build: use microbundle

Author: jorisre

package.json

@@ -2,13 +2,14 @@
   "name": "@hookform/error-message",
   "version": "0.0.4",
   "description": "React Hook Form error message component",
+  "source": "src/index.ts",
   "main": "dist/index.js",
   "module": "dist/index.esm.js",
-  "umd:main": "dist/index.umd.production.min.js",
-  "unpkg": "dist/index.umd.production.min.js",
-  "jsdelivr": "dist/index.umd.production.min.js",
+  "esmodule": "dist/index.modern.js",
   "jsnext:main": "dist/index.esm.js",
-  "source": "src/index.ts",
+  "unpkg": "dist/index.umd.js",
+  "umd:main": "dist/index.umd.js",
+  "jsdelivr": "dist/index.umd.js",
   "types": "dist/index.d.ts",
   "sideEffects": false,
   "files": [
@@ -20,7 +21,7 @@
   "scripts": {
     "clean": "rimraf dist",
     "prebuild": "npm run clean",
-    "build": "node rollup/writeCjsEntryFile.js && rollup -c",
+    "build": "microbundle build --jsx React.createElement",
     "lint": "eslint '**/*.{js,ts}'",
     "lint:fix": "npm run lint -- --fix",
     "lint:types": "tsc --noEmit",