/**
 *
 *  base64 encode / decode
 *  http://www.webtoolkit.info/
 *
 **/
export declare class Base64 {
    private _keyStr;
    /**
     * public method for encoding
     * @param input
     * @returns string
     */
    encode(input: string): string;
    /**
     * public method for decoding
     * @param input string
     * @returns string
     */
    decode(input: string): string;
    /**
     * private method for UTF-8 encoding
     * @param text string
     * @returns string
     */
    private _utf8_encode;
    /**
     * private method for UTF-8 decoding
     * @param utf8text string
     * @returns string
     */
    private _utf8_decode;
}
declare const base64: Base64;
export default base64;