Use an Immutable store

[okjulian]

It would be great if this library could work with Immutable.js stores, and I think it's a good idea to start talking about it in this issue.

I'm already using this library with an Immutable store and opened PR #54, but it only works with redux-offline v1.

To accept an Immutable store using my approach you only needed to set config.immutable = true. To achieve this, the only thing I needed was to teach redux-offline how to persist and rehydrate Immutable object. Luckily redux-persist-immutable makes this super easy, so I added it as a dependency.

Implementing this was straightforward: The key parts were using a different persistStore and autoRehydrate in index.js, and converting the user's state to javascript in middleware.js so that redux-offline internals can still work with plain JS objects.

Please let me know of better ways to tackle this problem. Supporting Immutable stores would be great!

[Jimmy-CC]

If you only want to use Immutable object in the redux offline, passing transforms to persistOptions is a good enough solution.

But it will be great if we can detect to use Immutable transit by passing options and works with immutable store.

import immutableTransform from 'redux-persist-transform-immutable'
import offlineConfig from 'redux-offline/lib/defaults'

const store = createStore(
  combineReducers(reducers),
  {},
  compose(
    applyMiddleware(middleware),
    offline({
      ...offlineConfig,
      persistOptions: {
        transforms: [immutableTransform()],
      },
    })
  )
)

[fabriziomoscon]

I created a PR #99 for this very same issue

[sorodrigo]

PR is now merged in master