code: function patchPromise() {
    const props = {};
    for (let method of methods) {
      if (Promise.prototype[method.name] && Promise.prototype[method.name] !== method) {
        throw new Error('`Promise` already defines method `' + method.name + '`');
      }
      props[method.name] = {
        configurable: true,
        enumerable: false,
        writable: true,
        value: method
      };
    }
    Object.defineProperties(Promise.prototype, props);
  }
docs: Patches the global `Promise` built-in to define `asCallback` and others as instance methods,
  so you can do e.g. `Promise.resolve(true).asCallback(cb)`.
  
  Idempotent.
  
  @throws {Error} If `Promise` already defines one or more of the instance methods.