Getting number of members and servers a bot is serving

Question

So I went through the discord.js guide, and found that client.guilds.size and client.users.size is for finding no of users and servers a bot is on. But

Answer 1

Try client.guilds.cache.size and client.users.cache.size. This changed in discord.js v12.

client.users has been changed from a Collection to a Manager.

client.guilds has been changed from a Collection to a Manager.