/*!
 * This source file is part of the Gel open source project.
 *
 * Copyright 2020-present MagicStack Inc. and the Gel authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
export declare class LifoQueue<T> {
    private _promises;
    private _resolvers;
    private _rejecters;
    constructor();
    private _add;
    push(item: T): void;
    get(): Promise<T>;
    cancelAllPending(err: Error): void;
    get length(): number;
    get pending(): number;
}