message: browser: Rollup build:watch script
diff: },
  "scripts": {
  "build": "rollup --config",
  + "build:watch": "rollup --config --watch",
  "clean": "rimraf dist coverage .rpt2_cache build",
  "lint": "run-s lint:prettier lint:tslint",
  "lint:prettier": "prettier-check '{src,test}/**/*.ts'",
  