feat: add eventEmitter

[perrin4869]

This is motivated by a discussion we had in the dirty-chai repo here.
I used the eventemitter3 module in order to have the same behavior in the browser as in nodejs, but it might not be the optimal choice.
my hope is that this facilitates the upgrade of dirty-chai to support chai 5

[keithamus]

Both Node and the browser has EventTarget & Event built in, so we could use that?

[perrin4869]

that's a good suggestion, went ahead and tried replacing the underlying event emitter with the EventTarget. There's some book keeping necessary in this case, but nothing too bad. What do you think?

[keithamus]

@43081j for a second review.

[keithamus]

LGTM modulo fixing the lint issues.

[perrin4869]

oh I missed those! added the globals package to detect the additional globals here

[keithamus]

Still looks reasonable, but I'd like a second review from @koddsson or @43081j

[43081j]

just for some context, can you give me an example of the usage of this?

the change makes sense but i'd like to see how it'll be used

[keithamus]

@43081j prodatakey/dirty-chai#54 - dirty-chai needs to know which getters get added so it can turn them into methods to offer an alternative syntax.

[43081j]

I understand now 👍

I missed that they're not overriding members but are just adding extra ones

Makes sense

[keithamus]

Still LGTM.

[perrin4869]

could this be published? I would like to go on with a PR to use this feature in dirty-chai