[compiler] Improve more error messages #33758
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This was referenced Jul 10, 2025
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| @@ -36,8 +36,10 @@ function Component() { | |||
| ## Error | |||
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| ``` | |||
| Found 2 errors: | |||
| Error: This argument is a function which may reassign or mutate local variables after render, which can cause inconsistent behavior on subsequent renders. Consider using state instead | |||
| Found 1 error: | |||
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Nice! Now we get a single diagnostic with two details (and their associated loc) 🙌
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Enable more validations to help catch bad patterns, but only in the linter. These rules are already enabled by default in the compiler _if_ violations could produce unsafe output. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33752). * #33981 * #33777 * #33767 * #33765 * #33760 * #33759 * #33758 * #33751 * __->__ #33752 * #33753
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Work in progress, i'm experimenting with revamping our diagnostic infra. Starting with a better format for representing errors, with an ability to point ot multiple locations, along with better printing of errors. Of course, Babel still controls the printing in the majority case so this still needs more work. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33751). * #33981 * #33777 * #33767 * #33765 * #33760 * #33759 * #33758 * __->__ #33751 * #33752 * #33753
This PR uses the new diagnostic type for most of the error messages produced in our explicit validation passes (`Validation/` directory). One of the validations produced multiple errors as a hack to showing multiple related locations, which we can now consolidate into a single diagnostic.
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…33759) Uses the new diagnostic infrastructure for this validation, which lets us provide a more targeted message on the text that we highlight (eg "This dependency may be mutated later") separately from the overall error message. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33759). * #33981 * #33777 * #33767 * #33765 * #33760 * __->__ #33759 * #33758
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Enable more validations to help catch bad patterns, but only in the linter. These rules are already enabled by default in the compiler _if_ violations could produce unsafe output. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33752). * #33981 * #33777 * #33767 * #33765 * #33760 * #33759 * #33758 * #33751 * __->__ #33752 * #33753 DiffTrain build for [0d39496](0d39496)
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Enable more validations to help catch bad patterns, but only in the linter. These rules are already enabled by default in the compiler _if_ violations could produce unsafe output. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33752). * #33981 * #33777 * #33767 * #33765 * #33760 * #33759 * #33758 * #33751 * __->__ #33752 * #33753 DiffTrain build for [0d39496](0d39496)
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This PR uses the new diagnostic type for most of the error messages produced in our explicit validation passes (
Validation/directory). One of the validations produced multiple errors as a hack to showing multiple related locations, which we can now consolidate into a single diagnostic.Stack created with Sapling. Best reviewed with ReviewStack.