keyof

@nick/is/keyof

isKeyOf

Signature

function isKeyOf<T extends {}, K extends PropertyKey = keyof T>(
  o: T,
  k: K,
): k is K & keyof T;

Category

Objects

Examples

import { isKeyOf } from "jsr:@nick/is/keyof";

const obj = { a: 1, b: 2, c: 3 };

console.log(isKeyOf(obj, "a")); // true
console.log(isKeyOf(obj, "b")); // true
console.log(isKeyOf(obj, "c")); // true
console.log(isKeyOf(obj, "d")); // false