Re: [w3c/ServiceWorker] Handle asynchronous modules (top-level await). (#1444)

> I was also thinking of this as a way to allow top-level await, but only for a limited number of ticks

What would we do if it exceeded that number of ticks?

> This whole setup still seems rather suboptimal for the design of service workers.

Yeah, it still feels like we'd have to tell developers "you can do this but oh god please don't do this".

Looking at the PR, we could fail the install of a service worker if its `|evaluationPromise|.\[[PromiseState]]` is "pending". This would effectively prevent top-level `await` in service workers at install time. A top-level await could be introduced later, using something like `if (Date.now() > …)`, in which case we'd behave as above.

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