code: function() {
                bundle.browserify.pipeline.get('deps').push(through.obj(function(row, enc, next) {
                  var file = row.expose ? bundle.browserify._expose[row.id] : row.file;
  
                  if (self.cache) {
                    bundle.browserifyOptions.cache[file] = {
                      source: row.source,
                      deps: xtend({}, row.deps)
                    };
                  }
  
                  this.push(row);
                  next();
                }));
              }
docs: Watch dependencies for changes and invalidate the cache when needed