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post.js

//...
const rootReducer = combineReducers({
//  ...
});

const sagaMiddleware = createSagaMiddleware();

// we apply saga as a simple middleware (Redux-Thunk for example)
const store = createStore(rootReducer, composeEnhancers(
    applyMiddleware(sagaMiddleware)
));

// if you have multiple watchers, you should execute .run() for every single one
sagaMiddleware.run(watchAuthSaga);

//...