Minimal service worker for use when developing a PWA

script.js

// Copy and paste this code into your main script file
// The purpose is to register the service worker
// The browser will load sw.js for us if you do this

if ('serviceWorker' in navigator) {
	// Assumes your service worker has file name "sw.js"
    navigator.serviceWorker.register('sw.js')
    .then(reg => {
        console.log('Registration succeeded. Scope is ' + reg.scope);
    });
}

sw.js

// The purpose of this file is to provide a minimal service worker file
// It is not complete, but it should be enough for you to get started

self.addEventListener('install', function(event) {
    console.log('Service worker: install');
    // Attempt to load cached files
});

self.addEventListener('fetch', function(event) {
    console.log('Service worker: fetch');
	// Look for cached files and handle AJAX failures due to being offline
});