Firebase Dynamic Links subdomain config

Question

Let's say I have a domain example.com. And I created a second website through hosting and cli as sub.example.com.

{
  "hosting": [
    {
      "target": "app",
      "public": "public",
      "rewrites": [
        {
          "source": "**",
          "destination": "/index.html"
        }
      ]
    },
    {
      "target": "promos",
      "public": "public",
      "appAssociation": "AUTO",
      "rewrites": [
        {
          "source": "**",
          "dynamicLinks": true
        }
      ]
    }
  ]
}

Now when I go to create Dynamic Link for sub.example.com without any path prefix, it gives me a red flag saying:

It looks like you already have content served on this path. Specify a different path prefix to avoid conflicts with existing content.

1. What am I doing wrong?
2. Also, if this subdomain is only for links, I still have to put public field? I don't want to show anything on it, just links...

Answer 1

I fixed it by adding (or rather ignoring) the public folder for the dynamic links subdomain.

"ignore": [
    "*"
  ],

I saw this post: https://github.com/firebase/firebase-tools/issues/566 and someone asked similar question for functions and the answer was to delete dist/index.html. But since my actual site depends on it, I tried just ignoring it and it seems to work.

Answer 2

I fixed the same issue with @cocacrave's answer. Just sharing the full firebase.json file. * There should be a public folder and settings but my public folder is empty.

{
  "hosting": {
    "public": "public",
    "ignore": [
      "*"
    ],
    "appAssociation": "AUTO",
    "rewrites": [
      {
        "source": "/**",
        "dynamicLinks": true
      }
    ]
  }
}