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// in page.htmlnavigator.serviceWorker.controller.postMessage({'hello':'world'});
// in sw.jsself.addEventListener('message',event=>{console.log(event.data);// outputs {'hello':'world'}});
ServiceWorker broadcast to all connected Pages
// in sw.jsthis.clients.matchAll().then(clients=>{clients.forEach(client=>{client.postMessage('Broadcast to all clients !');)}});
// in page.htmlwindow.addEventListener('message',event=>{console.log(event)},false);
Private communication
// in page.htmlconstmessageChannel=newMessageChannel();// Listen for messages from service workermessageChannel.port1.onmessage=(event)=>{console.log('main thread received a new message',event.data);}// Send message to service workernavigator.serviceWorker.controller.postMessage({message: 'something'},[messageChannel.port2]);
// in sw.js// Listen for messages from service workerthis.addEventListener('message',event=>{console.log('worker received a new message:',event.data)// Reply to messageevent.ports[0].postMessage('private msg back');});