import * as plugins from './plugins.js';
import * as interfaces from './interfaces.js';
import type { Bucket } from './classes.bucket.js';
import { EventEmitter } from 'node:events';
/**
 * BucketWatcher monitors a storage bucket for changes (add/modify/delete)
 * using a polling-based approach. Designed to follow the SmartdataDbWatcher pattern.
 *
 * @example
 * ```typescript
 * const watcher = bucket.createWatcher({ prefix: 'uploads/', pollIntervalMs: 3000 });
 *
 * // RxJS Observable pattern
 * watcher.changeSubject.subscribe((change) => {
 *   console.log('Change:', change);
 * });
 *
 * // EventEmitter pattern
 * watcher.on('change', (change) => console.log(change));
 * watcher.on('error', (err) => console.error(err));
 *
 * await watcher.start();
 * await watcher.readyDeferred.promise; // Wait for initial state
 *
 * // Later...
 * await watcher.stop();
 * ```
 */
export declare class BucketWatcher extends EventEmitter {
    /** Deferred that resolves when initial state is built and watcher is ready */
    readyDeferred: plugins.smartpromise.Deferred<unknown>;
    /** Observable for receiving change events (supports RxJS operators) */
    changeSubject: plugins.smartrx.rxjs.Observable<interfaces.IStorageChangeEvent | interfaces.IStorageChangeEvent[]>;
    private rawSubject;
    private previousState;
    private pollIntervalId;
    private isPolling;
    private isStopped;
    private readonly bucketRef;
    private readonly prefix;
    private readonly pollIntervalMs;
    private readonly bufferTimeMs?;
    private readonly includeInitial;
    private readonly pageSize;
    constructor(bucketRef: Bucket, options?: interfaces.IBucketWatcherOptions);
    /**
     * Start watching the bucket for changes
     */
    start(): Promise<void>;
    /**
     * Stop watching the bucket
     */
    stop(): Promise<void>;
    /**
     * Alias for stop() - for consistency with other APIs
     */
    close(): Promise<void>;
    /**
     * Build the initial state by listing all objects with metadata
     */
    private buildInitialState;
    /**
     * Poll for changes by comparing current state against previous state
     */
    private poll;
    /**
     * Detect changes between current and previous state
     */
    private detectChanges;
    /**
     * Emit a change event via both RxJS Subject and EventEmitter
     */
    private emitChange;
    /**
     * List objects with full metadata (ETag, Size, LastModified)
     * This is a private method that yields full _Object data, not just keys
     */
    private listObjectsWithMetadata;
}