/**
 * Event Queue for ConversionIQ SDK
 * Handles batching, persistence, and intelligent retry logic for events
 */
import { ConversionIQConfig } from '../types/index';
import { NetworkManager } from './NetworkManager';
export declare class EventQueue {
    private config;
    private networkManager;
    private queue;
    private isProcessing;
    private processingInterval;
    private persistenceKey;
    private readonly maxQueueSize;
    private readonly maxRetries;
    private readonly retentionHours;
    constructor(config: ConversionIQConfig, networkManager: NetworkManager);
    /**
     * Enqueue an event for processing
     */
    enqueue(payload: any, priority?: 'low' | 'normal' | 'high'): Promise<void>;
    /**
     * Flush all events immediately
     */
    flush(): Promise<void>;
    /**
     * Get queue statistics
     */
    getStats(): {
        queueSize: number;
        isProcessing: boolean;
        highPriorityCount: number;
        failedEventCount: number;
    };
    /**
     * Start periodic queue processing
     */
    private startProcessing;
    /**
     * Process the event queue
     */
    private processQueue;
    /**
     * Handle failed events - add back to queue with retry logic
     */
    private handleFailedEvents;
    /**
     * Handle a single failed event
     */
    private handleFailedEvent;
    /**
     * Sort queue by priority and retry time
     */
    private sortQueue;
    /**
     * Load persisted events from storage
     */
    private loadPersistedEvents;
    /**
     * Persist queue to storage
     */
    private persistQueue;
    /**
     * Clear persisted queue
     */
    private clearPersistedQueue;
    /**
     * Setup page unload handler for final flush
     */
    private setupUnloadHandler;
    /**
     * Chunk array into smaller batches
     */
    private chunkArray;
    /**
     * Generate unique event ID
     */
    private generateEventId;
    /**
     * Clean up and stop processing
     */
    destroy(): void;
}
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