stream: remove no longer necessary ComposeDuplex

PR-URL: #40545
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Author: ronag

lib/internal/streams/compose.js

@@ -16,28 +16,6 @@ const {
   },
 } = require('internal/errors');
 
-// This is needed for pre node 17.
-class ComposeDuplex extends Duplex {
-  constructor(options) {
-    super(options);
-
-    // https://github.com/nodejs/node/pull/34385
-
-    if (options?.readable === false) {
-      this._readableState.readable = false;
-      this._readableState.ended = true;
-      this._readableState.endEmitted = true;
-    }
-
-    if (options?.writable === false) {
-      this._writableState.writable = false;
-      this._writableState.ending = true;
-      this._writableState.ended = true;
-      this._writableState.finished = true;
-    }
-  }
-}
-
 module.exports = function compose(...streams) {
   if (streams.length === 0) {
     throw new ERR_MISSING_ARGS('streams');
@@ -107,7 +85,7 @@ module.exports = function compose(...streams) {
   // TODO(ronag): Avoid double buffering.
   // Implement Writable/Readable/Duplex traits.
   // See, https://github.com/nodejs/node/pull/33515.
-  d = new ComposeDuplex({
+  d = new Duplex({
     // TODO (ronag): highWaterMark?
     writableObjectMode: !!head?.writableObjectMode,
     readableObjectMode: !!tail?.writableObjectMode,