What "identifier" should I pick?

[carcinocron]

Are there namespace rules for this kind of thing? Best practices?

[FabianLars]

In general it follows the reverse domain name notation. We don't recommend it, but it should be possible to use other formats (or just the app name) in case you don't care about app store support (they generally require this format iirc), but it's not officially supported by us...
The most important thing is that it must be unique for each app.

[JonasKruckenberg]

This would be great to add to the docs FAQ as-is. How do i bookmark something 😂

[FabianLars]

I always leave the tab open in a separate window and then close that after a month of ignoring it. 10/10 would recommend.

[valentimarco]

In tauri 2.8.2 under linux, if you pick a identifier different from the reverse domain you get this error:

(nuxt-beats:57669): Gtk-CRITICAL **: 16:05:35.464: gtk_application_new: assertion 'application_id == NULL || g_application_id_is_valid (application_id)' failed

thread 'main' panicked at /home/marco/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/gtk-0.18.2/src/auto/application.rs:13:1:
assertion failed: !ptr.is_null()
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Here the conf used:

{
  "$schema": "https://schema.tauri.app/config/2.0.0",
  "productName": "NuxtBeats",
  "identifier": "nuxtbeaters",
  "app": {
    "enableGTKAppId": true,
    "windows": [
      {
        "title": "NuxtBeats",
        "width": 1366,
        "height": 768,
        "minWidth": 375,
        "minHeight": 667,
        "resizable": true,
        "decorations": false,
        "fullscreen": false
      }
    ]
  },
  "bundle": {
    "resources": []
  },
  "plugins": {}
}

UPDATE: Set enableGTKAppId to false or not even declare it (by default is false) and the window class is set as the indentifier, use xprop or wlprop to double check it