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

@codehag commented on this pull request.



> +      :: |base|, a [=/URL=]
+      :: |seen|, a [=/set=] of [=/URLs=]
+      : Output
+      :: a boolean
+
+      1. If |record| is not a [=Cyclic Module Record=], then:
+          1. Return false.
+      1. If |record|.\[[Async]] is true, then:
+          1. Return true.
+      1. [=list/For each=] string |requested| of |record|.\[[RequestedModules]]:
+          1. Let |url| be the result of [=resolve a module specifier|resolving a module specifier=] given |base| and |requested|.
+          1. If |url| is *failure*:
+              1. Return false.
+          1. If |seen| does not [=set/contain=] |url|, then:
+              1. [=set/Append=] |url| to |seen|.
+              1. If [=Is Async Module=] for |moduleMap|[|url|]'s [=script/record=], |moduleMap|, |base|, and |seen| is true, then:

I think we also want to bring the assertion back: https://github.com/Ms2ger/ServiceWorker/pull/2/commits/6290a2c783987f79eed665db40481815a0e6501c

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