Fix examples

jupyterlab · Dec 20, 2019 · a1b113d · a1b113d
1 parent 3565c21
commit a1b113d
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Showing 3 changed files with 11 additions and 9 deletions.
diff --git a/examples/cell/src/index.ts b/examples/cell/src/index.ts
@@ -62,11 +62,13 @@ function main(): void {
 
   // Handle the mimeType for the current kernel.
   session.kernelChanged.connect(() => {
-    void session.kernel.ready.then(() => {
-      const lang = session.kernel.info.language_info;
-      const mimeType = mimeService.getMimeTypeByLanguage(lang);
-      cellWidget.model.mimeType = mimeType;
-    });
+    if (session.kernel) {
+      void session.kernel.ready.then(() => {
+        const lang = session.kernel!.info!.language_info;
+        const mimeType = mimeService.getMimeTypeByLanguage(lang);
+        cellWidget.model.mimeType = mimeType;
+      });
+    }
   });
 
   // Use the default kernel.

diff --git a/examples/filebrowser/src/index.ts b/examples/filebrowser/src/index.ts
@@ -153,7 +153,7 @@ function createApp(manager: ServiceManager.IManager): void {
   commands.addCommand('file-save', {
     execute: () => {
       let context = docManager.contextForWidget(activeWidget);
-      return context.save();
+      return context?.save();
     }
   });
   commands.addCommand('file-cut', {

diff --git a/examples/notebook/src/commands.ts b/examples/notebook/src/commands.ts
@@ -59,15 +59,15 @@ export const SetupCommands = (
   commands.addCommand(cmdIds.invokeNotebook, {
     label: 'Invoke Notebook',
     execute: () => {
-      if (nbWidget.content.activeCell.model.type === 'code') {
+      if (nbWidget.content.activeCell?.model.type === 'code') {
         return commands.execute(cmdIds.invoke);
       }
     }
   });
   commands.addCommand(cmdIds.selectNotebook, {
     label: 'Select Notebook',
     execute: () => {
-      if (nbWidget.content.activeCell.model.type === 'code') {
+      if (nbWidget.content.activeCell?.model.type === 'code') {
         return commands.execute(cmdIds.select);
       }
     }
@@ -77,7 +77,7 @@ export const SetupCommands = (
     execute: () => nbWidget.context.save()
   });
 
-  let searchInstance: SearchInstance;
+  let searchInstance: SearchInstance | undefined;
   commands.addCommand(cmdIds.startSearch, {
     label: 'Find...',
     execute: () => {