now.json

{
  "version": 2,
  "env": {
    "FIREBASE_PROJECT_ID": "@firebase_project_id",
    "FIREBASE_PRIVATE_KEY_ID": "@firebase_private_key_id",
    "FIREBASE_PRIVATE_KEY": "@firebase_private_key",
    "FIREBASE_CLIENT_EMAIL": "@firebase_client_email",
    "FIREBASE_CLIENT_ID": "@firebase_client_id",
    "FIREBASE_CLIENT_X509_CERT_URL": "@firebase_client_x509_cert_url"
  },
  "routes": [
    {
      "src": "^/service-worker.js$",
      "dest": "/_next/static/service-worker.js",
      "headers": {
        "cache-control": "public, max-age=0, immutable",
        "Service-Worker-Allowed": "/"
      }
    },
    {
      "src": "^/build-manifest.json$",
      "dest": "/_next/build-manifest.json",
      "headers": {
        "cache-control": "public, max-age=0, immutable",
        "Service-Worker-Allowed": "/"
      }
    },
    {
      "src": "^/react-loadable-manifest.json$",
      "dest": "/_next/react-loadable-manifest.json",
      "headers": {
        "cache-control": "public, max-age=0, immutable",
        "Service-Worker-Allowed": "/"
      }
    },

    {
      "src": "^/firebase-messaging-sw.js$",
      "dest": "/_next/static/firebase-messaging-sw.js",
      "headers": {
        "cache-control": "public, max-age=0, immutable",
        "Service-Worker-Allowed": "/"
      }
    },
    {
      "src": "^/manifest.json$",
      "dest": "/_next/static/manifest.json",
      "headers": {
        "cache-control": "public, max-age=0, immutable",
        "Service-Worker-Allowed": "/"
      }
    },
    {
      "src": "^/.well-known/assetlinks.json$",
      "dest": "/_next/static/assetlinks.json",
      "headers": {
        "cache-control": "public, max-age=0, immutable",
        "Service-Worker-Allowed": "/"
      }
    }
  ]
}