import type { TokenManager, TokenStatus } from './types.js';
/**
 * Null-object TokenManager for testing and fallback.
 * Two factories: createAuthenticated() returns a manager with a fake token,
 * createUnauthenticated() returns one that throws on getAccessToken().
 */
export declare class NullTokenManager implements TokenManager {
    private readonly _authenticated;
    private readonly _token;
    private constructor();
    static createAuthenticated(token?: string): NullTokenManager;
    static createUnauthenticated(): NullTokenManager;
    getAccessToken(): Promise<string>;
    authenticate(): Promise<void>;
    isAuthenticated(): boolean;
    getTokenStatus(): TokenStatus;
    shutdown(): void;
}
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