React Redux Reducer with TypeScript

Store.ts

const peopleReducer: Reducer<IPeopleState, PeopleActions> = (
  state = initialPeopleState,
  action,
) => {
  switch (action.type) {
    case 'GettingPeople': {
      return {
        ...state,
        loading: true,
      };
    }
    case 'GotPeople': {
      return {
        ...state,
        people: action.people,
        loading: false,
      };
    }
    case 'PostingPerson': {
      return {
        ...state,
        posting: true,
      };
    }
    case 'PostedPerson': {
      return {
        ...state,
        posting: false,
        people: state.people.concat(action.result.person),
      };
    }
    default:
      neverReached(action); // when a new action is created, this helps us remember to handle it in the reducer
  }
  return state;
};

// tslint:disable-next-line:no-empty
const neverReached = (never: never) => {};

const rootReducer = combineReducers<IAppState>({ peopleState: peopleReducer });