The ws module no longer exposes the standard API for onmessage/onclose events

[ThisIsMissEm]

See: https://github.com/websockets/ws/releases/tag/8.0.0

Previously it used the same API as the client standard, but now it needs you to specifically decode messages:

websocket.on('message', function message(data, isBinary) {
  const message = isBinary ? data : data.toString();
  // Continue as before.
});

[ThisIsMissEm]

Actually, looking closer, it looks like the release notes may have been slightly confusing / misleading: it seems only the events emitted are now non-standard, so on("message", (data, isBinary) => {}), but the onmessage handlers are still standard: https://github.com/websockets/ws/blob/5e4149ec6a82e0367a925881abca5667667030e9/lib/event-target.js#L193-L200

@lpinca could you confirm this API change?

[lpinca]

Correct, and it has always been like this (even before ws@8.0.0). Only listeners added via the EventTarget interface receives "standard" Events.