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Use Angular’s SwUpdate service to communicate with the service worker about application updates, and use SwPush for Web Push messages and notification actions. For most update flows, listen for a ready version, ask the user before refreshing, and reload the page to activate it.
Choose the Angular service for the task
| Need | Angular API | What it provides |
|---|---|---|
| Detect and manage application versions | SwUpdate |
Version events, manual update checks, activation, and notification of unrecoverable client state. |
| Receive Web Push messages and notification actions | SwPush |
Push payloads, notification click and close events, and subscription management. |
These are separate communication paths: an application update is not a push message. Angular’s service-worker documentation describes its worker as a basic caching utility for simple offline support; for advanced caching and offline behavior, Angular recommends exploring native browser APIs. Angular’s service-worker overview
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Listen for application update events
Subscribe to SwUpdate.versionUpdates, an observable that emits events describing the update lifecycle. Branch on the event’s type so the application can respond to the event that actually occurred.
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A typical flow is to show an update prompt on VERSION_READY, then reload only after the user agrees. Installation failures can be logged or sent to monitoring. See Angular’s service-worker communications guide and SwUpdate API reference for event details.
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Check for an update manually
Call checkForUpdate() when the application needs an explicit check, such as at a chosen point in its own update flow. The method returns a promise: it resolves to true when an update is found and ready, resolves to false when no update is found, and rejects if the check fails.
Manual checks are not required just to discover updates: Angular checks during initialization and on navigation. For an application that needs scheduled checks, wait until Angular reports that the application is stable before starting a timer. Angular’s guide illustrates this with a six-hour RxJS interval; that interval is an example, not a universal cadence. Constant polling before stabilization can delay service-worker registration.
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Prompt before reloading to activate a ready version
When VERSION_READY arrives, the usual choice is to tell the user an update is available and offer a refresh. Reloading lets the new application shell and its resources load together, and the user can choose a less disruptive moment rather than losing unsaved work.
activateUpdate() can activate a version in the current tab without reloading, but Angular warns that this can leave a new application shell trying to use resources from an older version. For example, a changed lazy-loaded chunk may not match the version the shell expects, breaking the application. Use no-reload activation only if the application’s version compatibility has been checked. Angular’s SwUpdate API reference says that, in most cases, clients should be updated by reloading instead.
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Handle an unrecoverable client
Subscribe to SwUpdate.unrecoverable and provide a clear recovery action, normally a full-page reload. This event indicates that the current client cannot be repaired through the usual update flow.
One documented cause is an older application shell requesting a cached lazy-loaded chunk that the browser has evicted, while the server now retains only a new hash-named chunk. The old client cannot retrieve the exact asset it expects, so it needs to load the application again. Angular’s communications guide
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Check service-worker support and registration
Service workers require a secure context: use HTTPS in deployed environments; Angular identifies localhost as the development exception. Browsers without service-worker support do not get Angular’s service-worker cache management or push behavior. Check SwUpdate.isEnabled before calling methods such as checkForUpdate(): unsupported environments can reject active calls, and related observables may not emit.
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By default, Angular waits up to 30 seconds for the application to stabilize before registering the worker. A polling task that keeps the app unstable can therefore delay registration until that maximum. Start polling after ApplicationRef.isStable becomes true, or choose a registration strategy suited to the application.
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For standalone configuration, Angular provides provideServiceWorker(). Its registration options include enabled, updateViaCache, type, scope, and registrationStrategy; enabled determines whether registration and related service interactions are attempted. See the getting-started guide and SwRegistrationOptions API for configuration details.
Use SwPush for Web Push
For push-specific work, SwPush exposes the messages, notificationClicks, and notificationCloses observables, along with subscription-related APIs including pushSubscriptionChanges, subscription, and isEnabled. A push subscription request requires a server public key and browser support, and depends on user permission. The request rejects if permission is denied or the browser lacks or blocks the Push API or service workers. unsubscribe() removes an active subscription. See Angular’s SwPush API reference.
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