From 5b2004ac7a977c1c40994d198fe75aa3e69190ad Mon Sep 17 00:00:00 2001
From: Taeuk Ha <tomcat0519@naver.com>
Date: Mon, 10 Aug 2026 17:41:21 +0900
Subject: [PATCH] stream: use validateNumber for options.min

Signed-off-by: Taeuk Ha <tomcat0519@naver.com>
---
 lib/internal/webstreams/readablestream.js     |  4 +--
 ...eadablebytestream-bad-buffers-and-views.js | 34 +++++++++++++++++++
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/lib/internal/webstreams/readablestream.js b/lib/internal/webstreams/readablestream.js
index e1e80eb953c0..81554033a302 100644
--- a/lib/internal/webstreams/readablestream.js
+++ b/lib/internal/webstreams/readablestream.js
@@ -62,6 +62,7 @@ const {
 const {
   validateAbortSignal,
   validateBuffer,
+  validateNumber,
   validateObject,
   kValidateObjectAllowObjects,
   kValidateObjectAllowObjectsAndNull,
@@ -1095,8 +1096,7 @@ class ReadableStreamBYOBReader {
     // detached, but there's no API available to use to check that.
 
     const min = options?.min ?? 1;
-    if (typeof min !== 'number')
-      throw new ERR_INVALID_ARG_TYPE('options.min', 'number', min);
+    validateNumber(min, 'options.min');
     if (!NumberIsInteger(min))
       throw new ERR_INVALID_ARG_VALUE('options.min', min, 'must be an integer');
     if (min <= 0)
diff --git a/test/parallel/test-whatwg-readablebytestream-bad-buffers-and-views.js b/test/parallel/test-whatwg-readablebytestream-bad-buffers-and-views.js
index a8f6ffc7535e..d69e5d2d683e 100644
--- a/test/parallel/test-whatwg-readablebytestream-bad-buffers-and-views.js
+++ b/test/parallel/test-whatwg-readablebytestream-bad-buffers-and-views.js
@@ -85,4 +85,38 @@ let pass = 0;
     .then(common.mustCall());
 }
 
+{
+  // options.min must be a number.
+  const stream = new ReadableStream({
+    start(c) {
+      c.enqueue(new Uint8Array([1, 2, 3]));
+    },
+    type: 'bytes',
+  });
+  const reader = stream.getReader({ mode: 'byob' });
+
+  assert
+    .rejects(reader.read(new Uint8Array(3), { min: 'not a number' }), {
+      code: 'ERR_INVALID_ARG_TYPE',
+      name: 'TypeError',
+    })
+    .then(common.mustCall());
+}
+
+{
+  // A valid numeric options.min still works as expected.
+  const stream = new ReadableStream({
+    start(c) {
+      c.enqueue(new Uint8Array([1, 2, 3]));
+    },
+    type: 'bytes',
+  });
+  const reader = stream.getReader({ mode: 'byob' });
+
+  reader.read(new Uint8Array(3), { min: 1 }).then(common.mustCall(({ value, done }) => {
+    assert.strictEqual(done, false);
+    assert.deepStrictEqual([...value], [1, 2, 3]);
+  }));
+}
+
 process.on('exit', () => assert.strictEqual(pass, 2));