discord.js v12: How do I await for messages in a DM channel?

Question

This is the code that I've tried:

message.author.dmChannel.awaitMessages(msg => {
    console.log(msg.content)
});

But it returns this error message:

TypeError: Cannot read property 'awaitMessages' of null

Updated Code:

message.author.send("What is your name?")

const filter = m => m.author.id === message.author.id

message.author.dmChannel.awaitMessages(filter)
     .then((collected) => console.log(collected.first().content))

Answer 1

You're not using awaitMessages() properly, you need to pass a filter

const filter = (m) => m.author.id === message.author.id
message.author.dmChannel.awaitMessages(filter)
  .then((collected) => console.log(collected.first().content))

Answer 2

You should try to create a DM channel first:

let channel = message.author.dmChannel;
if (!channel) channel = await message.author.createDM();

Please note that createDM() returns a Promise, which will require you to switch your command to an async function instead (if it already was not)