Service Workers & Progressive Web Apps

What is the significance of the 'install' event in a Service Worker?

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open('app-v1').then(cache => {
      return cache.addAll([
        '/',
        '/styles/main.css',
        '/scripts/app.js',
        '/images/logo.png'
      ]);
    })
  );
});

It's only used for updating the Service Worker
It's the best place to clear old caches
It's triggered when the PWA is added to home screen
It's the ideal time to cache static assets
The 'install' event is crucial in a Service Worker's lifecycle. It's the ideal time to cache static assets (app shell) that the application needs to work offline. The event.waitUntil() ensures the Service Worker won't install until all resources are cached. This is essential for setting up the initial cache and ensuring the app can work offline after first load.

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