code: function (newPaneOptions) {
      var kb = UI.store
      var newInstance = newPaneOptions.newInstance || kb.sym(newPaneOptions.newBase)
      var u = newInstance.uri
      if (u.endsWith('/')) {
        u = u.slice(0, -1) // chop off trailer
      }// { throw new Error('URI of new folder must end in "/" :' + u) }
      newPaneOptions.newInstance = kb.sym(u + '/')
  
      // @@@@ kludge until we can get the solid-client version working
      // Force the folder by saving a dummy file inside it
      return kb.fetcher.webOperation('PUT', newInstance.uri + '.dummy')
        .then(function () {
          console.log('New folder created: ' + newInstance.uri)
  
          return kb.fetcher.delete(newInstance.uri + '.dummy')
        })
        .then(function () {
          console.log('Dummy file deleted : ' + newInstance.uri + '.dummy')
  /*
          return kb.fetcher.createContainer(parentURI, folderName) // Not BOTH ways
        })
        .then(function () {
  */
          console.log('New container created: ' + newInstance.uri)
          return newPaneOptions
        })
    }
docs: Create a new folder in a Solid system,