import { OAuth2Session, OAuth2State, PKCEChallenge } from './types';
export declare const STORAGE_KEYS: {
    readonly SESSION: "strands_account_session";
    readonly PKCE: "strands_account_pkce";
    readonly STATE: "strands_account_state";
};
export interface SessionStore {
    load(): OAuth2Session | null;
    save(session: OAuth2Session | null): void;
}
export declare function createLocalStorageSessionStore(): SessionStore;
export declare function createMemorySessionStore(): SessionStore;
export declare function storePKCE(pkce: PKCEChallenge): void;
export declare function consumePKCE(): PKCEChallenge | null;
export declare function storeState(state: OAuth2State): void;
export declare function consumeState(received: string): OAuth2State | null;