From 3acfe9bf926a480537cad35abc11a36e2262075b Mon Sep 17 00:00:00 2001
From: Erick Wendel <erick.workspace@gmail.com>
Date: Fri, 20 Jan 2023 09:37:52 -0300
Subject: [PATCH] stream: fix readable stream as async iterator function

Since v19.2 it's not possible to use readableStreams
as async iterators (confirmed bug).
This patch fixes the problem by reading the Stream.Duplex property
from 'streams/duplex' instead of 'streams/legacy' module

Fixes: https://github.com/nodejs/node/issues/46141
PR-URL: https://github.com/nodejs/node/pull/46147
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
---
 lib/stream/promises.js                        |  2 ++
 .../test-stream3-pipeline-async-iterator.js   | 27 +++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 test/parallel/test-stream3-pipeline-async-iterator.js

diff --git a/lib/stream/promises.js b/lib/stream/promises.js
index 7a896f87b14392..512012860f4a7a 100644
--- a/lib/stream/promises.js
+++ b/lib/stream/promises.js
@@ -13,6 +13,8 @@ const {
 const { pipelineImpl: pl } = require('internal/streams/pipeline');
 const { finished } = require('internal/streams/end-of-stream');
 
+require('stream');
+
 function pipeline(...streams) {
   return new Promise((resolve, reject) => {
     let signal;
diff --git a/test/parallel/test-stream3-pipeline-async-iterator.js b/test/parallel/test-stream3-pipeline-async-iterator.js
new file mode 100644
index 00000000000000..ad1e4647777bcd
--- /dev/null
+++ b/test/parallel/test-stream3-pipeline-async-iterator.js
@@ -0,0 +1,27 @@
+/* eslint-disable node-core/require-common-first, require-yield */
+'use strict';
+const { pipeline } = require('node:stream/promises');
+{
+  // Ensure that async iterators can act as readable and writable streams
+  async function* myCustomReadable() {
+    yield 'Hello';
+    yield 'World';
+  }
+
+  const messages = [];
+  async function* myCustomWritable(stream) {
+    for await (const chunk of stream) {
+      messages.push(chunk);
+    }
+  }
+
+  (async () => {
+    await pipeline(
+      myCustomReadable,
+      myCustomWritable,
+    );
+    // Importing here to avoid initializing streams
+    require('assert').deepStrictEqual(messages, ['Hello', 'World']);
+  })()
+  .then(require('../common').mustCall());
+}