code: function addBannerToBundle (chunk, enc, next) {
        if (!bannerAlreadyAdded) {
          bannerAlreadyAdded = true;
          try {
            banner = getBanner(options);
            this.push(new Buffer(banner));
          }
          catch (e) {
            next(e);
          }
        }
        this.push(chunk);
        next();
      }
docs: Injects the banner comment block into the Browserify bundle