code: function FeedJett (options) {
    if (!(this instanceof FeedJett)) {
      return new FeedJett(options);
    }
  
    TransformStream.call(this);
    this._readableState.objectMode = true;
    this._readableState.highWaterMark = 16; // max. # of output nodes buffered
  
    this.init();
    this.parseOptions(options);
  
    sax.MAX_BUFFER_LENGTH = this.options.MAX_BUFFER_LENGTH;
    this.stream = sax.createStream(this.options.strict, {lowercase: true, xmlns: true });
    this.stream.on('processinginstruction', this.onProcessingInstruction.bind(this));
    this.stream.on('attribute', this.onAttribute.bind(this));
    this.stream.on('opentag', this.onOpenTag.bind(this));
    this.stream.on('closetag',this.onCloseTag.bind(this));
    this.stream.on('text', this.onText.bind(this));
    this.stream.on('cdata', this.onText.bind(this));
    this.stream.on('end', this.onEnd.bind(this));
    this.stream.on('error', this.onSaxError.bind(this));
  }
docs: FeedJett constructor. Most apps will only use one instance.
  
  Exposes a duplex (transform) stream to parse a feed.