surma

// Implements stale-while-revalidate
self.addEventListener('fetch', event => {
  const cached = caches.match(event.request);
  const fetched = fetch(event.request);
  const fetchedCopy = fetched.then(resp => resp.clone());

  // Call respondWith() with whatever we get first.
  // If the fetch fails (e.g disconnected), wait for the cache.
  // If there’s nothing in cache, wait for the fetch. 
  // If neither yields a response, return a 404.

jsdf

var util = require('util');

// nobody cares about warnings so lets make them errors

// keep a reference to the original console methods
var consoleWarn = console.warn;
var consoleError = console.error;

function logToError() {
  throw new Error(util.format.apply(this, arguments).replace(/^Error: (?:Warning: )?/, ''));

dperini

//
// Regular Expression for URL validation
//
// Author: Diego Perini
// Created: 2010/12/05
// Updated: 2018/09/12
// License: MIT
//
// Copyright (c) 2010-2018 Diego Perini (http://www.iport.it)
//