Update tsup.config.ts

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: taj54

tsup.config.ts

@@ -1,12 +1,18 @@
 import { defineConfig } from 'tsup';
 import pkg from './package.json';
 
+export default defineConfig((options) => ({
 export default defineConfig((options) => ({
     entry: ['src/index.tsx'],
     format: ['esm', 'cjs'],
+    outExtension: ext => ({
+        esm: '.mjs',
+        cjs: '.cjs',
+    }),
     dts: true,
     watch: options.watch,
     clean: true,
+}));
     banner: {
         js: `/**
  * ${pkg.name} v${pkg.version}