Re: [whatwg/streams] Add examples of using identity transforms to manipulate streams (#847)

ricea commented on this pull request.



> @@ -4572,6 +4572,55 @@ and similarly, closing or aborting the <code>writable</code> side will implicitl
 
 </div>
 
+<h3 id="example-ts-promise-to-readable">Using an identity transform stream as a primitive when manipulating streams</h3>
+
+Combining an identity transform stream with {{pipeTo()}} is a powerful way to manipulate streams. For example,
+concatenating multiple readable streams into one:
+
+<pre><code class="lang-javascript">
+function concatenateReadables(readables) {

Using "async function" makes it return a promise. We could of course wrap it in a call to promiseToReadable(), but that would be poor for ergonomics.

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