code: function wrap(trunk, injector) {
  
    let res = trunk.toString('utf8').replace(/\<body[\s\S]*?\>/, function (all) {
      return all + (Array.isArray(injector) ? injector.join("") : injector || '');
    })
    return res;
  }
docs: wrap
  @param  {[type]} trunk [description]
  @return {[type]}       [description]