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Frequently Asked Questions

I'm getting this error: Class constructor Room cannot be invoked without 'new'", what should I do?

Make sure you have es2015 or higher in your tsconfig.json:

    "compilerOptions": {
        // ...
        "target": "es2015",
        // ...
    // ...

How can I sync data of the state only to a specific client?

In the current state of the framework, you can't do that. You'd need to send data manually to each client (through room's send method), and not use the state for the data you'd like to hide from particular players.

  • There's a big discussion about this on issue #59
  • Hopefully this will be improved when the new serialization gets stable, and integrated with the framework.

How would I broadcast data from one client to others?

You usually don't do that. By using an authoritative game server, the clients generally send actions to the server, and the server mutates the state of the game session. After having the mutation, all clients will receive the latest state from the server in the next patch interval.

Does Colyseus help me with client-prediction?

Colyseus does not provide any client-prediction solution out of the box. Games such as and do not use any form of client-prediction. lerping user coordinates usually gives reasonable results.