So, the game it's firebase synced? js support is needed? I've used firebase realtime database in games but not for real time, just to save things or syncing initial gamestate with a clunky active polling.
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I mean, technically JS is used for the fetch API but Godot handles all that. This is written entirely in GDScript utilizing my plugin. If you're curious to see it, check it out at: https://github.com/GodotNuts/GodotFirebase. No active polling - we handle streaming through a custom HTTPClient that I also implemented.