diff --git a/packages/esm-shim/test/types.ts b/packages/esm-shim/test/types.ts
index fc244a850..43e3a54cc 100644
--- a/packages/esm-shim/test/types.ts
+++ b/packages/esm-shim/test/types.ts
@@ -1,6 +1,6 @@
 import type { RollupOptions } from 'rollup';
 
-import commonjsShim from '../types/index';
+import esmShimDefault, { esmShim } from '../types/index';
 
 const config: RollupOptions = {
   input: 'main.js',
@@ -8,7 +8,7 @@ const config: RollupOptions = {
     file: 'bundle.js',
     format: 'iife'
   },
-  plugins: [commonjsShim()]
+  plugins: [esmShimDefault(), esmShim()]
 };
 
 export default config;
diff --git a/packages/esm-shim/types/index.d.ts b/packages/esm-shim/types/index.d.ts
index e7a2df455..6f279ece7 100644
--- a/packages/esm-shim/types/index.d.ts
+++ b/packages/esm-shim/types/index.d.ts
@@ -1,6 +1,6 @@
 import type { Plugin, SourceMapInput } from 'rollup';
 
-interface Output {
+export interface Output {
   code: string;
   map?: SourceMapInput;
 }
@@ -10,5 +10,6 @@ interface Output {
  *
  * @returns Plugin instance.
  */
-export default function commonjsShim(): Plugin;
+export function esmShim(): Plugin;
+export default esmShim;
 export function provideCJSSyntax(code: string): Output | null;