Base64: {
    atob: ((asc: string) => string);
    atobPolyfill: ((asc: string) => string);
    btoa: ((bin: string) => string);
    btoaPolyfill: ((bin: string) => string);
    btou: ((b: string) => string);
    decode: ((src: string) => string);
    encode: ((src: string, urlsafe?: boolean) => string);
    encodeURI: ((src: string) => string);
    encodeURL: ((src: string) => string);
    extendBuiltins: (() => void);
    extendString: (() => void);
    extendUint8Array: (() => void);
    fromBase64: ((src: string) => string);
    fromUint8Array: ((u8a: Uint8Array, urlsafe?: boolean) => string);
    isValid: ((src: any) => boolean);
    toBase64: ((src: string, urlsafe?: boolean) => string);
    toUint8Array: ((a: string) => Uint8Array);
    utob: ((u: string) => string);
    version: string;
    VERSION: string;
}