Allow subscribing to multiple topics at once with same callback

[Arcanorum]

Would be nice to be able to set the same callback for multiple topics at once, for cases where you want the same thing to happen for any of a set of events.

Something like

PubSub.subscribe([EVENT_1, EVENT_2, EVENT_3], (msg, data) => {
    ...
}),

[mroderick]

I don't know if this addresses your issue, but you don't have to use anonymous functions as the receiver of notifications.

function callback(msg, data) {
  // ...
}

PubSub.subscribe(EVENT_1, callback);
PubSub.subscribe(EVENT_2, callback);
PubSub.subscribe(EVENT_3, callback);

Additionally, you can use hierarchical adressing to solve the problem of subscribing to multiple events.

If you really need to have PubSub.subscribe([EVENT_1, EVENT_2, EVENT_3], callback); then I suggest creating a pull request.