puppeteer_coverage.js

(async () => {
  const pti = require('puppeteer-to-istanbul')
  const puppeteer = require('puppeteer')
  const browser = await puppeteer.launch()
  const page = await browser.newPage()

  // Enable both JavaScript and CSS coverage
  await Promise.all([
    page.coverage.startJSCoverage(),
    page.coverage.startCSSCoverage(),
  ])
  // Navigate to page
  await page.goto('http://example.com')
  // Disable both JavaScript and CSS coverage
  const [jsCoverage, cssCoverage] = await Promise.all([
    page.coverage.stopJSCoverage(),
    page.coverage.stopCSSCoverage(),
  ])
  pti.write([...jsCoverage, ...cssCoverage])
  await browser.close()
})()

/*
node index.js
nyc report --reporter=html
open coverage/index.html
 */