warn.js

const discord = require("discord.js");
const fs = require("fs");
const ms = require("ms");
const warns = JSON.parse(fs.readFileSync("./warnings.json", "utf8"));

exports.run = async (client, message, args) => {

    if(!message.member.hasPermission("MANAGE_MESSAGES")) return message.channel.send("You do not have permission for this command!");

    let wUser = message.guild.member(message.mentions.users.first()) || message.guild.members.get(args[0])
    if(!wUser) return message.channel.send("Please enter a valid user!");
    if(wUser.hasPermission("MANAGE_MESSAGES")) return message.channel.send("This person cannot be warned!");
    let reason = args.join(" ").slice(22);
    if(!reason) return message.channel.send("Give a reason!");

    if(!warns[wUser.id]) warns[wUser.id] = {
        warns: 0
    };

warns[wUser.id].warns++;

fs.writeFile("./warnings.json", JSON.stringify(warns), (err) => {
    if (err) console.log(err);
});

let warnEmbed = new discord.RichEmbed()
.setTitle(`You have received a warning in the **${message.guild}** discord server!`)
.setColor("#ff0000")
.setThumbnail(client.user.displayAvatarURL)
.addField("Warned by:", message.author)
.addField("Total warnings:", warns[wUser.id].warns)
.addField("Reason:", reason);

wUser.send(warnEmbed).catch(e => {message.channel.send(`Could not send a DM message to the person!`)});


return message.channel.send(`${wUser} has been successfully warned!`)

}