export interface EventQueueConfig {
    projectId: string;
    endpoint?: string;
    onDebugLog?: (message: string) => void;
}
export declare class EventQueue {
    private static instance;
    private eventQueue;
    private flushTimeoutId;
    private config;
    private readonly MAX_BATCH_SIZE;
    private readonly FLUSH_INTERVAL;
    private readonly MAX_RETRIES;
    private readonly DEFAULT_ENDPOINT;
    private constructor();
    static getInstance(config: EventQueueConfig): EventQueue;
    private logDebug;
    private setupEventListeners;
    addEvent(eventName: string, properties: Record<string, any>): void;
    private scheduleFlush;
    private flushEvents;
}