Discord.js autorole from username - discord.js

Question

I want to make my bot autorole if username of anyone member contains a specific tag and the code i made isn't working, bot starts fine but didn't assign role if user have tag in username than also so i thought to use stackoverflow to get some help
Here is the code:
client.on("userUpdate", async (oldUser, newUser) => {
if (oldUser.username !== newUser.username) {
let tag = "⚡";
let server_id = "793143091350470708";
let role = "888436049620119562";
if (newUser.username.includes(tag) && !client.guilds.get(server_id).members.get(newUser.id).roles.has(role)) {
client.guilds.get(server_id).members.get(newUser.id).addRole(role)
} if (!newUser.username.includes(tag) && client.guilds.get(server_id).members.get(newUser.id).roles.has(role)) {
client.guilds.get(server_id).members.get(newUser.id).removeRole(role)
}
}
})

Answer 1

You would require to define USER_UPDATE, GUILD_MEMBER_UPDATE, and
PRESENCE_UPDATE intents if you are on discord.js version 13 and further enable the members and presence intent too, they can be located in the Discord Developer Portal further I would like to suggest using the Client#guildMemberUpdate listener instead since your code has nothing to do with presence you would not need the "extra" intents.
Additional Information
Directed by this comment It has come to my notice that you are using version 12 of discord.js so you would want to make adequate changes to your code for that ( your code as it currently is, is clearly written for discord.js v11) the following changes would be made in your code:
client.on("guildMemberUpdate", async (oldUser, newUser) => {
if (oldUser.username !== newUser.username) {
let tag = "⚡";
let server_id = "793143091350470708";
let role = "888436049620119562";
if (newUser.username.includes(tag) && !client.guilds.cache.get(server_id).members.cache.get(newUser.id).roles.has(role)) {
client.guilds.cache.get(server_id).members.cache.get(newUser.id).roles.add(role)
} if (!newUser.username.includes(tag) && client.guilds.cache.get(server_id).members.cache.get(newUser.id).roles.has(role)) {
client.guilds.cache.get(server_id).members.cache.get(newUser.id).roles.remove(role)
}
}
})