nuxt + express production config

firebase.json

{
  "functions": {
    "source": "functions",
    "predeploy": [
      "npm --prefix src run lint",
      "npm --prefix src run build",
      "rm -rf functions/src/nuxt",
      "cp -r src/.nuxt/ functions/lib/nuxt/",
      "cp src/nuxt.config.js functions/src",
      "cp src/nuxt.config.js functions/lib",
      "npm --prefix functions run lint",
      "npm --prefix functions run build"
    ]
  },
  "hosting": {
    "predeploy": [
      "rm -rf public/* && mkdir -p public/_nuxt && cp -a src/.nuxt/dist/client/. public/_nuxt && cp -a src/static/. public/ && cp -a public_base/. public/"
    ],
    "public": "public",
    "ignore": [
      "firebase.json",
      "**/.*",
      "src/node_modules/**"
    ],
    "rewrites": [
      {
        "source": "/api/**",
        "function": "apiHttp"
      },
      {
        "source": "**",
        "function": "ssrapp"
      }
    ]
  }
}