Startwith in this situation gives me lots of Errors - discord.js

Question

Everytime I run the command !ping it gives me a huge error in my client.js saying that if(message.author.bot || !message.guild || message.content.toLowerCase().startWith(!)) return; <- this line is an error! Here is the rest of the code:
const { Collection, Client, MessageEmbed } = require('discord.js');
class GiveawayClient extends Client {
constructor() {
super();
this.giveaways = new Collection();
this.commands = new Collection();
this.ms = require('ms');
this.fs = require('fs');
this.path = require('path');
this.discord = require('discord.js');
}
commandHandler(path) {
this.fs.readdirSync(this.path.join(__dirname, `..`, path)).map((f) => {
let File = require(this.path.join(__dirname, `..`, path, f));
this.commands.set(File.name, File)
})
};
start(token, path) {
this.commandHandler(path);
this.login(token);
this.on('ready', () => {
console.log(`${this.user.username} is now online!`);
});
this.on('message', async(message) => {
if(message.author.bot || !message.guild || message.content.toLowerCase().startWith(`!`)) return;
const cmd = args.shift().toLowerCase();
if(this.commands.has(cmd)) this.commands.get(cmd).run(this, message, args).catch(console.error);
});
}
embed(data, message) {
return new MessageEmbed(data).setFooter(message.author.tag, message.author.displayAvatarURL({ dynamic: true}))
}
}
module.exports = GiveawayClient;

Answer 1

I think you made a small, but deadly typo in this line, the message.content.toLowerCase().startsWith("!") shouldn't be returned, but continued, after filtering in only the ones that starts with !.
if(message.author.bot || !message.guild || message.content.toLowerCase().startsWith(`!`)) return;
Also, .startWith() is not a function, .startsWith() is.
Try changing the code above to this:
if(message.author.bot || !message.guild || !message.content.toLowerCase().startsWith(`!`)) return;
This will filter out messages that doesn't start with ! rather than filter out the ones with.

Answer 2

Just change: startWith() to startsWith.
It's just a simple typo error, make sure to read the log next time ^.