message delete discord js

1message.reply('Invalid command')
2  .then(msg => {
3                msg.delete({ timeout: 20000 /*time unitl delete in milliseconds*/});
4            })
5  .catch(/*Your Error handling if the Message isn't returned, sent, etc.*/);

1client.on('messageDelete', (messageDelete) => {
2    //Your code
3});
4
5//Note, you have to define client.
6//Its best to run these events through something called a "event handler"

1message.delete()

1message.channel.send("Hello World!").then(msg=>msg.delete({timeout:"2000"/*Time until delete in milliseconds*/})

1// ASSUMPTIONS:
2// channel: the channel you want the message to be sent in
3// lastmsg: the id of the last poll message
4
5channel.fetchMessage(lastmsg).then(msg => msg.delete());
6