message: Fix build command of core/clients to show build errors
diff: "node": ">=8.9.0 <9.0"
  },
  "scripts": {
  - "build": "npm run copy:assets && tsc",
  + "build": "npm run copy:assets && tsc 1>&2",
  "clean": "rimraf ./lib",
  "copy:assets": "cpx ./src/assets/**/* ./lib/assets",
  "copy:test-assets": "cpx ./src/test/assets/**/* ./lib/test/assets",
  