[WIP] Remove Eff in favor of Effect

[gabejohnson]

In furtherance of #93 I've swapped out Eff for Effect. Once this PR is merge (in the not too distant future 🙏) work can being on breaking the non-DOM related web APIs out into their own packages.

Everything builds, but there's a transitive dependency on Aff via https://github.com/bodil/purescript-test-unit.

Until Aff (and then Test.Unit) is updated to use Effect or a test library not reliant on Aff replaces it, a merge is not possible.

[garyb]

Since we're talking about related things on Slack just now, I remembered there's a breaking change I wanted to make here - eventListener should return in Effect, since it breaks referential transparency also.

[garyb]

Thanks for your work on this, I'll merge where it's at now, break out anything that isn't strictly dom-ish, and then make the 0.12 branch from what's left 👍

[gabejohnson]

I can still work on breaking things out if you'd like. I'm already working on purescript-web/purescript-web-storage#1 and purescript-web/purescript-web-socket#1

[garyb]

Ah, I've been doing those too 😄... I'm trying to work out a good way of breaking things up, so have been doing a lot of stuff locally. One thing that's happened so far is I've extracted specifically the DOM part of the the spec out as its own thing (purescript-web-dom) so we don't just end up having these packages pull in almost everything anyway.

I thing -web-dom has enough stuff in it for the other libraries too all work from, as it has important types like Node, Event, and EventTarget, so I think the HTML part of the spec will not be necessary as a requirement for this other stuff... will see how it goes anyway. I'm intending on having this somewhat usable today.

[gabejohnson]

Sounds good! I'll halt on my PRs 😄

I'm trying to work out a good way of breaking things up

I'm putting together a straw man categorization of Web APIs. The idea is to have a plan for breaking things up now and extending with additional APIs later. I'll open an issue in this repo once it's ready.