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lindskogen/pickbyvaluetype.ts

Last active September 18, 2020 20:54
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Typescript Pick by value type
Raw
pickbyvaluetype.ts
type ExtractKeysByValueType<O, V> = {
[P in keyof O]: O[P] extends V ? P : never;
}[keyof O]
type PickByValueType<O, V> = Pick<O, ExtractKeysByValueType<O, V>>
type OmitByValueType<O, V> = Omit<O, ExtractKeysByValueType<O, V>>
// Usage:
interface User {
id: string;
name: string;
age: number;
isAdmin: boolean;
}
// Only the properties in User that are strings
type A = PickByValueType<User, string> // { id: string; name: string }
// Everything but the properties in User that are strings
type B = OmitByValueType<User, string> // { age: number; isAdmin: boolean }
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