I am making a discord bot, and I want to do this: someone type -ping and the bot responds with @theuserwhotyped-ping.

I have no errors, I just don't know how to code it, and I don't find any solution on the Internet.

Here is the code I made:

const Discord = require("discord.js");

const client = new Discord.Client();

const prefix = "-";

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


const args = message.content.slice(prefix.length).split(" ");
const command = args.shift().toLowerCase();

if (command === "ping"){
    message.channel.send("@{user}); //this is the line which dont work
    }
});