From 80e3decbdc09abc9b1113c233ab67b3b00abc1fc Mon Sep 17 00:00:00 2001
From: Daijiro Wachi <daijiro.wachi@gmail.com>
Date: Wed, 6 Oct 2021 18:52:16 +0900
Subject: [PATCH] net: throw error to given objectMode in connection

Fixes: https://github.com/nodejs/node/issues/40336
---
 lib/net.js                                    |  3 +++
 .../test-net-connect-options-invalid.js       | 20 +++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 test/parallel/test-net-connect-options-invalid.js

diff --git a/lib/net.js b/lib/net.js
index ded48732c2e11e..95e36cda07c089 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -194,6 +194,9 @@ function connect(...args) {
   const normalized = normalizeArgs(args);
   const options = normalized[0];
   debug('createConnection', normalized);
+  if (options.objectMode) {
+    throw new ERR_INVALID_ARG_VALUE('options.objectMode', options.objectMode, 'is not supported');
+  }
   const socket = new Socket(options);
 
   if (options.timeout) {
diff --git a/test/parallel/test-net-connect-options-invalid.js b/test/parallel/test-net-connect-options-invalid.js
new file mode 100644
index 00000000000000..e30ab86a55bc3f
--- /dev/null
+++ b/test/parallel/test-net-connect-options-invalid.js
@@ -0,0 +1,20 @@
+'use strict';
+const assert = require('assert');
+const net = require('net');
+
+{
+  const ArgValueInvalidError = {
+    code: 'ERR_INVALID_ARG_VALUE',
+    name: 'TypeError'
+  };
+
+  const option = {objectMode: true};
+
+  assert.throws(() => {
+    net.createConnection(option);
+  }, {
+    code: 'ERR_INVALID_ARG_VALUE',
+    name: 'TypeError',
+    message: /The property 'options.objectMode' is not supported. Received true/
+  });
+}