Expecting a return value from CreateAsyncThunk

I need help converting the following JavaScript code to TypeScript. I keep running into an error message that says

Expected to return a value at the end of async arrow function
. Can someone help me figure out what's wrong with this code?

export const loginUser = createAsyncThunk(
  'users/login',
  async ({ email, password }, thunkAPI) : Promise<any> => {
    try {
      const response = await fetch(
        'https://mock-user-auth-server.herokuapp.com/api/v1/auth',
        {
          method: 'POST',
          headers: {
            Accept: 'application/json',
            'Content-Type': 'application/json',
          },
          body: JSON.stringify({
            email,
            password,
          }),
        }
      );
      const data = await response.json();
      console.log('response', data);
      if (response.status === 200) {
        localStorage.setItem('token', data.token);
        return data;
      }
      return thunkAPI.rejectWithValue(data);
    } catch (e) {
      console.log('Error', e.response.data);
      thunkAPI.rejectWithValue(e.response.data);
    }
  }
);

Answer №1

Make sure to include

return thunkAPI.rejectWithValue(e.response.data);
within your catch block.

If you omit the return statement, the function will not execute properly - leading to the error you are currently experiencing.

Answer №2

Your specified the return type within the arrow function (which serves as the second parameter of the createAsyncThunk function). When you return a default value, it is considered resolved. Here is an example:

export const loginUser = createAsyncThunk(
'users/login',
async ({ email, password }, thunkAPI) : Promise<any> => {
try {
  const response = await fetch(
    'https://mock-user-auth-server.herokuapp.com/api/v1/auth',
    {
      method: 'POST',
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        email,
        password,
      }),
    }
  );
  const data = await response.json();
  console.log('response', data);
  if (response.status === 200) {
    localStorage.setItem('token', data.token);
    return data;
  }
  return thunkAPI.rejectWithValue(data);
} catch (e) {
  console.log('Error', e.response.data);
  thunkAPI.rejectWithValue(e.response.data);
}
return Promise.resolve();
}
);

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