Update inspector plugin commands.

src/inspector/index.ts

@@ -6,9 +6,10 @@ export * from './inspector';
 
 
 /**
- * The map of command ids used by the inspector plugin.
+ * The command IDs used by the inspector plugin.
  */
 export
-const cmdIds = {
-  open: 'inspector:open'
+namespace CommandIDs {
+  export
+  const open = 'inspector:open';
 };

src/inspector/plugin.ts

@@ -19,7 +19,7 @@ import {
 } from '../instancerestorer';
 
 import {
-  IInspector, Inspector, cmdIds
+  CommandIDs, IInspector, Inspector
 } from './';
 
 
@@ -98,7 +98,7 @@ class InspectorManager implements IInspector {
  */
 function activate(app: JupyterLab, palette: ICommandPalette, restorer: IInstanceRestorer): IInspector {
   const category = 'Inspector';
-  const command = cmdIds.open;
+  const command = CommandIDs.open;
   const label = 'Open Inspector';
   const manager = new InspectorManager();
   const tracker = new InstanceTracker<Inspector>({ namespace: 'inspector' });