stream: delete unused code

陈刚 · MylesBorins · commit a4cc0fb1b64d · 2018-02-21T10:19:09.000-05:00
In implementation of `stream.Writable`, `writable._write()` is always called with a callback that is `_writableState.onwrite()`. And In `afterTransform()`, `ts.writechunk` and `ts.writecb` are assigned to null. So, `ts.writecb` is a true value if `ts.writechunk` isn't null. PR-URL: #18278 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com>
diff --git a/lib/_stream_transform.js b/lib/_stream_transform.js
@@ -180,7 +180,7 @@ Transform.prototype._write = function(chunk, encoding, cb) {
 Transform.prototype._read = function(n) {
   var ts = this._transformState;
 
-  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
+  if (ts.writechunk !== null && !ts.transforming) {
     ts.transforming = true;
     this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
   } else {
