/**
 * The code was extracted from:
 * https://github.com/davidchambers/Base64.js
 */
export declare class InvalidCharacterError extends Error {
    constructor(message: string);
}
export declare class InvalidTokenError extends Error {
    constructor(message: string);
}
export declare const jwtDecode: (token: string, options?: {
    header?: boolean;
}) => any;