build: compile smoke tests

build/azure-pipelines/darwin/product-build-darwin.yml

@@ -196,6 +196,12 @@ steps:
     timeoutInMinutes: 5
     condition: and(succeeded(), eq(variables['VSCODE_ARCH'], 'x64'), eq(variables['VSCODE_STEP_ON_IT'], 'false'))
 
+  - script: |
+      set -e
+      yarn --cwd test/smoke compile
+    displayName: Compile smoke tests
+    condition: and(succeeded(), eq(variables['CacheRestored'], 'true'), eq(variables['VSCODE_ARCH'], 'x64'), eq(variables['VSCODE_STEP_ON_IT'], 'false'))
+
   - script: |
       set -e
       APP_ROOT=$(agent.builddirectory)/VSCode-darwin-$(VSCODE_ARCH)