worker-waituntil.js

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event, event.request))
})

/**
 * Fetch and log a given request object
 * @param {Request} request
 */
async function handleRequest(event, request) {
  console.log('Got request', request)
  const response = await fetch(request)
  console.log('Got response', response)
  event.waitUntil(
    new Promise((resolve) => {
      setTimeout(() => {
        console.log('test')
        resolve()
      }, 10000)
    })
  )
  return response
}