/** One trailing refresh per mounted conversation, shared by all notification sources. */
export declare class TimelineRefreshScheduler {
    private readonly refresh;
    private readonly delayMillis;
    private pending;
    private readers;
    private generation;
    private timer;
    private retryKey;
    private retries;
    private pendingDelay;
    private dueAt;
    constructor(refresh: () => void, delayMillis?: number);
    request(delayMillis?: number): void;
    /** Only version races are replayed here; transport recovery belongs to the Host. */
    retry(key: string): boolean;
    begin(consumesRefresh: boolean): () => void;
    reset(): void;
    private clearTimer;
    private schedule;
}
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