import type { SessionEvent } from "@opengeni/sdk";
export declare const SESSION_ATTENTION_EVENT_TYPES: ReadonlySet<string>;
/**
 * The latest delivered attention boundary, independent of raw token activity.
 * A foreground reader acknowledges through this sequence, so streaming flushes
 * never cause a personal-state write and later activity stays unread.
 */
export declare function sessionAttentionReadThroughSequence(events: readonly SessionEvent[]): number;
/**
 * Where an open conversation should be acknowledged through, and whether it
 * needs it: the server says unread, or a newer attention boundary has been
 * delivered since the session row was read. The frontier never moves for
 * streaming activity, so a reader writes personal state once per boundary.
 */
export declare function readAcknowledgementFrontier(session: {
    unread?: boolean | undefined;
    lastSequence?: number | undefined;
} | null | undefined, attentionThrough: number): {
    readThrough: number;
    unread: boolean;
};