• • 此问题在此处已有答案**：

Argument of type 'string | null' is not assignable to parameter of type 'string'. Type 'null' is not assignable to type 'string'（10个答案）
昨天关门了。

关于代码有一个错误是"类型'字符串的参数|"null"不能赋给类型为"string"的参数。"
定义的函数为：

export const getShoppingCart = createAsyncThunk(
  "shoppingCart/getShoppingCart",
  async (jwt: string, thunkAPI) => {
    const { data } = await axios.get(
      `https://e9e0fde5-0f50-4037-af58-6b187be97f69.mock.pstmn.io/shoppingCart`,
      {
        headers: {
          Authorization: `bearer ${jwt}`,
        },
      }
    );
    return data.shoppingCartItems;
  }
);

存储类型为：

interface ShoppingCartState {
  loading: boolean;
  error: string | null;
  items: any[];
}

const initialState: ShoppingCartState = {
  loading: true,
  error: null,
  items: [],
};

切片为：

export const shoppingCartSlice = createSlice({
  name: "shoppingCart",
  initialState,
  reducers: {},
  extraReducers: {
    [getShoppingCart.pending.type]: (state) => {
      state.loading = true;
    },
    [getShoppingCart.fulfilled.type]: (state, action) => {
      state.items = action.payload;
      state.loading = false;
      state.error = null;
    },
    [getShoppingCart.rejected.type]: (
      state,
      action: PayloadAction<string | null>
    ) => {
      state.loading = false;
      state.error = action.payload;
    }
   }
  })

我的问题是有没有更规范的解决方案？我正在了解，谢谢!
我可以通过三元运算符修复它。像这样：

useEffect(() => {
    dispatch(getShoppingCart(jwt ? jwt : ''))
  }, [jwt, dispatch])