Rocket.Chat/app/livechat/server/api/lib/messages.js

import { LivechatExternalMessage } from '../../../../models/server/raw';

export async function findExternalMessages({ roomId, pagination: { offset, count, sort } }) {
	const cursor = await LivechatExternalMessage.findByRoomId(roomId, {
		sort: sort || { ts: -1 },
		skip: offset,
		limit: count,
	});

	const total = await cursor.count();

	const messages = await cursor.toArray();

	return {
		messages,
		count: messages.length,
		offset,
		total,
	};
}