deps: upgrade npm to 6.1.0

PR-URL: https://github.com/nodejs/node/pull/20190
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

1 files changed, 21 insertions, 14 deletions

diff --git a/deps/npm/node_modules/readable-stream/lib/_stream_duplex.js b/deps/npm/node_modules/readable-stream/lib/_stream_duplex.js
index c599463dd8..a1ca813e5a 100644
--- a/deps/npm/node_modules/readable-stream/lib/_stream_duplex.js
+++ b/deps/npm/node_modules/readable-stream/lib/_stream_duplex.js
@@ -28,7 +28,7 @@
 
 /*<replacement>*/
 
-var processNextTick = require('process-nextick-args');
+var pna = require('process-nextick-args');
 /*</replacement>*/
 
 /*<replacement>*/
@@ -52,10 +52,13 @@ var Writable = require('./_stream_writable');
 
 util.inherits(Duplex, Readable);
 
-var keys = objectKeys(Writable.prototype);
-for (var v = 0; v < keys.length; v++) {
-  var method = keys[v];
-  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
+{
+  // avoid scope creep, the keys array can then be collected
+  var keys = objectKeys(Writable.prototype);
+  for (var v = 0; v < keys.length; v++) {
+    var method = keys[v];
+    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
+  }
 }
 
 function Duplex(options) {
@@ -74,6 +77,16 @@ function Duplex(options) {
   this.once('end', onend);
 }
 
+Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', {
+  // making it explicit this property is not enumerable
+  // because otherwise some prototype manipulation in
+  // userland will fail
+  enumerable: false,
+  get: function () {
+    return this._writableState.highWaterMark;
+  }
+});
+
 // the no-half-open enforcer
 function onend() {
   // if we allow half-open state, or if the writable side ended,
@@ -82,7 +95,7 @@ function onend() {
 
   // no more data can be written.
   // But allow more writes to happen in this tick.
-  processNextTick(onEndNT, this);
+  pna.nextTick(onEndNT, this);
 }
 
 function onEndNT(self) {
@@ -114,11 +127,5 @@ Duplex.prototype._destroy = function (err, cb) {
   this.push(null);
   this.end();
 
-  processNextTick(cb, err);
-};
-
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
\ No newline at end of file
+  pna.nextTick(cb, err);
+};
\ No newline at end of file