How to prevent the same service worker from registering over multiple pages?

Question

I have a service worker script that is registering repeatedly over multiple site levels.

In other words the same service worker is registered for www.site.ca/, www.s

Answer 1

According to MDN, ServiceWorkerContainer.register method takes a second parameter of options:

Currently available options are:

• scope: A USVString representing a URL that defines a service worker's registration scope; what range of URLs a service worker can control. This is usually a relative URL, and it defaults to '/' when not specified.

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As for your updated question, the W3C Service Workers WD says:

A service worker registration of an identical scope url when one already exists in the user agent causes the existing service worker registration to be replaced.

Therefore navigator.serviceWorker.register(url, {scope: '/'}).then(doSomething) should work.

Problem is with the scope URL in your example:

./ should be /