import { type DocumentPresenceSnapshot } from "../realtime/index.js";
/**
 * In-memory, process-local roster of live document participants. Presence is an
 * ephemeral delivery hint with per-entry expiry, never durable state, so a restart
 * simply empties the roster and clients re-announce on their next heartbeat.
 */
export declare class DocumentPresenceTracker {
    private readonly rosters;
    /**
     * Applies one revision-gated presence announcement. Returns false when a newer
     * revision for the same participant has already been observed.
     */
    update(snapshot: DocumentPresenceSnapshot, now: number): boolean;
    /** Lists the still-unexpired participants of one document. */
    list(documentId: string, now: number): DocumentPresenceSnapshot[];
    /** Drops every participant of a deleted document. */
    remove(documentId: string): void;
}
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