message: Make localDisposables a nullable type in extension
diff: @@ -68,7 +68,7 @@ export async function activate(context: vscode.ExtensionContext, packageJSON: an
  const languageMiddlewareFeature = new LanguageMiddlewareFeature();
  languageMiddlewareFeature.register();
  disposables.add(languageMiddlewareFeature);
  - let localDisposables: CompositeDisposable;
  + let localDisposables: CompositeDisposable | undefined;
  const testManager = new TestManager(optionProvider, server, eventStream, languageMiddlewareFeature);
  const completionProvider = new CompletionProvider(server, languageMiddlewareFeature);
  @@ -130,7 +130,7 @@ export async function activate(context: vscode.ExtensionContext, packageJSON: an
  if (localDisposables) {
  localDisposables.dispose();
  }
  - localDisposables = null;
  + localDisposables = undefined;
  }));
  disposables.add(registerCommands(context, server, platformInfo, eventStream, optionProvider, omnisharpMonoResolver, packageJSON, extensionPath));
  