code: function Prefixer() {
        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
  
        _classCallCheck(this, Prefixer);
  
        var defaultUserAgent = typeof navigator !== 'undefined' ? navigator.userAgent : undefined;
  
        this._userAgent = options.userAgent || defaultUserAgent;
        this._keepUnprefixed = options.keepUnprefixed || false;
  
        if (this._userAgent) {
          this._browserInfo = (0, _getBrowserInformation2.default)(this._userAgent);
        }
  
        // Checks if the userAgent was resolved correctly
        if (this._browserInfo && this._browserInfo.cssPrefix) {
          this.prefixedKeyframes = (0, _getPrefixedKeyframes2.default)(this._browserInfo.browserName, this._browserInfo.browserVersion, this._browserInfo.cssPrefix);
        } else {
          this._useFallback = true;
          return false;
        }
  
        var prefixData = this._browserInfo.browserName && prefixMap[this._browserInfo.browserName];
        if (prefixData) {
          this._requiresPrefix = {};
  
          for (var property in prefixData) {
            if (prefixData[property] >= this._browserInfo.browserVersion) {
              this._requiresPrefix[property] = true;
            }
          }
  
          this._hasPropsRequiringPrefix = Object.keys(this._requiresPrefix).length > 0;
        } else {
          this._useFallback = true;
        }
  
        this._metaData = {
          browserVersion: this._browserInfo.browserVersion,
          browserName: this._browserInfo.browserName,
          cssPrefix: this._browserInfo.cssPrefix,
          jsPrefix: this._browserInfo.jsPrefix,
          keepUnprefixed: this._keepUnprefixed,
          requiresPrefix: this._requiresPrefix
        };
      }
docs: Instantiante a new prefixer
  @param {string} userAgent - userAgent to gather prefix information according to caniuse.com
  @param {string} keepUnprefixed - keeps unprefixed properties and values