问如何确保Discord.JS机器人在重新启动时不会擦除所有对象？

EN

let optIn = {}

let optIn = {}

const commands = {
    optIn: PREFIX + "optIn"
}

bot.on("message", msg => {
    if (msg.content === commands.optIn) {
        optIn[msg.guild.id] = msg.author.id
        msg.channel.send("**WARNING** You are now going to receive messages when someone makes a new invite.")
    }
})

bot.on("inviteCreate", event => {
    if(!optIn[event.guild.id]) {
        event.guild.systemChannel.send("Looks like an invite was made but the server has no user to send invite alerts to. If you want to opt in, send `amඞgus:optIn` to any channel in the server.")
    } else {
        bot.users.fetch(optIn[event.guild.id]).then(r => {
            r.send("**INVITE MADE**\nAn invite was made by <@!" + event.inviter.id + ">, in a server called `" + event.guild.name + "` and the Invite URL is `" + event.url + "`.")
        })
    }
})