Merge pull request #10368 from jtpio/ishell-mode

Remove `mode` from the `JupyterFrontEnd.IShell` interface

packages/application/src/frontend.ts

@@ -17,7 +17,7 @@ import { Token } from '@lumino/coreutils';
 
 import { ISignal, Signal } from '@lumino/signaling';
 
-import { DockPanel, Widget } from '@lumino/widgets';
+import { Widget } from '@lumino/widgets';
 
 /**
  * The type for all JupyterFrontEnd application plugins.
@@ -283,11 +283,6 @@ export namespace JupyterFrontEnd {
      */
     readonly currentWidget: Widget | null;
 
-    /**
-     * The user interface mode.
-     */
-    readonly mode: DockPanel.Mode;
-
     /**
      * Returns an iterator for the widgets inside the application shell.
      *