Add inference priority for mapped type keys #22246
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weswigham
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src/compiler/types.ts
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| AlwaysStrict = 1 << 4, // Always use strict rules for contravariant inferences | ||
| NakedTypeVariable = 1 << 0, // Naked type variable in union or intersection type | ||
| HomomorphicMappedType = 1 << 1, // Reverse inference for hoimomorphic mapped type | ||
| MappedType = 1 << 2, // Reverse inference for mapped type |
|
@DanielRosenwasser done. Build break is fixed by #22247 |
The new priority causes union inference, similarly to return type
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src/compiler/types.ts
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| NoConstraints = 1 << 3, // Don't infer from constraints of instantiable types | ||
| AlwaysStrict = 1 << 4, // Always use strict rules for contravariant inferences | ||
| NakedTypeVariable = 1 << 0, // Naked type variable in union or intersection type | ||
| HomomorphicMappedType = 1 << 1, // Reverse inference for hoimomorphic mapped type |
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typo: homomorphic.
Also I think it would be more accurate to say "inference made to a reverse" instead of "reverse inference for" on this line and the next.
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The new priority causes union inference, similar to the return type inference priority.
Fixes #22242