firebase.json

{
  "hosting": {
    "public": "build/web",
    "site": "io-photobooth-dev",
    "cleanUrls": true,
    "trailingSlash": false,
    "ignore": [
      ".firebase",
      "firebase.json",
      "functions/node_modules",
      "functions/src",
      "__/**"
    ],
    "rewrites": [
      { "source": "/share/**",
        "function": "shareImage"
      },
      {
        "source": "**",
        "destination": "/index.html"
      }
    ],
    "headers": [
      { "source": "**/*.@(eot|otf|ttf|ttc|woff|font.css)",
        "headers": [{
          "key": "Access-Control-Allow-Origin",
          "value": "*"
        }]
      },
      { "source": "**/*.@(jpg|jpeg|gif|png)",
        "headers": [{
          "key": "Cache-Control",
          "value": "max-age=3600"
        }]
      },
      {
        "source": "**",
        "headers": [{
          "key": "Cache-Control",
            "value": "no-cache, no-store, must-revalidate"
        }]
      }
    ],
    "predeploy": []
  },
  "functions": {
    "source": "functions",
    "runtime": "nodejs14",
    "predeploy": [
      "npm --prefix ./functions run test",
      "npm --prefix ./functions run build"
    ]
  },
  "storage": {
    "rules": "storage.rules"
  },
  "emulators": {
    "hosting": {
      "name": "app",
      "port": 5000,
      "host": "0.0.0.0"
    },
    "functions": {
      "name": "api",
      "port": 5001,
      "host": "0.0.0.0"
    },
    "ui": {
      "enabled": true,
      "port": 5002,
      "host": "0.0.0.0"
    }
  }
}