import { BotState } from './botState';
import { Storage } from './storage';
import { TurnContext } from './turnContext';
/**
 * Reads and writes user state for your bot to storage.
 *
 * @remarks
 * Each user your bot communicates with will have its own isolated storage object that can be used
 * to persist information about the user across all of the conversation you have with that user.
 *
 * ```JavaScript
 * const { UserState, MemoryStorage } = require('botbuilder');
 *
 * const userState = new UserState(new MemoryStorage());
 * ```
 */
export declare class UserState extends BotState {
    private namespace;
    /**
     * Creates a new UserState instance.
     *
     * @param storage Storage provider to persist user state to.
     * @param namespace (Optional) namespace to append to storage keys. Defaults to an empty string.
     */
    constructor(storage: Storage, namespace?: string);
    /**
     * Returns the storage key for the current user state.
     *
     * @param context Context for current turn of conversation with the user.
     * @returns The storage key for the current user state.
     */
    getStorageKey(context: TurnContext): string | undefined;
}
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