/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
import { ReactiveElement } from '../reactive-element.js';
/**
 * A property decorator that converts a class property into a getter that
 * returns a promise that resolves to the result of a querySelector on the
 * element's renderRoot done after the element's `updateComplete` promise
 * resolves. When the queried property may change with element state, this
 * decorator can be used instead of requiring users to await the
 * `updateComplete` before accessing the property.
 *
 * @param selector A DOMString containing one or more selectors to match.
 *
 * See: https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector
 *
 * ```ts
 * class MyElement {
 *   @queryAsync('#first')
 *   first;
 *
 *   render() {
 *     return html`
 *       <div id="first"></div>
 *       <div id="second"></div>
 *     `;
 *   }
 * }
 *
 * // external usage
 * async doSomethingWithFirst() {
 *  (await aMyElement.first).doSomething();
 * }
 * ```
 * @category Decorator
 */
export declare function queryAsync(selector: string): (protoOrDescriptor: ReactiveElement | import("./base.js").ClassElement, name?: PropertyKey | undefined) => any;
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