stream: support Uint8Array input to methods

PR-URL: https://github.com/nodejs/node/pull/11608
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index 768d80a96e..615f5a3762 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -248,7 +248,11 @@ function validChunk(stream, state, chunk, cb) {
 Writable.prototype.write = function(chunk, encoding, cb) {
   var state = this._writableState;
   var ret = false;
-  var isBuf = (chunk instanceof Buffer);
+  var isBuf = Stream._isUint8Array(chunk) && !state.objectMode;
+
+  if (isBuf && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
+    chunk = Stream._uint8ArrayToBuffer(chunk);
+  }
 
   if (typeof encoding === 'function') {
     cb = encoding;