Re: [whatwg/streams] Define WritableStreamDefaultController.signal (#1132)

@yutakahirano commented on this pull request.



> @@ -4252,6 +4268,10 @@ The following abstract operations operate on {{WritableStream}} instances at a h
  id="writable-stream-abort">WritableStreamAbort(|stream|, |reason|)</dfn> performs the following
  steps:
 
+ 1. If |stream|.[=WritableStream/[[state]]=] is "`closed`" or "`errored`", return
+    [=a promise resolved with=] undefined.
+ 1. [=Signal abort=] on
+    |stream|.[=WritableStream/[[controller]]=].[=WritableStreamDefaultController/[[signal]]=].
  1. Let |state| be |stream|.[=WritableStream/[[state]]=].
  1. If |state| is "`closed`" or "`errored`", return [=a promise resolved with=] undefined.

Done.

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