Send message and shortly delete it

Question

I'm trying to make a Discord bot delete its "system messages" after, say, 10 seconds, because I've been seeing a lot of "Invalid command" errors and "Done!" notifications, and I'd like to clear them out for actual messages. This is different from deleting messages where the user has a command; I already have that capability.

Answer 1

I recommend you send the message, wait for the response and delete the returned message after that time. Here's how it'd work now:

message.reply('Invalid command')
  .then(msg => {
    setTimeout(() => msg.delete(), 10000)
  })
  .catch(/*Your Error handling if the Message isn't returned, sent, etc.*/);

See the Discord.JS Docs for more information about the Message.delete() function and the Node Docs for information about setTimeout().

Old ways to do this were:

Discord.JS v12:

message.reply('Invalid command')
  .then(msg => {
    msg.delete({ timeout: 10000 })
  })
  .catch(/*Your Error handling if the Message isn't returned, sent, etc.*/);

Discord.JS v11:

message.reply('Invalid command')
  .then(msg => {
    msg.delete(10000)
  })
  .catch(/*Your Error handling if the Message isn't returned, sent, etc.*/);