26 lines
621 B
TypeScript
26 lines
621 B
TypeScript
// @strict: true
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// Repro from #22564
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type A<R> = [R] | [R, string];
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declare function f<T>(x: A<T>): T;
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f([undefined, ''] as [never, string]); // T: never
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f([undefined, ''] as [void, string]); // T: void
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// Repro from #22563
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type B<R, S> = [R] | [R, S];
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declare function g<T, U>(f: B<T, U>): U;
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g([[]] as [void[]]); // U: {}
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type C<R, S> = [R[]] | [R[], S];
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declare function h<T, U>(f: C<T, U>): U;
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h([[]] as [void[]]); // U: {}
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// Repro from #22562
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type C2<R> = [R[]] | [R[], void];
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declare function h2<T>(f: C2<T>): T;
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h2([[]] as [never[]]); // T: never
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h2([[]] as [void[]]); // T: void
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