[createReducer()] `Type 'void' is not assignable to type 'T'.ts(2345)` when used with redux-saga createSagaMiddleware()

[rtruong]

What is the current behavior?

When trying to use createReducer() with redux-saga createSagaMiddleware(), we get the following compilation error in TypeScript 3.8.3:

Argument of type 'SagaMiddleware<object>' is not assignable to parameter of type 'Middleware<EmptyAction<"DECREMENT"> | EmptyAction<"INCREMENT"> | EmptyAction<"SAGA_DECREMENT"> | EmptyAction<"SAGA_INCREMENT">, Readonly<...>>'.
  Types of parameters 'api' and 'store' are incompatible.
    Type 'Store<EmptyAction<"DECREMENT"> | EmptyAction<"INCREMENT"> | EmptyAction<"SAGA_DECREMENT"> | EmptyAction<"SAGA_INCREMENT">, Readonly<...>>' is not assignable to type 'MiddlewareAPI<Dispatch<AnyAction>, any>'.
      The types returned by 'dispatch(...)' are incompatible between these types.
        Type 'void' is not assignable to type 'T'.  TS2345

Demo repo here: http://github.com/rtruong/react-use-redux-saga-issue

What is the expected behavior?

Compiles without errors.

A little about versions:

• OS: Ubuntu 18.04.4 LTS
• Browser (vendor and version): Chrome Version 86.0.4240.183 (Official Build) (64-bit)
• React: 16.13.1
• react-use: 15.3.4
• Did this worked in the previous package version? Yes, 12.2.0

[wrf189]

Hi

[rtruong]

Any updates on this?

[MaximilianHollis]

I'm facing this issue as well.