export interface GatewayThreadMembersUpdate
https://discord.com/developers/docs/topics/gateway-events#thread-members-update-thread-members-update-event-fields
optionalAPIThreadMember[] added_members? :
The members that were added to the thread
Snowflake guild_id :
The id of the guild that the thread is in
Snowflake id :
The id of the thread for which members are being synced
number member_count :
The approximate member count of the thread, does not count above 50 even if there are more members
optionalSnowflake[] removed_member_ids? :
The ids of the members that were removed from the thread