diff --git a/tree-view-sample/vscode.proposed.d.ts b/tree-view-sample/vscode.proposed.d.ts
index 0086481a..b6f93ca0 100644
--- a/tree-view-sample/vscode.proposed.d.ts
+++ b/tree-view-sample/vscode.proposed.d.ts
@@ -639,3 +639,4 @@ declare module 'vscode' {
 		getParent?(element: T): ProviderResult<T>;
 
 	}
+}
\ No newline at end of file