[WIP] Update to Elm 0.18 and Firebase 3

[ThomasWeiser]

PR to track progress. Please use it for discussions and reviews.

Previous discussions in issues Support elm 0.17 and Firebase 3.0

Agenda:

• [x] Adopt new native code conventions
• [x] Comparable types for specifying subscriptions
• [x] Effect manager to handle valueChanged subscriptions
• [ ] Sort out structure of exposed modules
• [ ] Allow for query options
• [ ] Support syncing to a dict (like old ElmFire.Extra)
• [ ] Research design choices for childAdded queries (tricky)
• [ ] Migrate to Firebase 3.x (Google's version)
• [ ] Changed authentication API for Firebase 3
• [x] Use Elm 0.18
• [ ] Testing framework (I have a feeling that we need a new kind of test framework for effect managers.)

And:

• Discuss API with community
• Documentation
• Nice demo app

[atlewee]

Really like what I see happening now. Will the example also be migrated to 0.18? :)

[ThomasWeiser]

@atlewee thanks, missed that one. Example is now updated too.

[txgruppi]

Hi @ThomasWeiser,

I'm really interested in this project and I would like to help you to update it to Elm 0.18 but I'm not that advanced in Elm so if you're willing to somehow guide me I can help you with the code.

To give you an idea of how I'm using Elm you can check the repos below (most recent to older)

• https://github.com/txgruppi/elm-webpack-starter
• https://gitlab.com/txgruppi/bigtalk-frontend
• https://github.com/txgruppi/site-frontend

Kind regards.

[arnauorriols]

FWIW, Firebase 4.x is out already (see release notes). Just saying in case you think it makes sense to sync directly to it.