import type { Activity, ActivityType } from '../../../shared/activity.js';
export interface ActivityRecordInput {
    createdAt?: string;
    payload?: Record<string, unknown>;
    type: ActivityType;
}
export declare class ActivityStore {
    private readonly agentId;
    constructor(agentId: string);
    record(input: ActivityRecordInput): Promise<Activity>;
    readAll(): Promise<Activity[]>;
    /** Read the last `n` activity records without loading the full log file. */
    readLastN(n: number): Promise<Activity[]>;
    /**
     * Read the newest `n` records matching a predicate, scanning segments
     * newest-first and stopping as soon as `n` matches are found. Returns
     * newest-first. Avoids loading the full log when the match is recent.
     */
    readNewestMatching(n: number, matches: (activity: Activity) => boolean): Promise<Activity[]>;
    readNewestUntil(shouldStop: (activity: Activity) => boolean): Promise<Activity[]>;
    /**
     * Read the last `n` activity records with `createdAt` strictly before the
     * given ISO timestamp cursor. Used for cursor-based backward pagination.
     * Returns oldest-first within the page.
     */
    readBefore(beforeCreatedAt: string, n: number): Promise<Activity[]>;
    private log;
}
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