import { StateStore, StoreMeta, VerifyResult } from './StateStore';
import { Context } from 'koa';
/**
 * Creates an instance of `SessionStore`.
 *
 * This is the state store implementation for the OAuth2Strategy used when
 * the `state` option is enabled.  It generates a random state and stores it in
 * `req.session` and verifies it when the service provider redirects the user
 * back to the application.
 *
 * This state store requires session support.  If no session exists, an error
 * will be thrown.
 *
 */
export declare class SessionStore extends StateStore {
    private key;
    constructor(key: string);
    /**
     * Store request state.
     *
     * This implementation simply generates a random string and stores the value in
     * the session, where it will be used for verification when the user is
     * redirected back to the application.
     *
     */
    store(ctx: Context, meta?: StoreMeta): Promise<string>;
    /**
     * Verify request state.
     *
     * This implementation simply compares the state parameter in the request to the
     * value generated earlier and stored in the session.
     *
     */
    verify(ctx: Context, providedState: string): Promise<VerifyResult>;
    static ρAnn(): any;
}