node error. I have 2 js files and on console I typed “node index.js functions.js” . Please note: im trying to use firebase

please check the error below:
node:internal/process/esm_loader:40
internalBinding(‘errors’).triggerUncaughtException(
^

Error [ERR_MODULE_NOT_FOUND]: Cannot find module ‘D:web devscrimbamobile appfunctions’ imported from D:web devscrimbamobile appindex.js
Did you mean to import ../functions.js?

Given below is the code I’m trying to run: (Index.html, index.js, functions.js)

    <!doctype html>
<html>
    <head>
        <title>Reel Time</title>
        <link rel="preconnect" href="https://fonts.googleapis.com">
        <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
        <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300&family=Ultra&display=swap" rel="stylesheet">
        <link rel="stylesheet" href="index.css">
    </head>
    <body>
        <div class="container">
            <h1>Reel Time</h1>
            <div class="field">
                <input type="text" id="input-field" placeholder="Pulp Fiction">
                <button id="add-button">+</button>
            </div>
        </div>
        <script src="index.js" type="module"></script>
        <script src="functions.js" type="module"></script>
    </body>
</html>

//const readlineSync = require (readlineSync)


import { add } from "./functions"
console.log(add(20,30))

const appSettings = {
    databaseURL: "https://playground-91206-default-rtdb.asia-southeast1.firebasedatabase.app/"

}
const inputFieldEl = document.getElementById("input-field")
const addButtonEl = document.getElementById("add-button")

addButtonEl.addEventListener("click", function() {
    let inputValue = inputFieldEl.value
    
    console.log(`${inputValue} added to database`)
})

 //const readlineSync = require (readlineSync)

export function add(a,b) {
       return a + b
}