Easy service worker

Easiest caching ever

No need to hard work as ETag or whatever. As easy as drinking a coffee, even easier.

1. Caches only html. Images and other assets are the concern of browsers

2. Initially, returns the cached version of the url.

3. After that, makes a fetch request on background to that url.

4. If our algorithm finds any difference between the cached and the remote html, then it updates the cache on background and sends a message to the client

5. When the client gets the message to refresh, it can reload the page or load it via js (example: jQuery load function)

See the example folder for testing it yourself

Usage

Service worker file

importScripts('https://cdn.jsdelivr.net/gh/nagibaba/easy-service-worker@1.2.3/lib/index.js');

const sw = new EasySW();

sw.CACHENAME = 'default-easy-cache-v1'

// resources to be precached
// @default ['/']
sw.precacheResources = ['/'];

// Cache requests including "?"
// @default false
sw.cacheGetRequests = false;

// offline if not cached
// @default '/offline'
sw.offlinePage = '/offline';


// Returns true if you don't want the URL to be cached
// @return boolean
// @param {url} requested url
// @default false
sw.exclude = (url) => {
  return false;
}

Html part (Client)

<script>
  if ('serviceWorker' in navigator) {
        window.addEventListener('load', () => {
            navigator.serviceWorker.register("/sw.js")
            .then((reg) => {
              console.log('Service worker registered.', reg);
            });
        });


        navigator.serviceWorker.onmessage = function (evt) {
            const message = JSON.parse(evt.data);
            const isRefresh = message.type === 'refresh';
            const isUncachableResponse = message.type === 'uncachable-response';

            if(isRefresh){
              location.reload();
            }

            if(isUncachableResponse){
              // response code is 300 or more
            }
          }

    }
</script>

| WARNING: Any regenerated strings like csrf tokens may end up with forever reloading. If so, avoid any reload function call or wrap regenerated texts inside <!--EasySWIgnore--> <!--/EasySWIgnore-->|

Example

See the example folder for testing it yourself

npm run serve

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

npm run prepublish

Version 1.2.3

License

MIT