Why is this not a function? Importing ./src/index.js in ./index.js works just fine, but trying to import it in ./src/Client.js just doesn't let me. It's not some "invalid file path" because I don't have any errors, and it autofilled in the require function.

Here is my code:

./index.js

const index = require("./src/index.js")
console.log(index) //logs the module

./src/Client.js

const index = require("./index.js") //I even tried require("../src/index.js") and the full path (D:/...)
console.log(index) //logs empty object

index.bindClient(client) //TypeError: index.bindClient is not a function

./src/index.js

module.exports = {
    Send,
    MessageDelete,
    Command,
    Client: C,
/**
 * 
 * @param {Client} client
 */
    bindClient(client) {
        c = client;
        return (
            c.on("messageCreate", msg => {
            const command = commands.find(c => msg.content.startsWith(c.name))
            if (command) {
                command.send ? Send(command.send, msg.channel) : null
                command.delete ? MessageDelete(msg) : null
                command.emit("execute", msg, command)
            }
        })
        );
    }
}

This is not my full code, I only included the important parts that relate to the error. I tried logging as much as I could and everything except for index in ./src/Client.js was what it was supposed to be. This error even happened when I tried to set it like module.exports.bindClient = ...