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Merge pull request #23067 from Microsoft/fixTPReferenceInConditional

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Fix type parameter reference checks in conditional types
This commit is contained in:
Anders Hejlsberg
2018-04-02 17:30:32 -07:00
committed by GitHub
parent e6fa4e4415 c2f96a3c7d
commit 751eab9eed
6 changed files with 233 additions and 6 deletions
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15
tests/cases/conformance/types/conditional/conditionalTypes2.ts
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@@ -121,3 +121,18 @@ function foo<T>(value: T) {
toString2(value);
}
}
// Repro from #23052
type A<T, V, E> =
T extends object
? { [Q in { [P in keyof T]: T[P] extends V ? P : P; }[keyof T]]: A<T[Q], V, E>; }
: T extends V ? T : never;
type B<T, V> =
T extends object
? { [Q in { [P in keyof T]: T[P] extends V ? P : P; }[keyof T]]: B<T[Q], V>; }
: T extends V ? T : never;
type C<T, V, E> =
{ [Q in { [P in keyof T]: T[P] extends V ? P : P; }[keyof T]]: C<T[Q], V, E>; };