/**
 * Checkpoint Service
 *
 * Manages task checkpoints for resumable work sessions.
 * Allows developers to pause and resume tasks without losing context.
 */
import type { Checkpoint, CheckpointIndex } from "../types/checkpoint.js";
/**
 * Service for managing task checkpoints and resumable work sessions.
 *
 * Allows saving, resuming, and managing checkpoints that preserve
 * task context across development sessions.
 */
export declare class CheckpointService {
    private projectRoot;
    private checkpointsPath;
    private indexPath;
    /**
     * @param projectRoot - Root directory of the project
     */
    constructor(projectRoot: string);
    /**
     * Initialize checkpoints directory
     */
    initialize(): Promise<void>;
    /**
     * Save a checkpoint
     */
    saveCheckpoint(checkpoint: Partial<Checkpoint>): Promise<string>;
    /**
     * Load a checkpoint by ID
     */
    loadCheckpoint(checkpointId: string): Promise<Checkpoint | null>;
    /**
     * Get the latest checkpoint
     */
    getLatestCheckpoint(): Promise<Checkpoint | null>;
    /**
     * List all checkpoints
     */
    listCheckpoints(limit?: number): Promise<CheckpointIndex["checkpoints"]>;
    /**
     * Clear a checkpoint
     */
    clearCheckpoint(checkpointId: string): Promise<boolean>;
    /**
     * Clear all checkpoints
     */
    clearAllCheckpoints(): Promise<number>;
    /**
     * Mark checkpoint as active/inactive
     */
    setCheckpointActive(checkpointId: string, isActive: boolean): Promise<void>;
    /**
     * Update index with new checkpoint
     */
    private updateIndex;
    /**
     * Format checkpoint as resume context
     */
    formatCheckpointAsContext(checkpoint: Checkpoint): string;
}
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