ServiceWorkerGlobalScope: registration property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
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 registration read-only property of the ServiceWorkerGlobalScope interface returns a reference to the ServiceWorkerRegistration object, which represents the service worker's registration.