export declare const DESKTOP_SESSION_LEASE_MS = 30000;
/** Browser selection is ephemeral; it is neither session history nor run state. */
export declare class DesktopSessionPresence {
    private readonly windows;
    private selected;
    private revision;
    private selectedAt;
    clear(): void;
    snapshot(now: number): {
        sessionRef: string | undefined;
        revision: number;
        selectedAt: number | undefined;
    };
    expiryDelay(now: number): number | undefined;
    report(input: {
        windowRef: string;
        revision: number;
        sessionRef: string | null;
        focused?: boolean;
    }, now: number, wallTime?: number): void;
    current(now: number): string | undefined;
    private prune;
}
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