Re: [whatwg/streams] Support transferable streams (postMessage) (#1053)

@ricea commented on this pull request.



> + 1. Let |result| be [$PackAndPostMessage$](|port|, |type|, |value|).
+ 1. If |result| is an abrupt completion,
+  1. Perform ! [$CrossRealmTransformSendError$](|port|, |result|.\[[Value]]).
+  1. Return [=a promise rejected with=] |result|.\[[Value]].
+ 1. Otherwise, return [=a promise resolved with=] undefined.
+
+</div>
+
+<div algorithm>
+ <dfn abstract-op lt="CrossRealmTransformSendError">CrossRealmTransformSendError(|port|,
+ |error|)</dfn> performs the following steps:
+
+ 1. Perform [$PackAndPostMessage$](|port|, `"error"`, |error|), discarding the result.
+
+ <p class="note">As we are already in an errored state when this abstract operation is performed, we
+ cannot handle further errors, so we just discard them.</p>

`PackAndPostMessage()` doesn't create a promise.

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