Clients.get()

The get() method of the Clients interface gets a service worker client matching a given id and returns it in a Promise.

self.clients.get(id).then(function(client) {
  // do something with your returned client
});

id

A DOMString representing the id of the client you want to get.

A Promise that resolves to a Client object or undefined.

self.clients.get(id).then(function(client) {
  self.clients.openWindow(client.url);
});