typescript - thunkAPI.getState 不是函数 : Error with reduxtoolkit and jest

Question

我正在使用 createAsyncThunk 并使用 jest/ReduxToolkit/TypeScript 为其编写测试。

这是我的切片。

export const getUsers = createAsyncThunk<object[], undefined, { state: RootState }>(
  'user/getUsers',
  (_: undefined, thunkAPI) => {
    const { users } = thunkAPI.getState().user;
    if (!users) {
      // fetch users
    }
    return users;
  },
);

const userSlice = createSlice({
  name: 'user',
  initialState: {
    users: [],
  },
  reducers: {},
  extraReducers: (builder) => {
    builder
      .addCase(getUsers.fulfilled, (state, action) => {
        state.users = action.payload;
      });
  },
});

export default userSlice;

这是我的测试。

let store: EnhancedStore;

beforeEach(() => {
  store = configureStore({
    reducer: {
      user: userSlice.reducer,
    },
  });
});

describe('userSlice', () => {
  test('getUsers success', async () => {
    const state = await getUsers();
    const result = await state(store.dispatch, store.getState(), undefined);
    console.log(result)
    expect(result.type).toBe('user/getUsers/fulfilled');
    expect(result.meta.requestStatus).toBe('fulfilled');
  });
});

当我运行测试时，我收到错误和日志输出:

{type: 'user/getUsers/rejected',payload: undefined,meta: {arg: undefined,requestId: '***************',rejectedWithValue: false,requestStatus: 'rejected',aborted: false,condition: false},error: {name: 'TypeError',message: 'thunkAPI.getState is not a function',stack: 'TypeError: thunkAPI.getState is not a function\n' + // omitted}}

所以我理解错误消息 TypeError: thunkAPI.getState is not a function 指出切片中的 thunkAPI.getState() 导致错误，但它并没有使用网络浏览器运行时会导致任何错误。

有人有想法吗？谢谢。

版本

• react-redux v7.2.5
• reduxjs/工具包 v1.6.1
• Jest v27.0.6
• ts-jest v27.0.5

Answer 1

推断出的state变量的TS类型是:

const state: (dispatch: ThunkDispatch<any, unknown, AnyAction>, getState: () => any, extra: unknown) => Promise<PayloadAction<object[], string, {
    arg: undefined;
    requestId: string;
    requestStatus: "fulfilled";
}, never> | PayloadAction<...>> & {
    ...;
}

您应该将 store.getState 而不是 store.getState() 传递给 state。所以应该是:

const result = await state(store.dispatch, store.getState, undefined);

不是:

const result = await state(store.dispatch, store.getState(), undefined);