/**
 * Walk an object's prototype chain looking for a property descriptor.
 *
 * @param target - Object to start the walk from.
 * @param key - Property key to look up.
 * @returns The closest descriptor found, or `undefined` when none of
 * the prototypes declare the key.
 *
 * @internal
 */
export declare function findDescriptor(target: object, key: PropertyKey): PropertyDescriptor | undefined;