fix exports

rollup.config.js

@@ -0,0 +1,12 @@
+import resolve from '@rollup/plugin-node-resolve'
+import commonjs from '@rollup/plugin-commonjs'
+
+export default {
+    input: 'src/index.js',
+    output: {
+        file: 'dist/index.js',
+        format: 'esm',
+        sourcemap: true,
+    },
+    plugins: [resolve(), commonjs()],
+}