diff --git a/modules/utils/getHighlights.js b/modules/utils/getHighlights.js
index 0042860c..bc0414ed 100644
--- a/modules/utils/getHighlights.js
+++ b/modules/utils/getHighlights.js
@@ -14,6 +14,7 @@ function escapeHTML(code) {
 
 // These should probably be added to highlight.js auto-detection.
 const extLanguages = {
+  cjs: 'javascript',
   map: 'json',
   mjs: 'javascript',
   tsbuildinfo: 'json',