@monstermann/fn/dist/object/hasProp.d.ts

A utility library for TypeScript.

import { KeysOfUnion, Simplify } from "type-fest";

//#region src/object/hasProp.d.ts
type HasProp<T extends object, U extends KeysOfUnion<T>> = T extends unknown ? U extends keyof T ? Simplify<T & Record<U, Exclude<Required<T>[U], null | undefined>>> : never : never;
/**
 * `hasProp(target, key)`
 *
 * Checks if `target` object has the specified `key` property with a non-null and non-undefined value.
 *
 * ```ts
 * hasProp({ a: 1, b: null }, "a"); // true
 * hasProp({ a: 1, b: null }, "b"); // false
 * ```
 *
 * ```ts
 * pipe({ a: 1, b: null }, hasProp("a")); // true
 * pipe({ a: 1, b: null }, hasProp("b")); // false
 * ```
 */
declare const hasProp: {
  <T extends object, U extends KeysOfUnion<T>>(key: U): (target: T) => target is HasProp<T, U>;
  <T extends object, U extends KeysOfUnion<T>>(target: T, key: U): target is HasProp<T, U>;
};
//#endregion
export { hasProp };