An event's comment (unrelated to comments in bundles) can be a lot of things depending of the event type

interface WithDiscussionidPostidOldgenreNewgenre {
    beatmap_discussion_id: null | number;
    beatmap_discussion_post_id: null | number;
    new:
        | "Any"
        | "Unspecified"
        | "Video Game"
        | "Anime"
        | "Rock"
        | "Pop"
        | "Other"
        | "Novelty"
        | "Hip Hop"
        | "Electronic"
        | "Metal"
        | "Classical"
        | "Folk"
        | "Jazz";
    old:
        | "Any"
        | "Unspecified"
        | "Video Game"
        | "Anime"
        | "Rock"
        | "Pop"
        | "Other"
        | "Novelty"
        | "Hip Hop"
        | "Electronic"
        | "Metal"
        | "Classical"
        | "Folk"
        | "Jazz";
}

Hierarchy (view full)

Properties

beatmap_discussion_id: null | number
beatmap_discussion_post_id: null | number
new:
    | "Any"
    | "Unspecified"
    | "Video Game"
    | "Anime"
    | "Rock"
    | "Pop"
    | "Other"
    | "Novelty"
    | "Hip Hop"
    | "Electronic"
    | "Metal"
    | "Classical"
    | "Folk"
    | "Jazz"
old:
    | "Any"
    | "Unspecified"
    | "Video Game"
    | "Anime"
    | "Rock"
    | "Pop"
    | "Other"
    | "Novelty"
    | "Hip Hop"
    | "Electronic"
    | "Metal"
    | "Classical"
    | "Folk"
    | "Jazz"