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, 76 insertions, 0 deletions

diff --git a/deps/npm/node_modules/duplexer3/index.js b/deps/npm/node_modules/duplexer3/index.js
new file mode 100644
index 0000000000..1339ffc51c
--- /dev/null
+++ b/deps/npm/node_modules/duplexer3/index.js
@@ -0,0 +1,76 @@
+"use strict";
+
+var stream = require("stream");
+
+function DuplexWrapper(options, writable, readable) {
+  if (typeof readable === "undefined") {
+    readable = writable;
+    writable = options;
+    options = null;
+  }
+
+  stream.Duplex.call(this, options);
+
+  if (typeof readable.read !== "function") {
+    readable = (new stream.Readable(options)).wrap(readable);
+  }
+
+  this._writable = writable;
+  this._readable = readable;
+  this._waiting = false;
+
+  var self = this;
+
+  writable.once("finish", function() {
+    self.end();
+  });
+
+  this.once("finish", function() {
+    writable.end();
+  });
+
+  readable.on("readable", function() {
+    if (self._waiting) {
+      self._waiting = false;
+      self._read();
+    }
+  });
+
+  readable.once("end", function() {
+    self.push(null);
+  });
+
+  if (!options || typeof options.bubbleErrors === "undefined" || options.bubbleErrors) {
+    writable.on("error", function(err) {
+      self.emit("error", err);
+    });
+
+    readable.on("error", function(err) {
+      self.emit("error", err);
+    });
+  }
+}
+
+DuplexWrapper.prototype = Object.create(stream.Duplex.prototype, {constructor: {value: DuplexWrapper}});
+
+DuplexWrapper.prototype._write = function _write(input, encoding, done) {
+  this._writable.write(input, encoding, done);
+};
+
+DuplexWrapper.prototype._read = function _read() {
+  var buf;
+  var reads = 0;
+  while ((buf = this._readable.read()) !== null) {
+    this.push(buf);
+    reads++;
+  }
+  if (reads === 0) {
+    this._waiting = true;
+  }
+};
+
+module.exports = function duplex2(options, writable, readable) {
+  return new DuplexWrapper(options, writable, readable);
+};
+
+module.exports.DuplexWrapper = DuplexWrapper;