const initialState = {
  users:{},
}


const userReducer = (state = initialState, action) => {

    if (action.type == "FETCH_USERS") {

        return {
            ...state,
            users: action.payload
        }
    }

    return state;
}

ERROR in ./index.js
Module build failed: SyntaxError: C:/app/index.js: Unexpected token (78:12)

  76 |
  77 |         return {
> 78 |             ...state,
     |             ^
  79 |             users: action.payload
  80 |         // }
  81 |     }