dist includes only ESM

Author: gfx

package.json

@@ -4,15 +4,16 @@
   "description": "MessagePack for ECMA-262/JavaScript/TypeScript",
   "author": "The MessagePack community",
   "license": "ISC",
+  "type": "module",
   "main": "./dist/index.js",
-  "module": "./dist.esm/index.mjs",
+  "module": "./dist/index.js",
   "cdn": "./dist.umd/msgpack.min.js",
   "unpkg": "./dist.umd/msgpack.min.js",
   "types": "./dist/index.d.ts",
   "sideEffects": false,
   "scripts": {
     "build": "npm publish --dry-run",
-    "prepare": "npm run clean && webpack --bail && tsc --build tsconfig.dist.json tsconfig.dist.esm.json && ts-node tools/esmify.ts dist.esm/*.js dist.esm/*/*.js",
+    "prepare": "npm run clean && webpack --bail && tsc --build tsconfig.dist.json",
     "prepublishOnly": "npm run test:dist",
     "clean": "rimraf build dist dist.*",
     "test": "mocha 'test/**/*.test.ts'",