Investigate replacing lib/EventEmitter.js with mitt

[timneutkens]

https://github.com/developit/mitt

Mitt is 277 Bytes

EventEmitter.js is around 1.07KB

They have the same functionality from what I've seen.

[timneutkens]

@DullReferenceException could you check this out maybe?

[HaNdTriX]

Mitt is awesome but in my opinion "not very node like".

Feature	node	mitt
chaining (register func return self)	yes	no
supports class inheritance	yes	yes
wildcards	no	yes
emit returns boolean	yes	no
on/off	(after node version 10)	yes
addEventListener/removeEventListener	yes	no

[timneutkens]

@HaNdTriX it doesn't really matter when all we do is provide the .on / .off externally through router.events.

[HaNdTriX]

No not at all. I am actually fine with using mitt. I just wanted to point out the differences.

The issue that was fixed by @DullReferenceException here b492e67 will be reintroduced though. (chaining & emit returns boolean)

[DullReferenceException]

Probably an ok compromise. If the EventEmitter changes don't make it out of canary, nobody will know what they're missing out on. Maybe the mitt maintainers would be ok with some minor contributions (I just really like chaining but acknowledge it's just a convenience).

[lucleray]

With the current version, event-emitter.js is now ~400 bytes gzipped vs mitt is 200 bytes gzipped. Is it still worth it to use mitt ?

[timneutkens]

@lucleray yes it would still be worth replacing it imo.