Echo JS 0.11.0

This method removes the possibility of Flow type hints.

That's a good point. I'll see what I can do to make the Flow type check possible again. Thanks.

The reason you declare your action types separately is so you can export them for use in your reducer.

You are right. That's why I added ability to get the type without instantiation of the action.

const setVisibilityFilter = action('SET_VISIBILITY_FILTER', 'filter');

function todoApp(state = initialState, action) {
  switch (action.type) {
    case setVisibilityFilter.type:
      return Object.assign({}, state, {
        visibilityFilter: action.filter
      });
    default:
      return state;
  }
}

A-ha! Carry on. :)