo callback (always on) * Disallow unused useMemo calls (part of the validateNoVoidUseMemo feature flag, which in turn is off by default) We should probably enable this flag though! --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34868). * #34855 * #34882 * __->__ #34868 DiffTrain build for [7f5ea1b](7f5ea1b)
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This is a great validation, so let's enable by default. Changes: * Move the validation logic into ValidateUseMemo alongside the new check that the useMemo result is used * Update the lint description * Make the void memo errors lint-only, they don't require us to skip compilation (as evidenced by the fact that we've had this validation off) --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34882). * #34855 * __->__ #34882 DiffTrain build for [1324e1b](1324e1b)
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This is a great validation, so let's enable by default. Changes: * Move the validation logic into ValidateUseMemo alongside the new check that the useMemo result is used * Update the lint description * Make the void memo errors lint-only, they don't require us to skip compilation (as evidenced by the fact that we've had this validation off) --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34882). * #34855 * __->__ #34882 DiffTrain build for [1324e1b](1324e1b)
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This is a great validation, so let's enable by default. Changes:
Stack created with Sapling. Best reviewed with ReviewStack.