Add Redux Toolkit

[markerikson]

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Details

This PR demonstrates how to convert the default example project to use Redux Toolkit, per #637 . It is not necessarily meant to be merged as-is, although if you'd like to use it as a starting point, please do so.

Changes

• Added @reduxjs/toolkit as a dependency, and removed the explicit dependencies on redux-thunk and redux-immutable-state-invariant (both of which are used internally by RTK)
• Converted the store setup logic to use RTK's configureStore(). This considerably simplified the store setup logic, removing the need for separate "dev" and "prod" functions.
• Created a sample fuelSavingsSlice.js that is equivalent to the existing sample reducer + actions + constants files, including porting the existing reducer tests to cover the new slice file.
• Renamed rootReducer to createRootReducer for clarity
• Converted the main container component to use the "object shorthand" form of mapDispatch, which is our recommended way to bind action creators.

[coveralls]

Coverage increased (+2.8%) to 94.309% when pulling e103dc2 on markerikson:feature/add-redux-toolkit into 3345563 on coryhouse:master.

[nickytonline]

Thanks for the PR @markerikson!

LGTM, but as mentioned in the issue, I will let @coryhouse and @kwelch give this a look as well.

[kwelch]

First, Hey @markerikson!

I think the changes around mapDispatch, is a great. It was glorious when I found out that was possible.

I think the slice work is great, but it does not appear to be integrated.

I think for the nature of this repo, it should be using one approach consistently. To help promote best practices and simplify the on-boarding experience.

Having both approaches could be confusing to new comers, whom are the target demographic for this repo.

[markerikson]

@kwelch : right, it's not complete. I just wanted to show the basic pattern so that you folks would have that to work from, and you can complete the conversion from there.

[kwelch]

Overall, I really like the approach. Slices look amazing and extremely helpful for sharing which is a major pain point. Also the store configuration is much simpler and cleaner.

[coryhouse]

Hi Mark - Thanks for the PR! I see good stuff in here I like such as the object form of mapDispatchToProps. You said this isn't ready for merge, so I'm unclear: What open issues are there?

[markerikson]

@coryhouse : per the earlier comment, I didn't try to clean up all the other existing logic, and I wasn't sure if there were other aspects of the codebase that might also need to be changed. The PR itself might be okay to merge, but I wanted to be clear that it wasn't a 100% complete conversion in and of itself.