/**
 * AST Index Watcher Service
 *
 * Watches the file system for changes and triggers incremental index updates.
 * Uses polling-based approach for broad compatibility.
 */
/**
 * AST Index Watcher — triggers incremental updates on file changes
 */
export declare class ASTIndexWatcherService {
    private debounceTimer;
    private pendingChanges;
    private readonly projectRoot;
    private running;
    private watcher;
    constructor(projectRoot: string);
    /**
     * Start watching for file changes
     */
    start(): void;
    /**
     * Stop watching
     */
    stop(): void;
    /**
     * Check if the watcher is running
     */
    isRunning(): boolean;
    /**
     * Handle a file change event
     */
    private handleFileChange;
    /**
     * Flush pending changes and trigger incremental update
     */
    private flushChanges;
}
export declare function getASTIndexWatcher(projectRoot?: string): ASTIndexWatcherService;
export declare function resetASTIndexWatcher(): void;
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