I'm going to do some pages using puppeteer, but I can't get the results asynchronously.

const puppeteer = require('puppeteer');

const array = ["a","b","c","d","e"];
const chunkSize = 2;

for(var i=0;i<array.length;i+=chunkSize){
const chunk = array.slice(i, i + chunkSize);
console.log('chunk=',chunk);
  for(var a=0;a<chunk.length;a++){
    (async () => {
      const browser = await puppeteer.launch({headless:false})
      const page = await browser.newPage();
      console.log(chunk[a]);
    })()
  }
}

result ; d b d undefined b

my expectation : a b c d e