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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/error_event below:

ServiceWorker: error event - Web APIs

ServiceWorker: error event

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

Note: This feature is available in Web Workers.

The error event fires whenever an error occurs in the service worker.

Syntax

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

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

onerror = (event) => { }
Event type

A generic Event.

Example

The following code snippet gets a handle to the ServiceWorker object via ServiceWorkerRegistration.active and sets up an onerror handler on the resulting object:

// in the page being controlled
if (navigator.serviceWorker) {
  navigator.serviceWorker.register("service-worker.js");

  navigator.serviceWorker.ready.then((registration) => {
    registration.active.onerror = (event) => {
      console.log("An error occurred in the service worker!");
    };
  });
}
Specifications Browser compatibility

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