Re: [w3c/ServiceWorker] Feature detection for type="module" support (#1582)

A workaround for now:

```js
let readType = false;
navigator.serviceWorker
  .register('about:blank', {
    get type() {
      readType = true;
    },
  })
  .catch(() => {});
```

If `readType` is false, it doesn't understand `type`.

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