import { State } from "@typescript-package/state";
/**
 * @description Class designed for asynchronous processing the promises of `void`.
 * @export
 * @class Processing
 * @extends {State<Set<Promise<void>>>} The state for active processing promises, tracking the status of asynchronous operations.
 */
export declare class Processing extends State<Set<Promise<void>>> {
    #private;
    /**
     * @description Tracks whether there are actively processed promises.
     * @public
     * @readonly
     * @type {boolean}
     */
    get active(): boolean;
    /**
     * @description A current number of promises being processed.
     * @public
     * @readonly
     * @type {number}
     */
    get activeCount(): number;
    /**
     * @description Returns the first promise from processing.
     * @public
     * @readonly
     * @type {Promise<void>}
     */
    get first(): Promise<void>;
    /**
     * @description Returns the last promise from processing.
     * @public
     * @readonly
     * @type {Promise<void>}
     */
    get last(): Promise<void>;
    /**
     * Creates a `Processing` object.
     * @constructor
     */
    constructor();
    /**
     * @description Adds the promise to the processing state.
     * @public
     * @param {Promise<void>} promise The promise of `void` to add.
     * @returns {this}
     */
    add(promise: Promise<void>, remove?: boolean): this;
    /**
     * @description Returns `Promise` that waits for the processing completion.
     * @public
     * @async
     * @returns {Promise<void>}
     */
    complete(): Promise<void>;
    /**
     * @description Sets the `Processing` to debug state.
     * @public
     */
    debug(): this;
    /**
     * @description Removes the specified promise from the processing state.
     * @public
     * @param {Promise<void>} promise
     * @returns {this}
     */
    delete(promise?: Promise<void>): this;
    /**
     * @description Checks whether the `Processing` is active.
     * @public
     * @param {?boolean} [expected] An optional `boolean` type value to check the active state.
     * @returns {boolean}
     */
    isActive(expected?: boolean): boolean;
    /**
     * @description Unset the `Processing` from the debug state.
     * @public
     */
    unDebug(): this;
}