diff --git a/.gitignore b/.gitignore
index d4dd1212d..574749722 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,8 @@ src/**/*.js.map
 src/**/*.d.ts
 src/**/*.d.ts.map
 !src/**/*.test.js
+# Allow hand-written .d.ts for JS modules consumed by TypeScript
+!src/resources/extensions/**/*.d.ts
 
 # ── Repowise index (local machine-generated cache) ──
 .repowise/