Re: [w3c/ServiceWorker] Top-level await integration for ServiceWorkers running modules (#1407)

Oh, I missed that you were talking about shifting this to when the TLA is hit. I worry that that would be less predictable and regular than rejecting all async modules. If we want to prevent top-level await in modules, I'd prefer we reject the module graph ahead of time, rather than when the await expression runs. In general, the semantics of TLA have been careful to generally treat modules which have a TLA which is not dynamically hit as "async modules", taking e.g., an extra microtask turn.

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