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In the following example:
```js
io.use((socket, next) => {
next(new Error('Auth failed'));
});
// client-side
const socket = io('https://url/custom-namespace');
socket.on('error', (err) => {
// ...
});
```
The 'error' event wasn't fired on the custom namespace.
socket.io-client
How to use
A standalone build of socket.io-client is exposed automatically by the
socket.io server as /socket.io/socket.io.js. Alternatively you can
serve the file socket.io.js found in the dist folder.
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io('http://localhost');
socket.on('connect', function(){});
socket.on('event', function(data){});
socket.on('disconnect', function(){});
</script>
// with ES6 import
import io from 'socket.io-client';
const socket = io('http://localhost');
A slim build (without JSON3, a JSON polyfill for IE6/IE7, and debug) is also available: socket.io.slim.js.
Socket.IO is compatible with browserify and webpack (see example there).
Node.JS (server-side usage)
Add socket.io-client to your package.json and then:
var socket = require('socket.io-client')('http://localhost');
socket.on('connect', function(){});
socket.on('event', function(data){});
socket.on('disconnect', function(){});
API
See API