discord.js – How to use startsWith in node.js?

    let botmod = staff.get(`${message.author.id}`)
     if (botmod.startsWith !== "Bot") {
    message.channel.send("Unfortunately, you are a server mod. You can't use bot commands.")

The above is an example of me trying to use a startsWith. However I don’t think I am using it correctly.
It triggers that message even if, the message does have Bot in it. There are no errors in console.