const prefix = '!';

client.on('messageCreate', async message => {
    if (message.author.bot) return;
    if (message.channel.type === ChannelType.DM) return;

    if (message.content.startsWith(prefix + 't')) {
        const args = message.content.slice(prefix.length + 2).split(' ');

        const repliedTo = await message.channel.messages.fetch(message.reference.messageID);
        if (!repliedTo) {
            return message.reply('Could not find the referenced message.');
        }

        const contentToTranslate = repliedTo.content;

        translate(`${contentToTranslate}`, { to: 'en' })
            .then(res => {
                console.log(res.text);

                message.reply(`Translation: ${res.text}`);
            })
            .catch(err => {
                console.error(err);
            });
    }
});