[WIP] Remove unnecessary weak types when reporting errors #25145
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… whole) types when reporting errors. Summary: When a source type still isn't assignable to an intersection with all the weak types removed, we can generally assume that the "strong" types are the ones that are more interesting to report on. As an improvement, we try to keep them around and remove weak types which we believe will cause noise.
DanielRosenwasser
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| tests/cases/compiler/errorsOnWeakTypeIntersectionTargets01.ts(10,12): error TS2322: Type '{ a: number; b: number; }' is not assignable to type 'A & B'. | |||
| Type '{ a: number; b: number; }' is not assignable to type 'B'. | |||
| Type '{ a: number; b: number; }' is not assignable to type 'B'. | |||
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This seems bad.
DanielRosenwasser
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Closing for housekeeping 🧹 |
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Ignore for now - I've made some changes that actually make errors worse.
Fixes #24146.When a source type still isn't assignable to an intersection with all the weak types removed, we can generally assume that the "strong" types are the ones that are more interesting to report on. As an improvement, we try to keep them around and remove weak types which we believe will cause noise.While this sometimes has undesirable effects when there are incompatibilities among strong types and weak types, this by and large gives better behavior when dealing with types like JSX'sIntrinsicAttributes.