Request for articles/epics.md

[westandy-dcp]

This is a...

• feature request

I would like the Epics.md updated to reflect some modern approaches to the login epic. The following example is how we implemented an epic. The main part that bothered me with your current example is the embedded http.post(...).pipe(...) because it reminds me too much of the old callback hell.

For what it is worth, I hope this helps some folks develop cleaner code.

  login = (action$: ActionsObservable) =>
     action$.pipe(
       ofType(SessionActions.LOGIN_USER),
       map(() => getSomePayload()),
       map((payload: SomeStruct) => formatPayload(payload)),
       mergeMap((payload: SomeOtherStruct) => this.http.post(...)),
       map(response:any) => Actions.createAnAction(response)),
       catchError(this.handleError)
    )

[takahser]

Also, there seems to be a problem with the current version of ActionsObservable. I keep getting this error:

Generic type 'ActionsObservable<T>' requires 1 type argument(s).ts(2314)

I'm using "redux-observable": "^1.1.0"

[takahser]

I was able to resolve this issue by replacing the redux-observable dependency with

"redux-observable-es6-compat": "^1.2.1",

related: https://github.com/redux-observable/redux-observable/issues/644