diff --git a/.changeset/sharp-onions-search.md b/.changeset/sharp-onions-search.md
new file mode 100644
index 00000000000..a6d290af399
--- /dev/null
+++ b/.changeset/sharp-onions-search.md
@@ -0,0 +1,5 @@
+---
+"@astrojs/starlight": patch
+---
+
+Updates file tree icon mapping to correctly map `.cjs` and `.mjs` extensions in several contexts