ERROR: Cocos Creator 3.8.2 and colyseus.js 0.15

[human211]

when I launch it in the browser everything is ok. but if I run it in the simulator, it’s an error. Therefore, the connection to the server is not created and the game does not start.

import { _decorator, Component, Node } from 'cc';
const { ccclass, property } = _decorator;
import Colyseus from 'db://colyseus-sdk/colyseus.js';

ccclass('test')
export class test extends Component {
    start () {
        this.client = new Colyseus.Client('ws://localhost:2567');
    }
}

LOG:

10:44:49 [ERROR]: JS: TypeError: Cannot read properties of undefined (reading 'toLowerCase')
TypeError: Cannot read properties of undefined (reading 'toLowerCase')
    at new <anonymous> (jsb-adapter/web-adapter.js:350:35)
    at new Client (http://192.168.1.100:7456/scripting/x/chunks/06/06cb93b53c4faf511f8419cd7b43f5ca107a4e76.js:6151:27)
    at test.start (http://192.168.1.100:7456/scripting/x/chunks/3f/3fed73c55abf94efb7af37eb78a375e40c473aca.js:63:25)
    at eval (eval at createInvokeImplJit (src/cocos-js/builtin-res-mgr.jsb-782de3de.js:8047:69), <anonymous>:3:65)
    at OneOffInvoker._invoke (src/cocos-js/builtin-res-mgr.jsb-782de3de.js:8054:19)
    at OneOffInvoker.invoke (src/cocos-js/builtin-res-mgr.jsb-782de3de.js:7998:22)
    at ComponentScheduler.startPhase (src/cocos-js/builtin-res-mgr.jsb-782de3de.js:8161:35)
    at Director.tick (src/cocos-js/director-cf2afd11.js:1477:41)
    at Game._updateCallback (src/cocos-js/deprecated-88c49970.js:1080:28)
    at src/cocos-js/deprecated-88c49970.js:140:26

[endel]

I consider this to be a bug on Cocos Creator: cocos/cocos-engine#13546 (comment).
If URL is available in a native environment, it should implement its basic functionality.

As a workaround, you can provide the endpoint as an object for Colyseus.Client:

const client = new Colyseus.Client({ hostname: "localhost", port: 2567, secure: false  });