/**
 * MCP Task Store (spec v2025-11-25)
 *
 * File-based persistence at ~/.photon/tasks/.
 * Each task is a JSON file: {taskId}.json
 * EventEmitter for state change notifications.
 */
import { EventEmitter } from 'events';
import { type Task } from './types.js';
/** Event emitter for task state changes */
export declare const taskEvents: EventEmitter<[never]>;
export declare function registerController(taskId: string, controller: AbortController): void;
export declare function unregisterController(taskId: string): void;
export declare function getController(taskId: string): AbortController | undefined;
export declare function createTask(photon: string, method: string, params?: Record<string, unknown>, ttl?: number): Task;
export declare function getTask(id: string): Task | null;
export declare function updateTask(id: string, updates: Partial<Pick<Task, 'state' | 'statusMessage' | 'progress' | 'result' | 'error' | 'input'>>): Task | null;
export declare function listTasks(photon?: string): Task[];
/**
 * Clean expired task records.
 *
 * Only terminal task records are eligible. Active tasks may legitimately wait
 * for long-running work or user input, so cleanup must not remove them merely
 * because their retention window has elapsed.
 */
export declare function cleanExpiredTasks(ttlOverride?: number): number;
/** Return the current tasks dir — resolves per call so tests can switch PHOTON_DIR. */
export declare function _getTasksDir(): string;
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