Discord.js v13 (valor intermedio).setToken(…) no es una función.

Soy nuevo en Discod.js v13. Recibo este error:

    (async () => {
    ^

TypeError: (valor intermedio) no es una función

Este es el código que creo que es el problema

const rest = new REST({
        version: "9"
    }).setToken("MyToken")
    (async () => {

Si necesitas el código completo:

const { Client, Intents, Collection } = require("discord.js")
const fs = require("fs")
const {REST} = require("@discordjs/rest");
const {Routes} = require("discord-api-types/v9");
const client = new Client({
    intents:[
        Intents.FLAGS.GUILDS,
        Intents.FLAGS.GUILD_MESSAGES
    ]
})
const BotName = "TestBot"

const commandFiles = fs.readdirSync("./commands").filter(file => file.endsWith(".js"));

const commands = []

client.commands = new Collection()

for(const file of commandFiles){
    const command = require("./commands/"+file)
    commands.push(command.data.toJSON());
    client.commands.set(command.data.name, command)
}

client.once("ready", applicationId =>{
    console.log(`${BotName} is now online`)

const CLIENT_ID = client.user.id

const rest = new REST({
    version: "9"
}).setToken("MyToken")
(async () => {
    try{
        if(process.env.ENV === "production"){
           await rest.put(Routes.applicationCommands(CLIENT_ID), {
               body: commands
           })
            console.log("Success command register globally")
        }else{
            await rest.put(Routes.applicationGuildCommands(CLIENT_ID, process.env.GUILD_ID), {
                body: commands
            })
            console.log("Success command register locally")
        }
    }catch(err){
     console.log(err)
    }
})();

})
client.on("interaction", async interaction =>{
    if(!interaction.isCommand()) return

const command = client.commands.get(interaction.commandName)

if(!command) return
try{
     await command.execute(interaction);
}catch(err){
    console.log(err)
    await interaction.reply({
        content: "ERROR" + err,
        ephemeral:true
    })
}

})
client.login("MyToken")