code: function goBack(goBackValue) {
          if (this.hasBack()) {
            window.parent.postMessage(
              {
                msg: 'luigi.navigation.back',
                goBackContext: goBackValue && JSON.stringify(goBackValue)
              },
              '*'
            );
          }
        }
docs: Discards the active view and navigates back to the last visited view (preserved view), if a preserved view was set before.
  @param {any} goBackValue data that is passed in the `goBackContext` field to the last visited view
  @example
  LuigiClient.linkManager().goBack({ foo: 'bar' });
  LuigiClient.linkManager().goBack(true);