Function btoa

Script/Parser.js:3039–3041

(b)

        return chars.join('');
    };
    var btoa = function (b) {
        return b.replace(/[\s\S]{1,3}/g, cb_encode);
    };
    // var _encode = function(u) {
    //  var isUint8Array = Object.prototype.toString.call(u) === '[object Uint8Array]';
    //  return isUint8Array ? u.toString('base64')