import { BucketName, CollectionName, CouchbaseClusterTypes, DocDefMatchingBody, ScopeName } from '@cbjsdev/shared';
import type { Collection } from '../../../collection.js';
import { type NodeCallback, type VoidNodeCallback } from '../../../utilities.js';
/**
 * CouchbaseQueue provides a simplified interface for storing a queue
 * within a Couchbase document.
 *
 * @see {@link Collection.queue}
 * @category Datastructures
 */
export declare class CouchbaseQueue<T extends CouchbaseClusterTypes, B extends BucketName<T>, S extends ScopeName<T, B>, C extends CollectionName<T, B, S>, Key extends DocDefMatchingBody<ReadonlyArray<Item>, T, B, S, C>['Key'], Item> {
    private _coll;
    private _key;
    /**
     * @internal
     */
    constructor(collection: Collection<T, B, S, C>, key: Key);
    /**
     * Returns the number of items in the queue.
     *
     * @param callback A node-style callback to be invoked after execution.
     */
    size(callback?: NodeCallback<number>): Promise<number>;
    /**
     * Adds a new item to the back of the queue.
     *
     * @param value The value to add.
     * @param callback A node-style callback to be invoked after execution.
     */
    push(value: Item, callback?: VoidNodeCallback): Promise<void>;
    /**
     * Removes an item from the front of the queue.
     *
     * @param callback A node-style callback to be invoked after execution.
     */
    pop(callback?: NodeCallback<Item>): Promise<Item>;
}