@wewei/my-second-component/package.json

{
  "name": "@wewei/my-second-component",
  "version": "0.1.0",
  "main": "dist/index.js",
  "module": "dist/index.js",
  "files": [
    "dist"
  ],
  "scripts": {
    "start": "react-scripts start",
    "build-examples": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject",
    "build": "rimraf dist && NODE_ENV=production babel src/lib --out-dir dist --copy-files --ignore __tests__,spec.js,test.js,__snapshots__"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "react": "^16.6.3",
    "react-dom": "^16.6.3",
    "react-scripts": "^2.1.1",
    "rimraf": "^2.6.2"
  }
}