What causes the transformation of "boolean" into "false & true" in the PayloadAction within redux-starter-kit?

In my React project, I am utilizing redux-starter-kit. I am currently working on specifying the type of action payload in the reducer using the createSlice method.

I have implemented two reducers:

setFetchingMenuItems: (
  state: IPagesState,
  { payload }: PayloadAction<boolean>
) => {
  state.isFetchingMenuItems = payload;
},
setMenuItems: (
  state: IPagesState,
  { payload }: PayloadAction<IMenuItemViewModel[]>
) => {
  state.menuItems = payload;
},

The second reducer functions as intended. When I dispatch the setMenuItems action, it only accepts an array of IMenuItemViewModel.

However, when I attempt to dispatch the setFetchingMenuItems action with a payload of true or false, TypeScript throws an error: "TS2345: Argument of type 'false' is not assignable to parameter of type 'false & true'."

What could I be overlooking?

UPDATE:

Below is my asynchronous method where I dispatch actions:

export const fetchMenuItems = () => async (
  dispatch: Dispatch
): Promise<void> => {
  dispatch(setFetchingMenuItems(true));

  try {
    const { value } = await PageService.getMenuItems();

    dispatch(setMenuItems(value));
  } catch (e) {
    console.log(e);
  }

  dispatch(setFetchingMenuItems(false));
};

The TypeScript version being used is 3.5.1.

Answer №1

The issue was identified within redux-starter-kit (specifically version 0.5.1). I found that upgrading to version 0.6.0 resolved the problem. I proceeded to update to 0.6.2 and successfully resolved the issue.

Answer №2

There appears to be an ongoing discussion about the expansion of true | false in Typescript, with some noting that it is currently expanded to false & true instead of false | true.

A potential solution to this issue is to replace instances of boolean with false | true.

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