code: function (newPaneOptions) {
      var newInstance = newPaneOptions.newInstance
      if (!newInstance) {
        let uri = newPaneOptions.newBase
        if (uri.endsWith('/')) {
          uri = uri.slice(0, -1)
          newPaneOptions.newBase = uri
        }
        newInstance = kb.sym(uri)
        newPaneOptions.newInstance = newInstance
      }
  
      var contentType = mime.lookup(newInstance.uri)
      if (!contentType || !(contentType.startsWith('text') || contentType.includes('xml'))) {
        let msg = 'A new text file has to have an file extension like .txt .ttl etc.'
        alert(msg)
        throw new Error(msg)
      }
  
      return new Promise(function (resolve, reject) {
        kb.fetcher.webOperation('PUT', newInstance.uri, {data: '\n', contentType: contentType})
          .then(function (response) {
            console.log('New text file created: ' + newInstance.uri)
            newPaneOptions.newInstance = newInstance
            resolve(newPaneOptions)
          }, err => {
            alert('Cant make new file: ' + err)
            reject(err)
          })
      })
    }
docs: Create a new text file in a Solid system,