diff --git a/index.js b/index.js
index 99b3ba1..ab5fdb3 100644
--- a/index.js
+++ b/index.js
@@ -1,16 +1,3 @@
-var __defProp = Object.defineProperty;
-var __markAsModule = (target) => __defProp(target, "__esModule", {value: true});
-var __export = (target, all) => {
-  for (var name in all)
-    __defProp(target, name, {get: all[name], enumerable: true});
-};
-
-// src/wc-markdown.js
-__markAsModule(exports);
-__export(exports, {
-  WCMarkdown: () => WCMarkdown
-});
-
 // node_modules/prism-es6/prism.js
 var _self = {};
 var Prism = function() {
@@ -2535,3 +2522,6 @@ var WCMarkdown = class extends HTMLElement {
   }
 };
 customElements.define("wc-markdown", WCMarkdown);
+export {
+  WCMarkdown
+};
diff --git a/package.json b/package.json
index a498812..5afe120 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "start": "npx live-server --no-browser --port=5500 --open=dev",
     "lint": "esmtk lint",
     "build": "npm run build:esm && npm run build:min",
-    "build:esm": "esmtk commonjs src/wc-markdown.js index.js",
+    "build:esm": "esmtk bundle src/wc-markdown.js index.js",
     "build:min": "esmtk minify src/wc-markdown.js index.min.js",
     "copy": "npm run copy:themes && npm run copy:components",
     "copy:themes": "cp -r node_modules/prism-es6/themes themes",