Mapped and indexed access type fixes - #17455
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Anders Hejlsberg (ahejlsberg)
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Ron Buckton (rbuckton)
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Anders Hejlsberg (@ahejlsberg) this fixes checks that were too loose, but there's been an inverse issue of checks that are too strict as well, see #15768. |
This was referenced Aug 12, 2017
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This PR adds some missing checks related to indexed access types and mapped types. In particular, for an indexed access
T[K]the PR ensures that we always check thatKis assignable tokeyof T. This check was previously not performed whenTis a generic mapped type.Fixes #17238. This PR supercedes #17336, but keeps the tests from that PR.