export type AuthDetails = {
    type: 'none';
} | {
    type: 'api-key';
    apiKey: string;
} | {
    type: 'oauth';
    accessToken: string;
    refreshToken: string;
    expiresAt: number;
    email?: string;
};
export declare function loadAuth(): Promise<AuthDetails>;
export declare function saveApiKeyAuth(apiKey: string): Promise<void>;
export declare function saveOAuthAuth(accessToken: string, refreshToken: string, expiresIn: number, email?: string): Promise<void>;
export declare function updateOAuthTokens(accessToken: string, expiresIn: number): Promise<void>;
export declare function clearAuth(): Promise<void>;
export declare function isAuthenticated(): Promise<boolean>;
export declare function isTokenExpired(expiresAt: number, bufferSeconds?: number): boolean;