index.js

const { Client, MessageEmbed: RichEmbed } = require('discord.js');
const config = require("./config.json");
const axios = require('axios');
const { Util } = require('discord.js')

const client = new Client({intents: ["GUILDS", "GUILD_MESSAGES"]});

//This is what the bot looks for if set to ? then ?fr Test will translate to French
const prefix = "?"; 

//DeepL authorization key
let auth_key = '';

//Use this to restrict the ability to translate to users with this role leave as '' to disable user role checking
const accessRole = '';

//Free Version
const deeplApi = 'https://api-free.deepl.com/v2/translate?';

//Paid Version
//const deeplAPI = "https://api.deepl.com/v2/translate";

client.on('messageCreate', message => {
  if (message.author.bot) return;
    if (!message.content.startsWith(prefix)) return;

    const commandBody = message.content.slice(prefix.length);
    const command = commandBody.split(' ')[0];
    const messageBody = commandBody.replace(command,'');
    
    if (command === "ping") {
	    const timeTaken = Date.now() - message.createdTimestamp;
	    message.reply(`Pong! This message had a latency of ${timeTaken}ms. `);
    }else if(command === "test"){
	    message.reply(` Message: ` + messageBody);
    }else if(command === "help"){
	    showHelp(message,"");
    } else{
        if (accessRole == "" || message.member.roles.cache.some(role => role.name.toLowerCase() === accessRole.toLowerCase())) {
            const target_lang = command;
            let transMessage = Util.cleanContent(message.content, message);

            //todo clean this up
            transMessage = transMessage.replace(command,'');
            transMessage = transMessage.replace(prefix,'');

            post(transMessage, target_lang).then(response => {
                if (response.data.translations.length === 1){
                    embedReply(message,response.data.translations[0],target_lang,messageBody);
                }else{
                    message.channel.send("ERROR: " + messageBody);
                }
            });
        }else{
            message.channel.send("Access Denied: "+ message.author.username +"\nMissing Required role of "+ accessRole);
        }
    }
});

const post = (message, lang) => {
  return axios.post(deeplApi +
    'auth_key=' + auth_key +'&' + 
    'text=' + encodeURIComponent(message) + '&' +
    'target_lang=' + lang)
}

const embedReply =(message, translations, lang, org) => {
    const exampleEmbed = new RichEmbed()
	.setColor('#0099ff')
	.setTitle(translations.text)
	.setAuthor(message.author.username, message.author.avatarURL())
	.setDescription(org)
	.setTimestamp()
	.setFooter(translations.detected_source_language.toUpperCase() + ' -> ' + lang.toUpperCase()+ " "+ org.length + " to " + translations.text.length + " characters");
    message.delete();
    message.channel.send({ embeds: [exampleEmbed] });
}

const showHelp =(message) => {
    const exampleEmbed = new RichEmbed()
        .setColor('#0099ff')
        .setTitle("Translation-Bot Help")
        .setDescription("This bot is used to translate text\n\nType `" + prefix +"de Hello` to translate Hello to German\n\nMost launguages are supported, change `de` to one of the supported launguage codes and try it\n\nBG - Bulgarian\nCS - Czech\nDA - Danish\nDE - German\nEL - Greek\nEN - English\nES - Spanish\nET - Estonian\nFI - Finnish\nFR - French\nHU - Hungarian\nIT - Italian\nJA - Japanese\nLT - Lithuanian\nLV - Latvian\nNL - Dutch\nPL - Polish\nPT - Portuguese (all Portuguese varieties mixed)\nRO - Romanian\nRU - Russian\nSK - Slovak\nSL - Slovenian\nSV - Swedish\nZH - Chinese\n")
        .setFooter("© 2022 RRiVEN LLC");
    message.delete();
    message.channel.send({ embeds: [exampleEmbed] });

}
client.login(config.BOT_TOKEN);