Helper function for allowing mentions and ids discord.js

mentionparser.js

// Channel

function channel(args) {
  if (!args) return false;
  if (args.startsWith('<#') && args.endsWith('>')) {
    args = args.slice(2, -1);
    return client.channels.cache.get(args);
  } else {
    if (!client.channels.cache.get(args)) return false;
    return client.channels.cache.get(args)
  }
}

// User

function user(args) {
  if (!args) return false;
  if (args.startsWith('<@') && args.endsWith('>')) {
    args = args.slice(2, -1);
    if (args.startsWith('!')) {
      args = args.slice(1);
    }
    return client.users.cache.get(args);
  } else {
    if (!client.users.cache.get(args)) return false;
    return client.users.cache.get(args)
  }
}

// Example Usage
/*
client.on("message", (message) => {
  if (message.author.bot || !message.guild) return;
  if (!message.content.startsWith(prefix)) return;
  const prefix = "!";
  const args = message.content.slice(prefix.length).trim().split(" ");
  const command = args.shift().toLowerCase();
  
  if (command === "ping") {
    if (!args.length) return message.channel.send("Mention or provide the id of the user to ping.")
    const userToPing = user(args[0])
    if (!userToPing) return message.channel.send("Mention or provide the VALID id of the user to ping.")
    message.channel.send("<@" + userToPing.id + ">")
  }
});
*/