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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/push_event below:

ServiceWorkerGlobalScope: push event - Web APIs

Baseline 2023

Newly available

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is only available in Service Workers.

The push event is sent to a service worker's global scope (represented by the ServiceWorkerGlobalScope interface) when the service worker has received a push message.

This event is not cancelable and does not bubble.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("push", (event) => { })

onpush = (event) => { }

Inherits properties from its parent, ExtendableEvent. Additional properties:

PushEvent.data Read only

Returns a reference to a PushMessageData object containing data sent to the PushSubscription.

This example sets up a handler for push events that takes JSON data, parses it, and dispatches the message for handling based on information contained within the message.

self.addEventListener(
  "push",
  (event) => {
    let message = event.data.json();

    switch (message.type) {
      case "init":
        doInit();
        break;
      case "shutdown":
        doShutdown();
        break;
    }
  },
  false,
);

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