23 lines
575 B
TypeScript
23 lines
575 B
TypeScript
// @strictNullChecks: true
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// @declaration: true
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// Repros from #17238
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type AB = {
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a: 'a'
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b: 'a'
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};
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type T1<K extends keyof AB> = { [key in AB[K]]: true };
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type T2<K extends 'a'|'b'> = T1<K>[K]; // Error
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type R = AB[keyof AB]; // "a"
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type T3 = { [key in R]: true };
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type T4<K extends 'a'|'b'> = T3[K] // Error
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type T5<S extends 'a'|'b'|'extra'> = {[key in AB[S]]: true}[S]; // Error
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type T6<S extends 'a'|'b', L extends 'a'|'b'> = {[key in AB[S]]: true}[L]; // Error
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type T7<S extends 'a'|'b', L extends 'a'> = {[key in AB[S]]: true}[L];
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