postMessage method

void postMessage(
  1. JSAny? message, [
  2. JSObject optionsOrTransfer
])

The postMessage() method of the ServiceWorker interface sends a message to the worker. The first parameter is the data to send to the worker. The data may be any JavaScript object which can be handled by the structured clone algorithm.

The service worker can send back information to its clients by using the Client.postMessage method. The message will not be sent back to this ServiceWorker object but to the associated ServiceWorkerContainer available via navigator.serviceWorker.

Implementation

external void postMessage(
  JSAny? message, [
  JSObject optionsOrTransfer,
]);