In my work teamLeader always said that if you use forEach, that means you do sth wrong. I think using interface in that clear case is useless and you should use ES6 feature and use reduce. With this code will be cleaner, faster and better.

Using enum for switch case it's good practice, but here is unnecessary. It's like shooting to sparrow from cannon. You could just pass list[0] it's much simpler than list[LIKES_LIST_MEMBER_COUNT.ONE]. Because of that your return is harder to read than ${list[0]}, ${list[1]} and ${list[2]} like this.