Service Workers & Progressive Web Apps

What is the purpose of clients.claim() in a Service Worker?

self.addEventListener('activate', event => {
  event.waitUntil(
    Promise.all([
      clients.claim(),
      // Clean up old caches
      caches.keys().then(cacheNames => {
        // Cache cleanup logic
      })
    ])
  );
});

To claim storage space for caching
To take control of uncontrolled clients immediately
clients.claim() allows a Service Worker to take immediate control of all active clients (pages) within its scope, rather than waiting until the next page load. This is useful when: 1) You want the Service Worker to begin controlling pages immediately after activation, 2) You need to ensure consistent behavior across all open tabs, 3) You're implementing immediate cache updates or offline functionality.
To verify client authentication
To register the Service Worker

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