Scrape(Indeed|Multi): Crawl Job SERPs

/* Notes:
The only required param to access job post is "jk"
https://www.indeed.com/viewjob?jk=cfd686d617e5b037

advanced search (max limit=50)

https://www.indeed.com/jobs?as_and=javascript&as_any=node+nodejs+node.js+react+angular+developer+programmer+frontend+backend+server+design+develop&as_not=manager+supervisor+.net+asp+microsoft&jt=all&fromage=any&limit=50
*/
(() => {
  var options = {
    scripts: ["https://d3js.org/d3.v6.min.js"],
    data:[]
  }
  const downloadCSV = (data, fileName) => {
    var d = document;
    var a = d.createElement('a');
    a.href = window.URL.createObjectURL(new Blob([d3.csvFormat(data)],{type:'text/csv;charset=utf-8;'}));
    a.setAttribute('download', `${fileName}.csv`);
    d.body.appendChild(a);
    a.click();
    d.body.removeChild(a);
  };
	var run = () => {
		var collection = [];
var uniq = new Set();
var limit = 200;
var next = false;
var scrapeJobs = (doc) => {
limit--;
var getTextFromClass = (el,className) => {
		var txt = el.querySelector("."+className);
		return txt ? txt.innerText.replace(/[\n\r]+/gim,"\n").replace(/[ \t]+/gim," ").trim() : " ";
}
collection = [...collection, ...[...doc.querySelectorAll(`#resultsCol [class*=SerpJobCard]:not([class*=foot])`)].reduce((c,el) => {
	var title = getTextFromClass(el,"jobtitle");
	var lowTitle = title.toLowerCase();
	var url = el.querySelector(`a[class*=jobtitle]`).href;
		
	var company = getTextFromClass(el,"company");
	var companyRating = getTextFromClass(el,"ratingsContent"); 
  		companyRating = companyRating.length ? +companyRating : -1;
	try{
		var m = getTextFromClass(el,"date").match(/[\d]+/gim);
		if(m){
			var ageDays = +m[0];
    }
		
	}catch(e){
		var ageDays = 30;
		console.log(e)}

var fetchNext = async (url) => {
		var res = await fetch(url, {
   	  "credentials": "omit",
    	"headers": {},
    	"referrer": "https://www.indeed.com/",
   	  "method": "GET",
    	"mode": "cors"
		});
var txt = await res.text();
var parser = await new DOMParser();
 var doc = await parser.parseFromString(txt, "text/html");
 scrapeJobs(doc);

}
scrapeJobs(document)
   
  }
  const loadScripts = ({scripts}) => {
    console.log(`Loading External Scripts`);
    var scriptCountdown = scripts.length;
    var loadScript = (url) => {
      var scriptsLoaded = () => scriptCountdown == 0 ? run() : null;
      var imported = document.createElement('script');
      imported.src = url;
      imported.addEventListener("load", () => {
        scriptCountdown--;
        scriptsLoaded();
      });
      document.head.appendChild(imported);
    }
    scripts.forEach(loadScript)
  }
  loadScripts(options);
})();