import { Callable, TaskPriority } from "./types";
/**
 * Internal Task class, for handling executions
 */
export declare class Task {
    private _created;
    private _error;
    private _queuedPromise;
    private _rejectFn;
    private _resolveFn;
    private _stack;
    private _target;
    private _timeLimit;
    private _type;
    /**
     * Constructor for a Task
     * @param {Function|Promise} item The item to enqueue
     * @param {TaskPriority=} type The priority to set
     * @param {String=} stack The stack name
     */
    constructor(item: Callable<any>, type?: TaskPriority, stack?: string | null);
    /**
     * Creation timestamp
     * @type {Number}
     * @readonly
     */
    get created(): number;
    /**
     * Execution error, if one occurred
     * @type {Error | null}
     */
    get error(): Error | null;
    /**
     * Promise which resolves when work has completed
     * @type {Promise}
     */
    get queuedPromise(): Promise<any>;
    /**
     * The stack name
     * @type {String}
     */
    get stack(): string;
    /**
     * The target function
     * @type {Function}
     */
    get target(): Callable<any>;
    /**
     * Current time limit
     * @type {Number}
     */
    get timeLimit(): number;
    /**
     * The task priority type
     * @type {TaskPriority}
     */
    get type(): TaskPriority;
    set timeLimit(newLimit: number);
    /**
     * Execute the task
     * @returns {Promise}
     */
    execute(throws?: boolean): Promise<void>;
}