Optional
added_The members that were added to the thread
The id of the guild that the thread is in
The id of the thread for which members are being synced
The approximate member count of the thread, does not count above 50 even if there are more members
Optional
removed_The ids of the members that were removed from the thread
Generated using TypeDoc
https://discord.com/developers/docs/topics/gateway-events#thread-members-update-thread-members-update-event-fields