/**
 * Worktree Stats Tracker - Event-driven worktree usage statistics
 *
 * Subscribes to ExplorationEventEmitter and accumulates stats for session tracking
 */
import type { WorktreeUsageStats } from '../types/session.types.js';
export declare class WorktreeStatsTracker {
    private activeWorktrees;
    private explorationIds;
    private listeners;
    private maxConcurrent;
    private totalCreated;
    private totalDurationMs;
    private worktreeSummaries;
    /**
     * Subscribe to exploration events
     */
    subscribe(): void;
    /**
     * Unsubscribe from all exploration events
     */
    unsubscribe(): void;
    /**
     * Get current worktree usage statistics snapshot
     */
    getStats(): WorktreeUsageStats;
    private findSummary;
    private finishWorktree;
    private handleWorktreeCompleted;
    private handleWorktreeCreated;
    private handleWorktreeFailed;
    private handleWorktreeStarted;
}
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