Re: [whatwg/streams] make TransformStream respect backpressure (#550)

tyoshino commented on this pull request.



> @@ -262,12 +238,32 @@ class TransformStreamSource {
 
     transformStream._readableController = c;
 
-    return this._startPromise;
+    // delay the first source.pull call until there is backpressure
+    return this._startPromise.then(() => {

Sorry. I meant `"then" you just return ...`.

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