diff --git a/package.json b/package.json
index becf6a8..31c8e45 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "module": "dist/vue-class-component.esm.js",
   "unpkg": "dist/vue-class-component.js",
   "typings": "lib/index.d.ts",
+  "sideEffects": false,
   "files": [
     "dist",
     "lib",