import { Task } from './task';
/**
 * Interface for task persistence
 * Allows abstraction of how tasks are stored and retrieved
 */
export interface TaskPersistence<TIn, TOut> {
    /**
     * Add a task to persistence
     */
    enqueue(task: Task<TIn, TOut>): void;
    /**
     * Retrieve and remove the next task
     */
    dequeue(): Task<TIn, TOut> | undefined;
    /**
     * Get the number of tasks in persistence
     */
    size(): number;
    /**
     * Clear all tasks from persistence
     */
    clear(): void;
}
/**
 * Default in-memory task persistence implementation
 */
export declare class InMemoryTaskPersistence<TIn, TOut> implements TaskPersistence<TIn, TOut> {
    protected tasks: Task<TIn, TOut>[];
    enqueue(task: Task<TIn, TOut>): void;
    dequeue(): Task<TIn, TOut> | undefined;
    protected isTaskReady(index: number): boolean;
    size(): number;
    clear(): void;
}