1export declare function base64Encode(str: string): string; 2export declare function base64Decode(str: string): string; 3export declare function base64URLEncode(str: string): string; 4export declare function base64URLDecode(str: string): string; 5export declare function base64URLEscape(str: string): string; 6export declare function base64URLUnescape(str: string): string; 7