/**
 * File Watcher Service - Monitor skills and photons directories for changes
 *
 * Watches ~/.ncp/skills/ and ~/.ncp/photons/ directories and triggers
 * incremental index updates when files are added, modified, or deleted.
 * Uses PhotonWatcher from photon-core for cross-platform support (Windows, macOS, Linux).
 */
export interface FileWatchEvent {
    type: 'add' | 'change' | 'unlink';
    filePath: string;
    fileName: string;
    directory: 'skills' | 'photons';
}
export interface FileWatcherCallbacks {
    onSkillAdded?: (fileName: string, filePath: string) => Promise<void>;
    onSkillModified?: (fileName: string, filePath: string) => Promise<void>;
    onSkillRemoved?: (fileName: string) => Promise<void>;
    onPhotonAdded?: (fileName: string, filePath: string) => Promise<void>;
    onPhotonModified?: (fileName: string, filePath: string) => Promise<void>;
    onPhotonRemoved?: (fileName: string) => Promise<void>;
    onError?: (error: Error) => void;
}
export declare class FileWatcher {
    private photonWatcher;
    private callbacks;
    private isInitialized;
    private debounceTimers;
    private debounceMs;
    private batchOperations;
    private batchStartTime;
    private batchCompletionTimer;
    private readonly BATCH_COMPLETION_WINDOW_MS;
    private readonly BATCH_SIZE_THRESHOLD;
    private metrics;
    private static IGNORE_PATTERNS;
    constructor(callbacks?: FileWatcherCallbacks, debounceMs?: number);
    /**
     * Check if a file should be ignored
     */
    private shouldIgnoreFile;
    /**
     * Debounce file event processing
     */
    private debounceEvent;
    /**
     * Track file operation for batch detection
     */
    private trackBatchOperation;
    /**
     * Complete batch and log metrics
     */
    private completeBatch;
    /**
     * Get FileWatcher metrics
     */
    getMetrics(): typeof this.metrics;
    /**
     * Start watching for file changes in skills and photons directories
     */
    start(): Promise<void>;
    /**
     * Stop watching for file changes
     */
    stop(): Promise<void>;
    /**
     * Handle skill directory events
     */
    private handleSkillEvent;
    /**
     * Handle photon directory events
     */
    private handlePhotonEvent;
    /**
     * Check if watcher is initialized
     */
    isRunning(): boolean;
}
export declare function getFileWatcher(callbacks?: FileWatcherCallbacks): FileWatcher;
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