Typescript npm library can't export Redux store please advice

Question

I use the Notistack library and forked it and then using VSCode to try to add a Redux store in the library that I want to expose to Apps.

I'm not so good with Typescript. I have some trouble hehe.

What I want to do is that when the app is using Notistack to show a snack message. I want to use Redux to update the message in real time, like a file up/download progress showing on the snack. It's here Notistack new Redux store(that i create here) come into play. I want Notistack to expose the Redux store to the app so the app can send redux dispatch into to Notistack Redux Store. and showing dispatched message in the Notistack SnackbarItem.tsx
(hope you understand)

When I compile in VSCode I get this error in my app:

Failed to compile.

./src/redux/root-reducer.js
Attempted import error: 'notistack' does not contain a default export (imported as 'NotisReducer'). 

My root-reducer in the App look like this:

import { combineReducers } from 'redux';
import NotisReducer from 'notistack';
import snackReducer from './snackbar/snack.reducer';

const rootReducer = combineReducers({
    snack: snackReducer,
    NotisReducer,
});
export default rootReducer;

As you see I import Notistack's NotisReducer and I think I have implemented that.

(I have used NPM link to add locally forked Notistack library into my app)

Now it looks like this here is Notistack's indext.js file where I expose Redux store as NotisReducer:

What I did in Notistack was I added a to index.d.ts:

I define the type store like this:

import * as React from 'react';
import { SnackbarClassKey } from '@material-ui/core/Snackbar';
import { ClickAwayListenerProps } from '@material-ui/core/ClickAwayListener';
import { TransitionProps } from '@material-ui/core/transitions/transition';
import { StandardProps } from '@material-ui/core';
import store from './Redux/store'; // MY STORE
...
...
export type store = store; // EXPORT IT

I'm not sure if this is correct as I could not set breakpoint in npm linked Notistack. Maybe it's to many problem now that must be fixed first.

In the file
SnackbarProvider.tsx
I did like this, importing the store type from index.d.ts):

import {
  SnackbarProviderProps,
  SnackbarKey,
  SnackbarMessage,
  OptionsObject,
  RequiredBy,
  ProviderContext,
  TransitionHandlerProps,
  store, //  STORE
} from ".";
import createChainedFunction from "./utils/createChainedFunction";

export { store }; // EXPOSING IT 

In the file
NotisReducer.js
I import the store to be sent to indext.js above

But as you saw above I get compiler error store is not exported.

Attempted import error: 'notistack' does not contain a default ex (imported as 'NotisReducer'). 

please advice :))