inline pre-/postpack with pack in ember package.json

Author: Lms24

packages/ember/package.json

@@ -18,13 +18,11 @@
   },
   "scripts": {
     "build": "ember build --environment=production",
-    "build:npm": "run-s prepack && npm pack && run-s postpack",
+    "build:npm": "ember ts:precompile && npm pack && ember ts:clean",
     "link:yarn": "yarn link",
     "lint": "npm-run-all --aggregate-output --continue-on-error --parallel lint:*",
     "lint:hbs": "ember-template-lint .",
     "lint:js": "eslint . --cache --cache-location '../../eslintcache/'",
-    "prepack": "ember ts:precompile",
-    "postpack": "ember ts:clean",
     "start": "ember serve",
     "test": "ember try:each",
     "test:all": "node ./scripts/run-CI-tests.js"