Add [Constructor]Parameters types to lib.d.ts #26243
Merged
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Based on #26042 and discussion from the most recent design meeting. Thanks @anurbol for creating the initial PR.
It turns out that our tests have a couple of examples of looser definitions of
Parameters
. The differences are instructive:This looser definition allows:
Function
to create an array of parametersany[]
.T extends any[]
to be used as the type of rest parameters.(1) is pretty questionable and is fine to disallow, I think. (2) is now handled by
Parameters
vsConstructorParameters
. (3) is unsound, as pointed out in #26013, since it is equivalent to allowing the assignability ofT extends any[]
toany[]
. So I think all 3 differences are improvements. I preserved them in the test baselines.Fixes #26019