reusable reducer pattern

reusable-reducer.ts

interface IUserState {
    "users": IUser[],
    "selected_user": IUser,
    "sort": ISort
}

const initial_state: IState {
    "users": [],
    "selected_user": {},
    "sort": {
        "name": "desc"
    }
}

const createUserReducer = (type: string) => {
    return (state = initial_state, action: any): IUserState => {
        case `FETCH_COMPLETE_${type}`: {
            return {
                "users": action.payload,
                "selected_user": state.selected_user,
                "sort": state.sort
            }
        }
        case `SELECT_COMPLETE_${type}`: {
            return {
                "users": state.users,
                "selected_user": action.payload,
                "sort": state.sort
            }
        }
        case `SORT_${type}`: {
            return {
                "users": state.users,
                "selected_user": state.selected_users,
                "sort": action.payload
            }
        }
        case `SORT_COMPLETE_${type}`: {
            return {
                "users": action.payload,
                "selected_user": state.selected_users,
                "sort": state.sort
            }
        }
    }
}

export interface IStoreState {
    "adminstrators": IUserState
    "editors": IUserState
}

const rootReducer = combineReducers({
    "adminstrators": createUserReducer("administrators"),
    "editors": createUserReducer("editors")
})