discord delete after message function code example

Example 1: discord js delete message after time

message.reply('Invalid command')
  .then(msg => {
                msg.delete({ timeout: 20000 /*time unitl delete in milliseconds*/});
            })
  .catch(/*Your Error handling if the Message isn't returned, sent, etc.*/);

Example 2: discord delete message

"create a variable called id"
var id
"then inside your client message statement change id ->  id = message.id"
client.on('message', message => {
  id = message.id
});
"inside your command type  message.fetch(id).then(msg => msg.delete());"
  if (message.content === !test)
      message.fetch(id).then(msg => msg.delete());      
}});