import { Content } from '../models/base_llm';
import { Event } from '../events/event';
/**
 * Represents a series of interactions between a user and agents.
 */
export declare class Session {
    /**
     * The unique identifier of the session.
     */
    id: string;
    /**
     * The name of the app.
     */
    appName: string;
    /**
     * The id of the user.
     */
    userId: string;
    /**
     * The state of the session.
     */
    state: Record<string, unknown>;
    /**
     * The events of the session, e.g., user input, model response, function call/response, etc.
     */
    events: Event[];
    /**
     * The last update time of the session (Unix timestamp in milliseconds).
     */
    lastUpdateTime: number;
    /**
     * Creates a new Session.
     *
     * @param data The session data
     */
    constructor(data: {
        id: string;
        appName: string;
        userId: string;
        state?: Record<string, unknown>;
        events?: Event[];
        lastUpdateTime?: number;
    });
    /**
     * Adds an event to the session.
     *
     * @param event The event to add
     * @returns The added event
     */
    addEvent(event: Event): Event;
    /**
     * Gets all the content from events in the session.
     *
     * @returns The content from events in the session
     */
    getContents(): Content[];
    /**
     * Gets the state value for the given key.
     *
     * @param key The state key
     * @param defaultValue The default value to return if the key is not found
     * @returns The state value or the default value if not found
     */
    getStateValue(key: string, defaultValue?: unknown): unknown;
    /**
     * Sets the state value for the given key.
     *
     * @param key The state key
     * @param value The state value
     */
    setStateValue(key: string, value: unknown): void;
    /**
     * Deletes the state value for the given key.
     *
     * @param key The state key
     * @returns True if the key was found and deleted, false otherwise
     */
    deleteStateValue(key: string): boolean;
    /**
     * Checks if the state has a value for the given key.
     *
     * @param key The state key
     * @returns True if the key exists in the state, false otherwise
     */
    hasStateValue(key: string): boolean;
    /**
     * Updates the session state with the given values.
     *
     * @param values The values to update the state with
     */
    updateState(values: Record<string, unknown>): void;
    /**
     * Gets the session as a JSON object.
     *
     * @returns The session as a JSON object
     */
    toJSON(): Record<string, unknown>;
    /**
     * Creates a session from a JSON object.
     *
     * @param json The JSON object
     * @returns A new session instance
     */
    static fromJSON(json: Record<string, unknown>): Session;
}