Puppeteer Unused Code Application in Shopify

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I want to develop an app in Shopify. I haven't enough experience with React and Next.js but I still have to code this application.

I completed the training in this link and it works properly.


But what I want to do is different than the sample application. By using Google Puppeteer in the Shopify application, I want to take unused css codes on the Shopify site where the application is installed and create a visual structure that the user can download.

This is the code that adds unused css files on the specified site to the file containing the code:

const puppeteer = require('puppeteer');
const util = require('util');
const fs    = require("fs");

(async () => {
 const browser = await puppeteer.launch();
 const page = await browser.newPage();
 await page.coverage.startCSSCoverage();
 await page.goto('https://kolayoto.com/'); // Change this
 const css_coverage = await page.coverage.stopCSSCoverage();
 console.log(util.inspect(css_coverage, { showHidden: false, depth: null }));
 await browser.close();

let final_css_bytes = '';
let total_bytes = 0;
let used_bytes = 0;

for (const entry of css_coverage) {
  final_css_bytes = "";

  total_bytes += entry.text.length;
  for (const range of entry.ranges) {
    used_bytes += range.end - range.start - 1;
    final_css_bytes += entry.text.slice(range.start, range.end) + '\n';

  filename = entry.url.split('/').pop();

  fs.writeFile('./'+filename, final_css_bytes, error => {
    if (error) {
      console.log('Error creating file:', error);
    } else {
      console.log('File saved');

Since this code is a JavaScript code, I don't know how to code it with React.js and Next.js, and how to design an interface with Apollo and Polaris. As I am inexperienced in these matters, I ask you to guide me.

I am waiting for your support, thank you very much in advance.