diff --git a/build_npm.ts b/build_npm.ts
index 25414c5..6aef218 100644
--- a/build_npm.ts
+++ b/build_npm.ts
@@ -16,3 +16,4 @@ await build(
 // post build steps
 Deno.copyFileSync("LICENSE", "npm/LICENSE");
 Deno.copyFileSync("README.md", "npm/README.md");
+Deno.writeTextFileSync("npm/script/index.js", "module.exports = promiseObject;", { append: true });
diff --git a/index.ts b/index.ts
index a7ec493..39ddfa0 100644
--- a/index.ts
+++ b/index.ts
@@ -42,3 +42,5 @@ export async function promiseObject<T>(obj: T): Promise<ResolveObject<T>> {
 
 	return resolver(obj);
 }
+
+export default promiseObject;