Customize output name of service worker

Describe the problem

I'm trying to migrate my old React project to SvelteKit.

In my old project, I have registered a service worker in /sw.js, but in SvelteKit, the service worker is located in /service-worker.js and cannot be changed.

https://github.com/sveltejs/kit/blob/main/packages/kit/src/runtime/server/page/render.js#L401-L405

// #L401-L405
blocks.push(`if ('serviceWorker' in navigator) {
  addEventListener('load', function () {
    navigator.serviceWorker.register('${prefixed('service-worker.js')}'${opts});
    //                                            ^ hard-coded here
  });
}`);

As a workaround, I have to add a pre-build step to build sw.js isolatedly, then copy it into /static folder, but I feel it's not a good solution.

Describe the proposed solution

It would be great if we can customize the location in svelte.config.js likes this:

// svelte.config.js
const config = {
  kit: {
    serviceWorker: {
      register: true,
      // `scriptURL` comes from
      // https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register#syntax
      scriptURL: '/sw.js',
    },
  },
}
export default config

Alternatives considered

No response

Importance

nice to have

Additional Information

No response

Start with packages/kit/src/runtime/server/page/render.js around lines 401-405, where the service-worker.js registration URL is hard-coded. Then trace how options from svelte.config.js reach this rendering code. Done means a configured scriptURL such as /sw.js is used for service-worker registration instead of the fixed path.