message: dont allow usage of npm
diff: "lint": "yarn lint:scripts",
  "lint:scripts": "eslint \"packages/*/src/**/*.js\" \"packages/*/src/**/*.jsx\" \"packages/*/__tests__/**/*.js\" \"packages/*/__mocks__/**/*.js\" \"packages/*/src/**/*.ts\" \"packages/*/__tests__/**/*.ts\" --ignore-pattern=\"node_modules\"",
  "typecheck": "tsc --noEmit",
  - "watch": "lerna run --no-bail --parallel watch"
  + "watch": "lerna run --no-bail --parallel watch",
  + "preinstall": "node ./scripts/check-yarn.js"
  },
  "jest": {
  "testURL": "http://localhost/index.html",
  