Dev & Prod setup for CRA package.json

package.json

{
  "name": "DemoApp",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
  },
  "devDependencies": {
  },
  "scripts": {
    "start": "REACT_APP_STAGE=staging react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "predeploy": "REACT_APP_STAGE=staging npm run build",
    "deploy": "aws s3 sync build/ s3://S3_DEV_BUCKET",
    "postdeploy": "aws cloudfront create-invalidation --distribution-id CF_DEV_DISTRIBUTION --paths '/*'",
    "predeploy-prod": "REACT_APP_STAGE=production npm run build",
    "deploy-prod": "aws s3 sync build/ s3://S3_PROD_BUCKET",
    "postdeploy-prod": "aws cloudfront create-invalidation --distribution-id CF_PROD_DISTRIBUTION --paths '/*'",
    "eject": "react-scripts eject"
   }
}