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How to use this script for a website with many urls ?

Using Promises, we can run as many as urls we want. In app.js, replace the code with the below snippet:

(async function () {
 const extractCriticalCss = require('./extractCriticalCss');
 await Promise.all([
   extractCriticalCss('https://www.google.com'),
   extractCriticalCss('https://www.abc.com'),
   extractCriticalCss('https://www.bcd.com'),
   extractCriticalCss('https://www.cfgd.com'),
   extractCriticalCss('https://www.cndchd.com')
 ]).then((res) => {
   console.log('Critical Css for the pages has been extracted successfully !', res);
 }).catch((err) => {
   if (err) console.log('An error occured while trying to extract critical css !', err);
 });
})();