Select a random user from a collection of users who reacted to the first reaction of a message via a given message ID. Example code is used for giveaways.

app.js

// THIS IS FOR
const { Client } = require('discord.js');
const client = new Client();

const g_channel_id = ''; // This should be a String and the channel ID of the giveaways channel
const g_message_id = ''; // This should be a String and the message ID of the givaway message
const winner_amount = ''; // This shiuld be a Number and it represents how many winners you wish to choose

client.on('ready', () => {
  console.log('Bot is ready!');
};
          
client.on('message', async message => {
  if (message.author.bot) return;
  
  if (message.content.startsWith('randomuser')) {
    let c = message.guild.channels.find(c => c.name === 'giveaways');
    let m = await c.fetchMessage(MESSAGE_ID);
    let reactions = m.reactions;
    let reaction = reactions.first(); // This reaction would normally be the reaction a user would use to enter the giveawahy
    let users = reaction.users.map(u => u.toString());
    return message.channel.send(`**${users.random()}** has won the giveaway!`); // this uses the Array.prototpe.random method below
  
    const c = message.guild.channels.get(g_channel_id);
    const m = await c.fetchMessage(g_message_id);
    const reactions = m.reactions;
    const reaction = reactions.first(); // This reaction would normally be the reaction a user would use to enter the giveaway
    const users = reaction.users.map(u => u.toString());
    if (winner_amount == 1) {
    	return c.send(`**${users.random()}** has won the giveaway!`); // this uses the Array.prototpe.random method below
    } else {
    	let winners;
    	const selected = randomAmount(users, winner_amount); // this uses the Array.prototype.randomAmount method below

    	if (winner_amount === 2) winners = selected.join(' and ');
    	else winners = selected.join(', ');

    	return c.send(`**${winners}** have won the giveaway!`);
    }
  }      
});

client.login(TOKEN);

Array.prototype.random = function () {
  return this[Math.floor(Math.random() * this.length)];
};

Array.prototype.randomAmount = function (array, length) => {
	let arr = [];
	for (let i = 0; i < length; i++) {
		arr.push(array.random());
	}

	return arr;
};

its give error
:(
can you help

I don't maintain this piece of code anymore, sorry. Also, I'm not a wizard or a super computer, so giving me so little information doesn't help me.