import HackleCore from "../../HackleCore";
import { UserManager } from "../user/UserManager";
import { Engagement } from "./Engagement";
import { EngagementListener } from "./EngagementListener";
export declare class EngagementEventTracker implements EngagementListener {
    private readonly core;
    private readonly userManager;
    private static readonly ENGAGEMENT_EVENT_KEY;
    private static readonly ENGAGEMENT_TIME_PROPERTY_KEY;
    constructor(core: HackleCore, userManager: UserManager);
    onEngagement(engagement: Engagement, timestamp: number): void;
}