What are mandatory event callbacks?

[sunkibaek]

So far I know my app will crash if I don't have a callback for error event. What else event must have its callback to prevent errors?

[jondubois]

@sunkibaek There are no mandatory error events but if you're running the client inside Node.js then you should handle it, otherwise the process will crash because Node.js crashes when there are uncaught errors. That said it's highly recommended that you always handle it (including on the front end).

When emitting events on a socket, the handler is 100% optional.