async run Method

async is a simple way to make your Promise-Powered code look extremely neat. Normally with promises, we would use .then to continue running the command after the promise has resolved.

msg.say('Hi').then(message => {
    message.edit('Hello');
});

However, async can make this much easier to do.

const message = await msg.say('Hi');
message.edit('Hello');

Now we've completely dropped the indentation, and our code looks cleaner because of it.

Let's modify our first command, reply, to edit the message after it has been sent, and let's use async to do it.

First, mark the run method with the async keyword.

async run(msg) {
    return msg.say('Hi, I\'m awake!');
}

Now, let's edit the message we send from 'Hi, I'm awake!' to 'I want to go to bed.'.

async run(msg) {
    const message = await msg.say('Hi, I\'m awake!');
    return message.edit('I want to go to bed.');
}

You can await anything that returns a Promise. In other words, anything you can perform a .then on can be swapped with await. async is very useful for making code cleaner, especially if you have lots of Promises you're performing .then on.

In the end, our Reply command looks like this:

const { Command } = require('discord.js-commando')

module.exports = class ReplyCommand extends Command {
    constructor(client) {
        super(client, {
            name: 'reply',
            group: 'group1',
            memberName: 'reply',
            description: 'Replies with a Message.'
        });
    }

    async run(msg) {
        const message = await msg.say('Hi, I\'m awake!');
        return message.edit('I want to go to bed.');
    }
};

Now just remember, don't use async for everything.