app.json

{
  "name": "SPA with Heroku",
  "description": "A reference app for how to build and deploy a frontend alongside a backend app in Heroku",
  "keywords": ["deployment", "frontend", "backend", "spa"],
  "website": "https://www.karlsutt.com/articles/how-to-build-and-serve-spa-with-heroku-app/",
  "repository": "https://github.com/karls/spa-with-heroku",
  "env": {
    "NODE_ENV": {
      "description": "Node.js environment",
      "value": "production"
    },
    "YARN_PRODUCTION": {
      "description": "Should Yarn prune devDependencies?",
      "value": "false"
    },
    "FLASK_ENV": {
      "description": "Flask environment",
      "value": "production"
    }
  },
  "formation": {
    "web": {
      "size": "Eco",
      "quantity": 1
    }
  },
  "buildpacks": [
    {
      "url": "heroku/nodejs"
    },
    {
      "url": "heroku/python"
    }
  ]
}