code: function decode(buf, options, cb) {
    function getData(j, width, height) {
      const dest = {
        width: width,
        height: height,
        data: new Uint8Array(width * height * 4)
      };
      j.copyToImageData(dest);
      return dest.data;
    }
  
    try {
      const j = new _jpg.JpegImage();
      j.parse(buf);
  
      const width = options.width || j.width;
      const height = options.height || j.height;
      const data = getData(j, width, height);
  
      const result = {
        width: width,
        height: height,
        data: data
      };
  
      cb(null, result);
    } catch (err) {
      if (typeof err === 'string') {
        // jpg.js throws 'string' values, convert to an Error
        err = new Error(err);
      }
      cb(err);
    }
  }
docs: Decode the JPEG data
  
  @param buf Uint8Array
  @param options Object { width: number, height: number }
  @param cb Callback to invoke on completion
  
  @callback { width: number, height: number, data: Uint8Array }