export interface ViewerEvent {
    event_type: string;
    event_at: string;
    position_seconds?: number;
    payload?: Record<string, unknown>;
    idempotency_key?: string;
}
export interface EventTrackerConfig {
    endpoint: string;
    tokenId: string;
    sessionId?: string;
    eventsSecret: string;
    identityHash?: string;
    flushIntervalMs?: number;
    debug?: boolean;
}
export declare class EventTracker {
    private buffer;
    private config;
    private flushTimer;
    private accumulator;
    private destroyed;
    private _onBeforeUnload;
    private flushBackoff;
    private flushing;
    constructor(config: EventTrackerConfig);
    track(type: string, positionSeconds?: number, payload?: Record<string, unknown>): void;
    startChunk(position: number): void;
    tickChunk(position: number): void;
    endChunk(): void;
    setSessionId(sessionId: string): void;
    flush(): Promise<void>;
    destroy(): void;
    private startAutoFlush;
    private restartAutoFlush;
    private hookPageUnload;
    private sendBatch;
    private randomNonce;
    private sign;
}
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