Type Alias KeyWithValueType<T, Allowed>

KeyWithValueType: { [K in keyof T]: T[K] extends Allowed ? K : never }[keyof T]

KeyWithValueType is the keys from a given a Record type whose values are of a type that extends Allowed.

Type Parameters

T extends Record<any, any>
Allowed

Example: Example

type Obj = {
    a: number;
    b: number;
    c: string;
    d: boolean;
}

KeyWithValueType<Obj, number> // "a" | "b"
KeyWithValueType<Obj, string | boolean> // "c" | "d"

Typeparam

T The record type with keys.

Typeparam

Allowed The allowed value type.