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Add regression test

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This commit is contained in:
Anders Hejlsberg
2018-08-22 07:16:31 -07:00
parent 84d1e9f22f
commit 74c57caa90
1 changed files with 8 additions and 0 deletions
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8
tests/cases/conformance/types/mapped/mappedTypesArraysTuples.ts
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@@ -85,3 +85,11 @@ declare function mapArray<T extends any[]>(arr: T): Mapped<T>;
function acceptMappedArray<T extends any[]>(arr: T) {
acceptArray(mapArray(arr));
}
// Repro from #26163
type Unconstrained<T> = ElementType<Mapped<T>>;
type T1 = Unconstrained<[string, number, boolean]>; // string | number | boolean
type Constrained<T extends any[]> = ElementType<Mapped<T>>;
type T2 = Constrained<[string, number, boolean]>; // string | number | boolean