Unsubscribe to all the listener

[chenxeed]

Hello,

should there be a method to remove all listeners of the emitter, to save performance?

I have an example case when we initialize a component, and the component needs to use the event emitter, and pass it to other function to listen to the component event:

// component.js
componentInit() {
  method.init(emitter);
}

// method.js
init (emitter) {
  emitter.on('something', doSomething);
}

Then, when the component is about to be destroyed, should the emitter be "cleaned up" so the method won't have to preserve the event listener anymore? For ex:

// component.js
componentDestroy() {
  emitter.off('*');
}

[chenxeed]

Perhaps this PR is what we need for this issue <3

#72

[papertokyo]

I'm implementing mitt to replace a Vue event bus right now, and this is the only missing piece of functionality.

I like emitter.off('*') because it's fairly obvious, but emitter.clear() is also fine if there's issues with that.

[developit]

I'm just comparing the two options before I merge. I will probably go with .clear() .all.

[developit]

.all shipped in 2.1.0 which is now out of preview:

const events = mitt();
events.on('foo', () => alert(1));
events.on('bar', () => alert(2));

// remove all event handlers:
events.all.clear();