[pkg] Remove native-duplexpair dev dependency

It seems to be no longer maintained.

package.json

@@ -58,7 +58,6 @@
     "eslint-config-prettier": "^9.0.0",
     "eslint-plugin-prettier": "^5.0.0",
     "mocha": "^8.4.0",
-    "native-duplexpair": "^1.0.0",
     "nyc": "^15.0.0",
     "prettier": "^3.0.0",
     "utf-8-validate": "^6.0.0"

test/duplex-pair.js

@@ -0,0 +1,73 @@
+//
+// This code was copied from
+// https://github.com/nodejs/node/blob/c506660f3267/test/common/duplexpair.js
+//
+// Copyright Node.js contributors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+'use strict';
+
+const assert = require('assert');
+const { Duplex } = require('stream');
+
+const kCallback = Symbol('Callback');
+const kOtherSide = Symbol('Other');
+
+class DuplexSocket extends Duplex {
+  constructor() {
+    super();
+    this[kCallback] = null;
+    this[kOtherSide] = null;
+  }
+
+  _read() {
+    const callback = this[kCallback];
+    if (callback) {
+      this[kCallback] = null;
+      callback();
+    }
+  }
+
+  _write(chunk, encoding, callback) {
+    assert.notStrictEqual(this[kOtherSide], null);
+    assert.strictEqual(this[kOtherSide][kCallback], null);
+    if (chunk.length === 0) {
+      process.nextTick(callback);
+    } else {
+      this[kOtherSide].push(chunk);
+      this[kOtherSide][kCallback] = callback;
+    }
+  }
+
+  _final(callback) {
+    this[kOtherSide].on('end', callback);
+    this[kOtherSide].push(null);
+  }
+}
+
+function makeDuplexPair() {
+  const clientSide = new DuplexSocket();
+  const serverSide = new DuplexSocket();
+  clientSide[kOtherSide] = serverSide;
+  serverSide[kOtherSide] = clientSide;
+  return { clientSide, serverSide };
+}
+
+module.exports = makeDuplexPair;

test/websocket-server.test.js

@@ -10,8 +10,8 @@ const path = require('path');
 const net = require('net');
 const fs = require('fs');
 const os = require('os');
-const DuplexPair = require('native-duplexpair');
 
+const makeDuplexPair = require('./duplex-pair');
 const Sender = require('../lib/sender');
 const WebSocket = require('..');
 const { NOOP } = require('../lib/constants');
@@ -526,15 +526,15 @@ describe('WebSocketServer', () => {
           //
           // Put a stream between the raw socket and our websocket processing.
           //
-          const { socket1: stream1, socket2: stream2 } = new DuplexPair();
+          const { clientSide, serverSide } = makeDuplexPair();
 
-          socket.pipe(stream1);
-          stream1.pipe(socket);
+          socket.pipe(clientSide);
+          clientSide.pipe(socket);
 
           //
           // Pass the other side of the stream as the socket to upgrade.
           //
-          wss.handleUpgrade(req, stream2, head, (ws) => {
+          wss.handleUpgrade(req, serverSide, head, (ws) => {
             ws.send('hello');
             ws.close();
           });