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ValentinFunk/discriminate.ts

Created April 9, 2019 16:51
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  1. ValentinFunk created this gist Apr 9, 2019.
    10 changes: 10 additions & 0 deletions discriminate.ts
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,10 @@
    export type Discriminate<
    Union,
    Prop extends keyof Union,
    Discriminator extends Union[Prop],
    > = Union extends { [T in Prop]: Extract<Union[Prop], Discriminator> } ? Union : never;

    export type DiscriminateByType<
    Union extends { type: any },
    D extends Union['type']
    > = Discriminate<Union, 'type', D>;