Как сделать handleActions на Typescript в Redux?

Question

[lil_web]

Решил научиться делать Redux на Typesript. Пишу duck: файл с экшен-криэйторами и редьюсером.

Тайпскрипт ругается на переданные в handleActions экшен-криэйторы:

const fetchSearchSuggestionsRequest: ActionFunction1<null, Action<null>>
A computed property name must be of type 'string', 'number', 'symbol', or 'any'.ts(2464)

Подскажите, пожалуйста, что исправить.

Код duck.ts:

import { createAction, handleActions, Action } from 'redux-actions';
import { combineReducers } from 'redux';

import * as constants from './constants';

export interface ISearchSuggestion {
	name: string;
}

export const fetchSearchSuggestionsRequest = createAction<null>(
	constants.FETCH_SEARCH_REQUEST
);
export const fetchSearchSuggestionsSuccess = createAction<
	Array<ISearchSuggestion>
>(constants.FETCH_SEARCH_SUCCESS);
export const fetchSearchSuggestionsFailure = createAction<
	Array<ISearchSuggestion>
>(constants.FETCH_SEARCH_FAILURE);

const searchSuggestions = handleActions<Action<
	Array<ISearchSuggestion>
> | null>(
	{
		[fetchSearchSuggestionsRequest]: () => null,
		[fetchSearchSuggestionsSuccess]: (
			_state,
			action: Action<Array<ISearchSuggestion>>
		) => action.payload,
		[fetchSearchSuggestionsFailure]: (
			_state,
			action: Action<Array<ISearchSuggestion>>
		) => action.payload
	},
	null
);

export default combineReducers({
	searchSuggestions
});

Документация. Redux + Typescript
Документация. handleActions