Class DeletedMessage

Telegram does not send information about where a message was deleted if it occurs in private conversations with other users or in small group chats, because message IDs are unique and you can identify the chat with the message ID alone if you saved it previously.

GramJS does not save information of where messages occur, so it cannot know in which chat a message was deleted (this will only work in channels, where the channel ID is present).

This means that the chats: parameter will not work reliably, unless you intend on working with channels and super-groups only.

async function deletedMessageEventPrint(event: DeletedMessageEvent) {

  for (let index = 0; index < update.deletedIds.length; index++) {
    const deletedMsgId = update.deletedIds[index];
    console.log(`Message ${deletedMsgId} was deleted.`)
  }

}
// adds an event handler for deleted messages
client.addEventHandler(deletedMessageEventPrint, new DeletedMessage({}));