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Exclude doesn't work with generics #21941

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cevek opened this issue Feb 14, 2018 · 3 comments
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Exclude doesn't work with generics #21941

cevek opened this issue Feb 14, 2018 · 3 comments
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@cevek
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cevek commented Feb 14, 2018

TypeScript Version: 2.8.0-dev.20180214

Code

type A = { A: number; B: number };
type ExcludeB<T> = Exclude<keyof T, 'B'>;
type B = ExcludeB<A>; // 'A' | 'B'
type C = Exclude<keyof A, 'B'>; // 'A'

function stripB<T>(key: T): Pick<T, Exclude<keyof T, 'B'>> {
    return null!;
}
stripB({A: 1, B: 1}) // -> {A: number, B: number}
@jcalz
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jcalz commented Feb 14, 2018

Duplicate of #21929 ?

@ahejlsberg
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Duplicate of #21862.

@ahejlsberg ahejlsberg added the Duplicate An existing issue was already created label Feb 14, 2018
@typescript-bot
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Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.

@microsoft microsoft locked and limited conversation to collaborators Jul 3, 2018
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