Use .mjs extension for ESM module

* Update package.json according to #204

package.json

@@ -11,19 +11,19 @@
     "toast",
     "snackbar"
   ],
-  "main": "dist/index.esm.js",
-  "typings": "dist/index.d.ts",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
   "exports": {
     "./package.json": "./package.json",
     ".": {
-      "import": "./dist/index.esm.js",
-      "require": "./dist/index.js",
-      "types": "./dist/index.d.ts"
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.js"
     },
     "./headless": {
-      "import": "./headless/index.esm.js",
-      "require": "./headless/index.js",
-      "types": "./headless/index.d.ts"
+      "types": "./headless/index.d.ts",
+      "import": "./headless/index.mjs",
+      "require": "./headless/index.js"
     }
   },
   "files": [
@@ -41,8 +41,7 @@
     "test": "echo \"No test specified\"",
     "setup": "pnpm i && cd site && pnpm i && cd .. && pnpm run link",
     "link": "pnpm link ./site/node_modules/react && pnpm link ./site/node_modules/react-dom",
-    "size": "size-limit",
-    "analyze": "size-limit --why"
+    "size": "size-limit"
   },
   "husky": {
     "hooks": {
@@ -62,15 +61,15 @@
       "limit": "5 KB"
     },
     {
-      "path": "dist/index.esm.js",
+      "path": "dist/index.mjs",
       "limit": "5 KB"
     },
     {
       "path": "headless/index.js",
       "limit": "2 KB"
     },
     {
-      "path": "headless/index.esm.js",
+      "path": "headless/index.mjs",
       "limit": "2 KB"
     }
   ],

tsup.config.ts

@@ -6,11 +6,6 @@ const commonConfig: Options = {
   format: ['esm', 'cjs'],
   sourcemap: true,
   clean: true,
-  outExtension({ format }) {
-    return {
-      js: format === 'cjs' ? '.js' : `.${format}.js`,
-    };
-  },
 };
 export default defineConfig([
   {