From d398b8f02be73f2846a62080ebfbd65ede0c7d50 Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Sat, 21 Sep 2019 01:29:41 +0200
Subject: stream: make _write() optional when _writev() is implemented

When implementing _writev, _write should be optional.

PR-URL: https://github.com/nodejs/node/pull/29639
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
---
 lib/_stream_writable.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lib/_stream_writable.js')

diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index 41114f41bb..c6d895ff5d 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -565,7 +565,11 @@ function clearBuffer(stream, state) {
 }
 
 Writable.prototype._write = function(chunk, encoding, cb) {
-  cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()'));
+  if (this._writev) {
+    this._writev([{ chunk, encoding }], cb);
+  } else {
+    cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()'));
+  }
 };
 
 Writable.prototype._writev = null;
-- 
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