export = extendPromise;
/**
 * Extends a {@link Promise} by injecting custom properties using a {@link Proxy}. The
 * custom properties will be available on the promise chain no matter how many `then`s,
 * `catch`s or `finally`s are added.
 *
 * @param {Promise} promise     The promise to extend.
 * @param {Object}  properties  A dictionary of custom properties to _inject_ in the
 *                              promise chain.
 * @returns {Proxy<Promise>}
 * @throws {Error} If `promise` is not a valid instance of {@link Promise}.
 * @throws {Error} If `properties` is not an object or if it doesn't have any
 *                 properties.
 * @tutorial extendPromise
 */
declare function extendPromise(promise: Promise<any>, properties: any): ProxyConstructor;