Constrain infer type parameters made to preserve distributivity for … #49793
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…inlined homomorphic mapped types
typescript-bot
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Author: Team
For Milestone Bug
weswigham
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sandersn
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Jul 6, 2022
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…inlined homomorphic mapped types
After multiple levels of inlinings, constraints can be lost when they're not carried forward because of a semi-circular (not directly circular by our detection logic, but definitely self-referential in a deferred way) type parameter constraint. By going back to the original declaration and copying that type parameter's constraint forward into the
infertype we're making, we can avoid losing the constraint information in the declaration file.Fixes #49591