Function enhancer

test/typescript/enhancers.ts:17–34

    dispatch: PromiseDispatch
  }> =
    createStore =>
    <S, A extends Action, PreloadedState>(
      reducer: Reducer<S, A, PreloadedState>,
      preloadedState?: PreloadedState | undefined
    ) => {
      const store = createStore(reducer, preloadedState)
      return {
        ...store,
        dispatch: (action: any) => {
          if (action.type) {
            store.dispatch(action)
          } else if (action.then) {
            action.then(store.dispatch)
          }
          return action
        }
      }
    }

  const store = createStore(reducer, enhancer)