add a flag to package gen typecheck script (#1154)

Author: ahkhanjani

turbo/generators/templates/package.json.hbs

@@ -13,7 +13,7 @@
     "dev": "tsc",
     "format": "prettier --check . --ignore-path ../../.gitignore",
     "lint": "eslint",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit --emitDeclarationOnly false"
   },
   "devDependencies": {
     "@acme/eslint-config": "workspace:*",