Answers for "only u can see this message in discord.js"

see if discord message is in dm discord.js

if(message.channel.type === 'dm'){
	message.channel.send("Pog");
}

discord.js get the message before

message.channel.fetchMessages({limit: 2})
.then(messageMappings => {
let messages = Array.from(messageMappings.values());
let previousMessage = messages[1];
// do something with previous message
})
.catch(error => console.log(error))