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Add regression test

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This commit is contained in:
Anders Hejlsberg 2018-04-24 10:02:47 -07:00
parent e71afc32ad
commit 57ef618120
1 changed files with 9 additions and 0 deletions
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9
tests/cases/conformance/types/keyof/keyofAndIndexedAccess.ts
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@ -567,3 +567,12 @@ function f3<T, K extends Extract<keyof T, string>>(t: T, k: K, tk: T[K]): void {
type Predicates<TaggedRecord> = {
[T in keyof TaggedRecord]: (variant: TaggedRecord[keyof TaggedRecord]) => variant is TaggedRecord[T]
}
// Repros from #23592
type Example<T extends { [K in keyof T]: { prop: any } }> = { [K in keyof T]: T[K]["prop"] };
type Result = Example<{ a: { prop: string }; b: { prop: number } }>;
type Helper2<T> = { [K in keyof T]: Extract<T[K], { prop: any }> };
type Example2<T> = { [K in keyof Helper2<T>]: Helper2<T>[K]["prop"] };
type Result2 = Example2<{ 1: { prop: string }; 2: { prop: number } }>;