1 files changed, 2 insertions, 12 deletions
diff --git a/app/assets/javascripts/helpers/startup_css_helper.js b/app/assets/javascripts/helpers/startup_css_helper.js
index 8e25e1421c0..d41a6209898 100644
--- a/app/assets/javascripts/helpers/startup_css_helper.js
+++ b/app/assets/javascripts/helpers/startup_css_helper.js
@@ -20,19 +20,9 @@ const handleStartupEvents = () => {
   }
 };
 
-/* Wait for.... The methods can be used:
-  - with a callback (preferred),
-    waitFor(action)
-
-  - with then (discouraged),
-    await waitFor().then(action);
-
-  - with await,
-    await waitFor;
-    action();
--*/
+/* For `waitForCSSLoaded` methods, see docs.gitlab.com/ee/development/fe_guide/performance.html#important-considerations */
 export const waitForCSSLoaded = (action = () => {}) => {
-  if (!gon.features.startupCss || allLinksLoaded()) {
+  if (!gon?.features?.startupCss || allLinksLoaded()) {
     return new Promise(resolve => {
       action();
       resolve();