import TaskQueueCore, { TaskQueueCoreProps } from './core';
import { Task, TaskId, TaskPrioritizationMode, TaskPriority, TaskStatus, TaskStatusUpdateHandler, WaitedTask } from './type';
export interface TaskQueueBaseProps extends TaskQueueCoreProps {
    /**
     * Toggle to make getTask() and getAllTasks() available to retrieve task
     * details.
     * @default false
     */
    memorizeTasks?: boolean;
    /**
     * Toggle to stop the queue when error happens during task execution.
     * @default true
     */
    stopOnError?: boolean;
    /**
     * Toggle to use default incremental task id.
     * @default true
     */
    defaultIncrementalTaskId?: boolean;
    /**
     * Pending task prioritization mode. It affects how the task queue
     * picks the next task to be executed.
     *
     * @augments head - Pick the first task in the waiting queue
     *
     * @augments tail - Pick the last task in the waiting queue
     *
     * @augments head-with-truncation - Pick the first task in the waiting queue
     * and clear the corresponding waiting queue. If the picked task is in the
     * normal waiting queue, then only the normal queue will be cleared; same
     * thing happens to the prioritized waiting queue
     *
     * @augments tail-with-truncation - Pick the last task in the waiting queue
     * and clear the corresponding waiting queue. If the picked task is in the
     * normal waiting queue, then only the normal queue will be cleared; same
     * thing happens to the prioritized waiting queue
     */
    taskPrioritizationMode?: TaskPrioritizationMode;
}
/**
 * Base task queue with abstract methods implementation and base public methods.
 */
export declare class TaskQueueBase extends TaskQueueCore {
    /** @internal */
    protected memorizeTasks: boolean;
    /** @internal */
    protected stopOnError: boolean;
    /** @internal */
    protected defaultIncrementalTaskId: boolean;
    /** @internal */
    protected retrying: boolean;
    /** @internal */
    protected stopped: boolean;
    /** @internal */
    protected promiseQueueCapacity: number;
    /** @internal */
    protected taskPrioritizationMode: TaskPrioritizationMode;
    /** @internal */
    protected tasksWaitingQueue: Array<WaitedTask>;
    /** @internal */
    protected prioritizedTasksWaitingQueue: Array<WaitedTask>;
    /** @internal */
    protected failedRetryableTaskQueue: Array<Task>;
    /** @internal */
    protected taskLookup: Record<TaskId, Task>;
    constructor({ memorizeTasks, stopOnError, defaultIncrementalTaskId, taskPrioritizationMode, ...rest }?: TaskQueueBaseProps);
    /** @internal */
    protected _getAvailablePromiseQueue(): import("./type").PromiseQueue | null;
    /** @internal */
    protected _pushTaskToWaitingQueue(task: WaitedTask): void;
    /** @internal */
    protected _getNextTask(previousTaskHasRun: boolean): Task<any> | null | undefined;
    /** @internal */
    protected _shouldStop(task?: Task): boolean;
    /** @internal */
    protected _createTask<ReturnType>(callback: () => ReturnType | Promise<ReturnType>, taskId?: TaskId, onStatusUpdate?: TaskStatusUpdateHandler<ReturnType>, priority?: TaskPriority): {
        taskId: TaskId;
        callback: () => ReturnType | Promise<ReturnType>;
        createdAt: number;
        status: TaskStatus;
        onStatusUpdate: TaskStatusUpdateHandler<ReturnType> | undefined;
        priority: TaskPriority;
    };
    /**
     * Start the queue execution.
     */
    start(): void;
    /**
     * Stop the queue execution.
     * Please note, the current ongoing task will not be stopped immediately.
     */
    stop(): void;
    /**
     * Retry running the queue with failed tasks.
     * Please note, this method will be effective only when marking "stopOnError"
     * as "true" for the queue.
     */
    retry(): void;
    /**
     * Check if the queue is manually stopped.
     */
    isManuallyStopped(): boolean;
}
export default TaskQueueBase;