diff --git a/packages/docusaurus-theme-classic/src/index.ts b/packages/docusaurus-theme-classic/src/index.ts
index d005e7e6e7..612a5ebd6f 100644
--- a/packages/docusaurus-theme-classic/src/index.ts
+++ b/packages/docusaurus-theme-classic/src/index.ts
@@ -29,7 +29,9 @@ const ThemeStorageKey = 'theme';
 const noFlashColorMode = ({
   defaultMode,
   respectPrefersColorScheme,
-}: ThemeConfig['colorMode']) => `(function() {
+}: ThemeConfig['colorMode']) =>
+  /* language=js */
+  `(function() {
   var defaultMode = '${defaultMode}';
   var respectPrefersColorScheme = ${respectPrefersColorScheme};
 
@@ -76,6 +78,7 @@ const AnnouncementBarDismissDataAttribute =
 // We always render the announcement bar html on the server, to prevent layout
 // shifts on React hydration. The theme can use CSS + the data attribute to hide
 // the announcement bar asap (before React hydration)
+/* language=js */
 const AnnouncementBarInlineJavaScript = `
 (function() {
   function isDismissed() {
diff --git a/packages/docusaurus/src/client/BaseUrlIssueBanner/index.tsx b/packages/docusaurus/src/client/BaseUrlIssueBanner/index.tsx
index 3b0621cfc0..5edad3f7c1 100644
--- a/packages/docusaurus/src/client/BaseUrlIssueBanner/index.tsx
+++ b/packages/docusaurus/src/client/BaseUrlIssueBanner/index.tsx
@@ -43,6 +43,7 @@ function createInlineHtmlBanner(baseUrl: string) {
 
 // Needs to work for older browsers!
 function createInlineScript(baseUrl: string) {
+  /* language=js */
   return `
 window['${InsertBannerWindowAttribute}'] = true;