diff --git a/src/dummy.mjs b/src/dummy.mjs
index a7764dc..86fdc82 100644
--- a/src/dummy.mjs
+++ b/src/dummy.mjs
@@ -1 +1,2 @@
 // This is a dummy module for vite/rollup to resolve.
+Object.defineProperty(Object.create(null), { sideEffects: true });