I'd got rid of action types and I'd have only actions (action creators). No strings, the function (reference) is used later for comparisons.
export const addTodo = (id, title) => ({ id, title });
export const removeTodo = id => ({ id });
actions({ addTodo, removeTodo }); // Connect it to actions.addTodo & actions.removeTodo.
That's it. They define what your app can do.