How to check if members having a particular role are present in a particular voice channel in discord.js - discord.js

Question

I'm trying to find if any member having a particular role id is present in a particular voice channel. If even 1 member having the particular role id is present in that particular voice channel, then only those members can use the commands of music bot.
From my research, I have came to know that voiceStateUpdate may help but the problem is I don't know how to use it in my codes(cause I am new to JavaScript). Here is the link to the documentation:
https://discord.js.org/#/docs/main/stable/class/Client?scrollTo=e-voiceStateUpdate .
Here is a part of my code:
client.on('voiceStateUpdate', (oldMember, newMember) => {
});
client.on('message', async message => {
if (message.author.bot) return
if (!message.content.startsWith(prefix)) return
let messageArray = message.content.split(" ");
let cmd = messageArray[0];
const args = message.content.substring(prefix.length).split(' ');
const searchString = args.slice(1).join(' ')
const url = args[1] ? args[1].replace(/<(._)>/g, '$1') : ''
const serverQueue = queue.get(message.guild.id)
if() { //the conditional statement I am trying to put here but I don't know how to do it properly
if (message.content.startsWith(`${prefix}play`)) {
const voiceChannel = message.member.voice.channel
if (!voiceChannel) return message.channel.send("You need to be in a voice channel to play music")
.......
So the main thing is that I don't know what to write their exactly in the if statement that would make my code work properly.

Answer 1

client.on("message", async message => {
// Checking if the message author is a bot.
if (message.author.bot) return false;
// Checking if the message was sent in a DM channel.
if (!message.guild) return false;
// The role that can use the command.
const Role = message.guild.roles.cache.get("RoleID");
// The voice channel in which the command can be used.
const VoiceChannel = message.guild.channels.cache.get("VoiceChannelID");
if (message.content.toLowerCase() == "test") {
// Checking if the GuildMember is in a VoiceChannel.
if (!message.member.voice.channel) return message.reply("You need to be in a voice channel.");
// Checking if the GuildMember is in the required VoiceChannel.
if (message.member.voice.channelID !== VoiceChannel.id) return message.reply("You are in the wrong VoiceChannel.");
// Checking if the GuildMember has the required Role.
if (!message.member.roles.cache.has(Role.id)) return message.reply("You are not allowed to execute this command.");
// Execute your command.
return message.reply("Command executed");
};
});

Answer 2

So from what I can understand, you want the command to only execute when a user with the role 'Example Role' is in the channel 'Example Channel'
For this you will need the role id and the channel id.
client.on("message", async message => {
if (message.author.bot) return;
if (!(message.guild)) return;
var roleID = 'RoleID';
var vc = message.guild.channels.cache.get("VoiceChannelID");
if (message.content.toLowerCase() == "test") {
canUse = false;
vc.members.forEach((member) => {
if (member.roles.has(roleID)) {
canUse = True;
}
})
if (!(canUse)) { // nobody in the voice channel has the role specified.
return;
}
console.log("A member of the voice channel has the role specified")
}
});