/**
 * Adds a new property to an object with a specified key and value.
 * @template T - The type of the object.
 * @param {T} obj - The object to add the property to.
 * @param {string} key - The key of the new property.
 * @param {PropertyDescriptor} descriptor - The property descriptor.
 * @returns {T & Record<K, V>} The object with the added property.
 * @template K - The key type.
 * @template V - The value type.
 */
export declare const addProperty: <T extends object, K extends string, V>(obj: T, key: K, descriptor: {
    get: () => V;
}) => T & Record<K, V>;