import { Event, SessionInterface as Session, SessionsList, SessionService } from './types';
/**
 * Optional configuration for getting a session
 */
export interface GetSessionConfig {
    numRecentEvents?: number;
    afterTimestamp?: number;
}
/**
 * Response for listing events in a session
 */
export interface ListEventsResponse {
    events: Event[];
    nextPageToken?: string;
}
/**
 * Interface for session services with simple method signatures.
 * This interface defines the basic contract for session operations.
 */
export interface IBaseSessionService {
    /**
     * Gets a session by ID.
     */
    getSession(appName: string, userId: string, sessionId: string): Promise<Session | undefined>;
    /**
     * Creates a new session.
     *
     * @param appName The application name
     * @param userId The user ID
     * @param initialState The initial state of the session
     * @returns The created session
     */
    createSession(appName: string, userId: string, initialState?: Record<string, any>): Promise<Session>;
    /**
     * Updates a session's state.
     *
     * @param appName The application name
     * @param userId The user ID
     * @param sessionId The session ID
     * @param stateDelta The changes to apply to the session state
     * @returns The updated session
     */
    updateSessionState(appName: string, userId: string, sessionId: string, stateDelta: Record<string, any>): Promise<Session>;
}
/**
 * Base abstract class for session services.
 * Provides common functionality and defines the interface that concrete implementations must follow.
 */
export declare abstract class BaseSessionService implements SessionService {
    /**
     * Creates a new session.
     *
     * @param options.appName - The name of the app
     * @param options.userId - The ID of the user
     * @param options.sessionId - Optional client-provided session ID
     * @param options.state - Optional initial state
     * @returns A new Session instance
     */
    abstract createSession(options: {
        appName: string;
        userId: string;
        sessionId?: string;
        state?: Record<string, any>;
    }): Promise<Session> | Session;
    /**
     * Gets a session by its ID.
     *
     * @param options.appName - The name of the app
     * @param options.userId - The ID of the user
     * @param options.sessionId - The ID of the session to get
     * @returns The requested Session or null if not found
     */
    abstract getSession(options: {
        appName: string;
        userId: string;
        sessionId: string;
    }): Promise<Session | null> | Session | null;
    /**
     * Lists all sessions for a user in an app.
     *
     * @param options.appName - The name of the app
     * @param options.userId - The ID of the user
     * @returns A list of sessions
     */
    abstract listSessions(options: {
        appName: string;
        userId: string;
    }): Promise<SessionsList> | SessionsList;
    /**
     * Deletes a session.
     *
     * @param options.appName - The name of the app
     * @param options.userId - The ID of the user
     * @param options.sessionId - The ID of the session to delete
     */
    abstract deleteSession(options: {
        appName: string;
        userId: string;
        sessionId: string;
    }): Promise<void> | void;
    /**
     * Lists events in a session.
     *
     * @param options.appName - The name of the app
     * @param options.userId - The ID of the user
     * @param options.sessionId - The ID of the session
     * @returns A list of events in the session
     */
    abstract listEvents(options: {
        appName: string;
        userId: string;
        sessionId: string;
    }): Promise<ListEventsResponse> | ListEventsResponse;
    /**
     * Updates a session's state.
     */
    abstract updateSessionState(appName: string, userId: string, sessionId: string, stateDelta: Record<string, any>): Promise<Session>;
    /**
     * Closes a session.
     *
     * @param options.session - The session to close
     */
    closeSession(options: {
        session: Session;
    }): Promise<void> | void;
    /**
     * Appends an event to a session.
     *
     * @param options.session - The session to append to
     * @param options.event - The event to append
     * @returns The event that was appended
     */
    appendEvent(options: {
        session: Session;
        event: Event;
    }): Promise<void> | void;
    /**
     * Updates the session state based on the event.
     *
     * @param session - The session to update
     * @param event - The event to update from
     */
    private _updateSessionStateFromEvent;
}