To make your PWA load the cached version while offline but load the most up-to-date data when a network connection is available, you can implement a strategy called "Cache, Falling Back to Network" in your service worker. This strategy involves first checking the cache for a requested resource, and if it is not found in the cache, then fetching it from the network.
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To implement this strategy, you can use the "fetch" event in your service worker to intercept network requests and respond to them using the cache. Here's an example implementation:
``` 
self.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.match(event.request).then(function(response) {
      if (response) {
        // Found in cache, return cached response
        return response;
      } else {
        // Not found in cache, fetch from network
        return fetch(event.request).then(function(response) {
          // Add response to cache
          return caches.open('my-cache').then(function(cache) {
            cache.put(event.request, response.clone());
            return response;
          });
        });
      }
    })
  );
});
``` 
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In this implementation, the service worker first checks if the requested resource is in the cache using caches.match(). If it is found in the cache, it returns the cached response. If it is not found in the cache, it fetches the resource from the network using fetch(), and adds the response to the cache using caches.open(). The response is then returned to the requesting client.
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By default, this strategy will only use the cached version of the resource if the device is offline. However, to make it work conditionally, you can add additional logic to check if the device is online before fetching from the network. You can do this by adding a check for navigator.onLine or by listening for the "online" and "offline" events.
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