类型错误：无法读取属性'forEach'的不足

Question

无法读取属性'forEach'的内容，是我尝试运行我的机器人并且不确定如何解决它时遇到的错误...我已经尝试过查找，但是没有运气，对于discod.js来说，这是一个相当新的东西和Java脚本，因此所有帮助都将不胜枚举！

代码

const { config } = require('dotenv');

const client = new Client({
    disableEveryone: true
});

client.commands = new Collection();
client.aliases = new Collection();

config({
    path: __dirname + "/.env"
})

["command"].forEach(handler => {

});(handler => {
    require(`./handler/${handler}`)(client);
});

client.on("ready", () => {
    console.log(`Hi, ${client.user.username} is now online!`);

    client.user.setPresence({
        status: "online",
        game: {
            name: "me getting developed",
            type: "WATCHING"
        }  
    });
});

client.on("message", async message => {
    const prefix = "_";

    if (message.author.bot) return;
    if (!message.guild) return;
    if (!message.content.startsWith(prefix)) return;
    if (!message.member) message.member = await message.guild.fetchMember(message);

    const args = message.content.slice(prefix.length).trim().split(/ +/g);
    const cmd = args.shift().toLowerCase();

    if (cmd.length === 0) return;

    let command = client.commands.get(cmd);
    if (!command) command = client.commands.get(client.aliases.get(cmd));

    if (command)
        command.run(client, message, args);
});

client.login(process.env.TOKEN);