Add firestore reducer for typescript

[bawahakim]

Description

I couldn't properly get firestore to work with Typescript, so I went ahead and tried implementing it.

Check List

If not relevant to pull request, check off as complete

• All tests passing
• Docs updated with any changes or examples if applicable
• Added tests to ensure new feature(s) work properly

Relevant Issues

[codecov]

Codecov Report

Merging #296 into master will not change coverage.
The diff coverage is n/a.

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  Lines         626      626           
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  Hits          564      564           
  Misses         62       62           

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[msutkowski]

@feelthepain444 You might want to check this out this PR I closed: prescottprue/react-redux-firebase#964. I'd be happy to collaborate with you on this - I meant to open this against the typescript branch here, but I have no clue as to what's going on with this repo so I've just been keeping my types locally.

Regardless, you'd want to return a Reducer type from redux on firestoreReducer, otherwise you'd still have to cast in combineReducers. And FirestoreReducer.Reducer should probably be more like FirestoreReducer.State.

[alexandermckay]

@msutkowski

@bawahakim is no longer using redux-firestore or react-redux-firestore link.

I am guessing here but I assume he understandably won't want to spend anymore time on this. I will fork his repo over the weekend and add the changes you've suggested.

[devth]

Did anything ever progress with this?

[prescottprue]

v0.15.0 release has the functionality based on code here and @msutkowski mentioned PR - because of that both of you were listed as co-authors of the commit while I was manually combining it

This is a first swing at the types, but it seemed to be working in a simple example. Please reach out if things aren't working as expected!