docs: function (config, data, callback) {
          callback(null)
          // Set time to wait for callback to finish its work. Then close launcher (Issue Testem: fails to close custom launcher on Linux) https://github.com/testem/testem/issues/915
          setTimeout(function (params) {
            window.callPhantom({
              command: 'exit',
              reason: 'transport close'
            })
          }, 2000)
        }