[w3c/ServiceWorker] Is there a way to know if a <script>'s fetch request has an integrity attribute? (#1507)

Imagine a service worker that intercepts JS requests, passes it to a JS optimization service, then returns the optimized response (Disregard the fact that this would be really slow). If the script tag that spawned this request has the `integrity` attribute, the response would be rejected, right? Because the hash of the optimized js would differ from the original JS.

The `integrity` property in the fetch event always seems to be an empty string. Is there a way to know if a <script>'s fetch request has an integrity attribute?

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