useReducer

Run them outside the reducer, then dispatch an action with the result
Reducers must be pure, so requests and other asynchronous side effects belong outside the reducer, such as in an event handler or Effect. When the operation completes, dispatch an action containing its result so the reducer can calculate the next state.
Perform them directly inside the reducer
Dispatch unresolved promises to the reducer
Use React's built-in useAsyncReducer hook