/**
 *****************************************
 * 抛出接口
 *****************************************
 */
export declare const base64: {
    atob: typeof atob;
    btoa: typeof btoa;
    encode: typeof encode;
    decode: typeof decode;
};
/**
 *****************************************
 * 将base64解码成utf8字符串
 *****************************************
 */
export declare function atob(str: string): string;
/**
 *****************************************
 * 将utf8字符串编码成base64
 *****************************************
 */
export declare function btoa(str: string): string;
/**
 *****************************************
 * 编码字符
 *****************************************
 */
export declare function encode(str: string): number[];
/**
 *****************************************
 * 解码字符
 *****************************************
 */
export declare function decode(arr: ArrayLike<number>, start?: number, end?: number): string;
//# sourceMappingURL=base64.d.ts.map