1  console.log("Hello, this message is sent by a service worker");
 2  
 3  // This code executes in its own worker or thread
 4  self.addEventListener("install", (event) => {
 5    console.log("Service worker installed");
 6  });
 7  self.addEventListener("activate", (event) => {
 8    console.log("Service worker activated");
 9  });
10  
11  self.addEventListener("fetch", (event) => {
12    // Handle fetch events
13    console.log("Fetch event detected");
14  });