Discord.js ReferenceError: bot is not defined - node.js

Question

I am trying to create a bot, which will be given the role when user joins the server by link, but this doesn't work.
Error:
C:\DGhostsBot\bot.js:45
bot.on("guildMemberAdd", (member) => {
^
ReferenceError: bot is not defined
at Object.<anonymous> (C:\DGhostsBot\bot.js:45:1)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)
My code here:
const Discord = require('discord.js');
const client = new Discord.Client();
var prefix = "dg!"
client.login(`**************************************************************`);
client.on("message", (message) => {
if(message.content == prefix + "test") {
message.reply("just a command that is used for performance testing. Do not pay attention.");
}
});
client.on("message", (message) => {
if(message.content == prefix + "cake") {
message.reply("here's your cake :3 :cake: ");
}
});
client.on("message", (message) => {
if(message.content == prefix + "help") {
message.reply("it's in development");
}
});
client.on("message", (message) => {
if(message.content == prefix + "kick") {
if(message.member.roles.some(r=>["Developer", "devadmin"].includes(r.name)) ) {
const user = message.mentions.users.first();
if (user) {
const member = message.guild.member(user);
if (member) {
member.kick()
}
}
} else {
message.reply("!!!!ACCESS_DENIED!!!!").then(sentMessage => sentMessage.delete("delete"));
}
}
});
bot.on("guildMemberAdd", (member) => {
if (member.id == bot.user.id) {
return;
}
let guild = member.guild
guild.fetchInvites().then(invdat => {
invdat.forEach((invite, key, map) => {
console.log(invite.code)
if (invite.code === "qQAkqFQ") {
return member.addRole(member.guild.roles.find(role => role.name === "Member"));
}
})
})
});
I check a lot of answers on the internet, but nothing of all this doesn't work.
So, I do not know how to fix this error.

Answer 1

Instead of bot use client like you did all the times before.
There are people who do const client = new Discord.Client(); but there are also people who name it bot or even something really weired.
If you want to learn how to make your own bot, you can use the open-source guide created by the members and creators of discord.js wich can be found here: https://discordjs.guide/

Answer 2

You have to change bot.on(...) to client.on(...)
You didn't define bot in previous code, so you can't use it. You defined your Discord client as client in the following line:
const client = new Discord.Client();
That's why you have to use client. You can't create a listenener for a non existing client.
For further details about all events of Discord.js, you can have a look at the official discord.js documentation: https://discord.js.org/#/docs/main/stable/class/Client
There you can also find all details on how to listen to events etc.