7 files changed, 633 insertions, 93 deletions
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/BufferList.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/BufferList.js
deleted file mode 100644
index aefc68bd90..0000000000
--- a/deps/npm/node_modules/readable-stream/lib/internal/streams/BufferList.js
+++ /dev/null
@@ -1,79 +0,0 @@
-'use strict';
-
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-
-var Buffer = require('safe-buffer').Buffer;
-var util = require('util');
-
-function copyBuffer(src, target, offset) {
-  src.copy(target, offset);
-}
-
-module.exports = function () {
-  function BufferList() {
-    _classCallCheck(this, BufferList);
-
-    this.head = null;
-    this.tail = null;
-    this.length = 0;
-  }
-
-  BufferList.prototype.push = function push(v) {
-    var entry = { data: v, next: null };
-    if (this.length > 0) this.tail.next = entry;else this.head = entry;
-    this.tail = entry;
-    ++this.length;
-  };
-
-  BufferList.prototype.unshift = function unshift(v) {
-    var entry = { data: v, next: this.head };
-    if (this.length === 0) this.tail = entry;
-    this.head = entry;
-    ++this.length;
-  };
-
-  BufferList.prototype.shift = function shift() {
-    if (this.length === 0) return;
-    var ret = this.head.data;
-    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
-    --this.length;
-    return ret;
-  };
-
-  BufferList.prototype.clear = function clear() {
-    this.head = this.tail = null;
-    this.length = 0;
-  };
-
-  BufferList.prototype.join = function join(s) {
-    if (this.length === 0) return '';
-    var p = this.head;
-    var ret = '' + p.data;
-    while (p = p.next) {
-      ret += s + p.data;
-    }return ret;
-  };
-
-  BufferList.prototype.concat = function concat(n) {
-    if (this.length === 0) return Buffer.alloc(0);
-    if (this.length === 1) return this.head.data;
-    var ret = Buffer.allocUnsafe(n >>> 0);
-    var p = this.head;
-    var i = 0;
-    while (p) {
-      copyBuffer(p.data, ret, i);
-      i += p.data.length;
-      p = p.next;
-    }
-    return ret;
-  };
-
-  return BufferList;
-}();
-
-if (util && util.inspect && util.inspect.custom) {
-  module.exports.prototype[util.inspect.custom] = function () {
-    var obj = util.inspect({ length: this.length });
-    return this.constructor.name + ' ' + obj;
-  };
-}
-\ No newline at end of file
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/async_iterator.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/async_iterator.js
new file mode 100644
index 0000000000..79a6e1e11e
--- /dev/null
+++ b/deps/npm/node_modules/readable-stream/lib/internal/streams/async_iterator.js
@@ -0,0 +1,204 @@
+'use strict';
+
+var _Object$setPrototypeO;
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+var finished = require('./end-of-stream');
+
+var kLastResolve = Symbol('lastResolve');
+var kLastReject = Symbol('lastReject');
+var kError = Symbol('error');
+var kEnded = Symbol('ended');
+var kLastPromise = Symbol('lastPromise');
+var kHandlePromise = Symbol('handlePromise');
+var kStream = Symbol('stream');
+
+function createIterResult(value, done) {
+  return {
+    value: value,
+    done: done
+  };
+}
+
+function readAndResolve(iter) {
+  var resolve = iter[kLastResolve];
+
+  if (resolve !== null) {
+    var data = iter[kStream].read(); // we defer if data is null
+    // we can be expecting either 'end' or
+    // 'error'
+
+    if (data !== null) {
+      iter[kLastPromise] = null;
+      iter[kLastResolve] = null;
+      iter[kLastReject] = null;
+      resolve(createIterResult(data, false));
+    }
+  }
+}
+
+function onReadable(iter) {
+  // we wait for the next tick, because it might
+  // emit an error with process.nextTick
+  process.nextTick(readAndResolve, iter);
+}
+
+function wrapForNext(lastPromise, iter) {
+  return function (resolve, reject) {
+    lastPromise.then(function () {
+      iter[kHandlePromise](resolve, reject);
+    }, reject);
+  };
+}
+
+var AsyncIteratorPrototype = Object.getPrototypeOf(function () {});
+var ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf((_Object$setPrototypeO = {
+  get stream() {
+    return this[kStream];
+  },
+
+  next: function next() {
+    var _this = this;
+
+    // if we have detected an error in the meanwhile
+    // reject straight away
+    var error = this[kError];
+
+    if (error !== null) {
+      return Promise.reject(error);
+    }
+
+    if (this[kEnded]) {
+      return Promise.resolve(createIterResult(null, true));
+    }
+
+    if (this[kStream].destroyed) {
+      // We need to defer via nextTick because if .destroy(err) is
+      // called, the error will be emitted via nextTick, and
+      // we cannot guarantee that there is no error lingering around
+      // waiting to be emitted.
+      return new Promise(function (resolve, reject) {
+        process.nextTick(function () {
+          if (_this[kError]) {
+            reject(_this[kError]);
+          } else {
+            resolve(createIterResult(null, true));
+          }
+        });
+      });
+    } // if we have multiple next() calls
+    // we will wait for the previous Promise to finish
+    // this logic is optimized to support for await loops,
+    // where next() is only called once at a time
+
+
+    var lastPromise = this[kLastPromise];
+    var promise;
+
+    if (lastPromise) {
+      promise = new Promise(wrapForNext(lastPromise, this));
+    } else {
+      // fast path needed to support multiple this.push()
+      // without triggering the next() queue
+      var data = this[kStream].read();
+
+      if (data !== null) {
+        return Promise.resolve(createIterResult(data, false));
+      }
+
+      promise = new Promise(this[kHandlePromise]);
+    }
+
+    this[kLastPromise] = promise;
+    return promise;
+  }
+}, _defineProperty(_Object$setPrototypeO, Symbol.asyncIterator, function () {
+  return this;
+}), _defineProperty(_Object$setPrototypeO, "return", function _return() {
+  var _this2 = this;
+
+  // destroy(err, cb) is a private API
+  // we can guarantee we have that here, because we control the
+  // Readable class this is attached to
+  return new Promise(function (resolve, reject) {
+    _this2[kStream].destroy(null, function (err) {
+      if (err) {
+        reject(err);
+        return;
+      }
+
+      resolve(createIterResult(null, true));
+    });
+  });
+}), _Object$setPrototypeO), AsyncIteratorPrototype);
+
+var createReadableStreamAsyncIterator = function createReadableStreamAsyncIterator(stream) {
+  var _Object$create;
+
+  var iterator = Object.create(ReadableStreamAsyncIteratorPrototype, (_Object$create = {}, _defineProperty(_Object$create, kStream, {
+    value: stream,
+    writable: true
+  }), _defineProperty(_Object$create, kLastResolve, {
+    value: null,
+    writable: true
+  }), _defineProperty(_Object$create, kLastReject, {
+    value: null,
+    writable: true
+  }), _defineProperty(_Object$create, kError, {
+    value: null,
+    writable: true
+  }), _defineProperty(_Object$create, kEnded, {
+    value: stream._readableState.endEmitted,
+    writable: true
+  }), _defineProperty(_Object$create, kLastPromise, {
+    value: null,
+    writable: true
+  }), _defineProperty(_Object$create, kHandlePromise, {
+    value: function value(resolve, reject) {
+      var data = iterator[kStream].read();
+
+      if (data) {
+        iterator[kLastPromise] = null;
+        iterator[kLastResolve] = null;
+        iterator[kLastReject] = null;
+        resolve(createIterResult(data, false));
+      } else {
+        iterator[kLastResolve] = resolve;
+        iterator[kLastReject] = reject;
+      }
+    },
+    writable: true
+  }), _Object$create));
+  finished(stream, function (err) {
+    if (err && err.code !== 'ERR_STREAM_PREMATURE_CLOSE') {
+      var reject = iterator[kLastReject]; // reject if we are waiting for data in the Promise
+      // returned by next() and store the error
+
+      if (reject !== null) {
+        iterator[kLastPromise] = null;
+        iterator[kLastResolve] = null;
+        iterator[kLastReject] = null;
+        reject(err);
+      }
+
+      iterator[kError] = err;
+      return;
+    }
+
+    var resolve = iterator[kLastResolve];
+
+    if (resolve !== null) {
+      iterator[kLastPromise] = null;
+      iterator[kLastResolve] = null;
+      iterator[kLastReject] = null;
+      resolve(createIterResult(null, true));
+    }
+
+    iterator[kEnded] = true;
+  });
+  stream.on('readable', onReadable.bind(null, iterator));
+  return iterator;
+};
+
+module.exports = createReadableStreamAsyncIterator;
+\ No newline at end of file
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js
new file mode 100644
index 0000000000..ebaf5c72aa
--- /dev/null
+++ b/deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js
@@ -0,0 +1,189 @@
+'use strict';
+
+function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+var _require = require('buffer'),
+    Buffer = _require.Buffer;
+
+var _require2 = require('util'),
+    inspect = _require2.inspect;
+
+var custom = inspect && inspect.custom || 'inspect';
+
+function copyBuffer(src, target, offset) {
+  Buffer.prototype.copy.call(src, target, offset);
+}
+
+module.exports =
+/*#__PURE__*/
+function () {
+  function BufferList() {
+    this.head = null;
+    this.tail = null;
+    this.length = 0;
+  }
+
+  var _proto = BufferList.prototype;
+
+  _proto.push = function push(v) {
+    var entry = {
+      data: v,
+      next: null
+    };
+    if (this.length > 0) this.tail.next = entry;else this.head = entry;
+    this.tail = entry;
+    ++this.length;
+  };
+
+  _proto.unshift = function unshift(v) {
+    var entry = {
+      data: v,
+      next: this.head
+    };
+    if (this.length === 0) this.tail = entry;
+    this.head = entry;
+    ++this.length;
+  };
+
+  _proto.shift = function shift() {
+    if (this.length === 0) return;
+    var ret = this.head.data;
+    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
+    --this.length;
+    return ret;
+  };
+
+  _proto.clear = function clear() {
+    this.head = this.tail = null;
+    this.length = 0;
+  };
+
+  _proto.join = function join(s) {
+    if (this.length === 0) return '';
+    var p = this.head;
+    var ret = '' + p.data;
+
+    while (p = p.next) {
+      ret += s + p.data;
+    }
+
+    return ret;
+  };
+
+  _proto.concat = function concat(n) {
+    if (this.length === 0) return Buffer.alloc(0);
+    var ret = Buffer.allocUnsafe(n >>> 0);
+    var p = this.head;
+    var i = 0;
+
+    while (p) {
+      copyBuffer(p.data, ret, i);
+      i += p.data.length;
+      p = p.next;
+    }
+
+    return ret;
+  } // Consumes a specified amount of bytes or characters from the buffered data.
+  ;
+
+  _proto.consume = function consume(n, hasStrings) {
+    var ret;
+
+    if (n < this.head.data.length) {
+      // `slice` is the same for buffers and strings.
+      ret = this.head.data.slice(0, n);
+      this.head.data = this.head.data.slice(n);
+    } else if (n === this.head.data.length) {
+      // First chunk is a perfect match.
+      ret = this.shift();
+    } else {
+      // Result spans more than one buffer.
+      ret = hasStrings ? this._getString(n) : this._getBuffer(n);
+    }
+
+    return ret;
+  };
+
+  _proto.first = function first() {
+    return this.head.data;
+  } // Consumes a specified amount of characters from the buffered data.
+  ;
+
+  _proto._getString = function _getString(n) {
+    var p = this.head;
+    var c = 1;
+    var ret = p.data;
+    n -= ret.length;
+
+    while (p = p.next) {
+      var str = p.data;
+      var nb = n > str.length ? str.length : n;
+      if (nb === str.length) ret += str;else ret += str.slice(0, n);
+      n -= nb;
+
+      if (n === 0) {
+        if (nb === str.length) {
+          ++c;
+          if (p.next) this.head = p.next;else this.head = this.tail = null;
+        } else {
+          this.head = p;
+          p.data = str.slice(nb);
+        }
+
+        break;
+      }
+
+      ++c;
+    }
+
+    this.length -= c;
+    return ret;
+  } // Consumes a specified amount of bytes from the buffered data.
+  ;
+
+  _proto._getBuffer = function _getBuffer(n) {
+    var ret = Buffer.allocUnsafe(n);
+    var p = this.head;
+    var c = 1;
+    p.data.copy(ret);
+    n -= p.data.length;
+
+    while (p = p.next) {
+      var buf = p.data;
+      var nb = n > buf.length ? buf.length : n;
+      buf.copy(ret, ret.length - n, 0, nb);
+      n -= nb;
+
+      if (n === 0) {
+        if (nb === buf.length) {
+          ++c;
+          if (p.next) this.head = p.next;else this.head = this.tail = null;
+        } else {
+          this.head = p;
+          p.data = buf.slice(nb);
+        }
+
+        break;
+      }
+
+      ++c;
+    }
+
+    this.length -= c;
+    return ret;
+  } // Make sure the linked list only shows the minimal necessary information.
+  ;
+
+  _proto[custom] = function (_, options) {
+    return inspect(this, _objectSpread({}, options, {
+      // Only inspect one level.
+      depth: 0,
+      // It should not recurse.
+      customInspect: false
+    }));
+  };
+
+  return BufferList;
+}();
+\ No newline at end of file
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/destroy.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/destroy.js
index 5a0a0d88ce..63ae49928d 100644
--- a/deps/npm/node_modules/readable-stream/lib/internal/streams/destroy.js
+++ b/deps/npm/node_modules/readable-stream/lib/internal/streams/destroy.js
@@ -1,11 +1,5 @@
-'use strict';
+'use strict'; // undocumented cb() API, needed for core, not for public API
 
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-// undocumented cb() API, needed for core, not for public API
 function destroy(err, cb) {
   var _this = this;
 
@@ -16,37 +10,52 @@ function destroy(err, cb) {
     if (cb) {
       cb(err);
     } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
-      pna.nextTick(emitErrorNT, this, err);
+      process.nextTick(emitErrorNT, this, err);
     }
-    return this;
-  }
 
-  // we set destroyed to true before firing error callbacks in order
+    return this;
+  } // we set destroyed to true before firing error callbacks in order
   // to make it re-entrance safe in case destroy() is called within callbacks
 
+
   if (this._readableState) {
     this._readableState.destroyed = true;
-  }
+  } // if this is a duplex stream mark the writable part as destroyed as well
+
 
-  // if this is a duplex stream mark the writable part as destroyed as well
   if (this._writableState) {
     this._writableState.destroyed = true;
   }
 
   this._destroy(err || null, function (err) {
     if (!cb && err) {
-      pna.nextTick(emitErrorNT, _this, err);
+      process.nextTick(emitErrorAndCloseNT, _this, err);
+
       if (_this._writableState) {
         _this._writableState.errorEmitted = true;
       }
     } else if (cb) {
+      process.nextTick(emitCloseNT, _this);
       cb(err);
+    } else {
+      process.nextTick(emitCloseNT, _this);
     }
   });
 
   return this;
 }
 
+function emitErrorAndCloseNT(self, err) {
+  emitErrorNT(self, err);
+  emitCloseNT(self);
+}
+
+function emitCloseNT(self) {
+  if (self._writableState && !self._writableState.emitClose) return;
+  if (self._readableState && !self._readableState.emitClose) return;
+  self.emit('close');
+}
+
 function undestroy() {
   if (this._readableState) {
     this._readableState.destroyed = false;
@@ -59,6 +68,8 @@ function undestroy() {
     this._writableState.destroyed = false;
     this._writableState.ended = false;
     this._writableState.ending = false;
+    this._writableState.finalCalled = false;
+    this._writableState.prefinished = false;
     this._writableState.finished = false;
     this._writableState.errorEmitted = false;
   }
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/end-of-stream.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/end-of-stream.js
new file mode 100644
index 0000000000..cf23d53b5a
--- /dev/null
+++ b/deps/npm/node_modules/readable-stream/lib/internal/streams/end-of-stream.js
@@ -0,0 +1,91 @@
+// Ported from https://github.com/mafintosh/end-of-stream with
+// permission from the author, Mathias Buus (@mafintosh).
+'use strict';
+
+var ERR_STREAM_PREMATURE_CLOSE = require('../../../errors').codes.ERR_STREAM_PREMATURE_CLOSE;
+
+function noop() {}
+
+function isRequest(stream) {
+  return stream.setHeader && typeof stream.abort === 'function';
+}
+
+function once(callback) {
+  var called = false;
+  return function (err) {
+    if (called) return;
+    called = true;
+    callback.call(this, err);
+  };
+}
+
+function eos(stream, opts, callback) {
+  if (typeof opts === 'function') return eos(stream, null, opts);
+  if (!opts) opts = {};
+  callback = once(callback || noop);
+  var ws = stream._writableState;
+  var rs = stream._readableState;
+  var readable = opts.readable || opts.readable !== false && stream.readable;
+  var writable = opts.writable || opts.writable !== false && stream.writable;
+
+  var onlegacyfinish = function onlegacyfinish() {
+    if (!stream.writable) onfinish();
+  };
+
+  var onfinish = function onfinish() {
+    writable = false;
+    if (!readable) callback.call(stream);
+  };
+
+  var onend = function onend() {
+    readable = false;
+    if (!writable) callback.call(stream);
+  };
+
+  var onerror = function onerror(err) {
+    callback.call(stream, err);
+  };
+
+  var onclose = function onclose() {
+    if (readable && !(rs && rs.ended)) {
+      return callback.call(stream, new ERR_STREAM_PREMATURE_CLOSE());
+    }
+
+    if (writable && !(ws && ws.ended)) {
+      return callback.call(stream, new ERR_STREAM_PREMATURE_CLOSE());
+    }
+  };
+
+  var onrequest = function onrequest() {
+    stream.req.on('finish', onfinish);
+  };
+
+  if (isRequest(stream)) {
+    stream.on('complete', onfinish);
+    stream.on('abort', onclose);
+    if (stream.req) onrequest();else stream.on('request', onrequest);
+  } else if (writable && !ws) {
+    // legacy streams
+    stream.on('end', onlegacyfinish);
+    stream.on('close', onlegacyfinish);
+  }
+
+  stream.on('end', onend);
+  stream.on('finish', onfinish);
+  if (opts.error !== false) stream.on('error', onerror);
+  stream.on('close', onclose);
+  return function () {
+    stream.removeListener('complete', onfinish);
+    stream.removeListener('abort', onclose);
+    stream.removeListener('request', onrequest);
+    if (stream.req) stream.req.removeListener('finish', onfinish);
+    stream.removeListener('end', onlegacyfinish);
+    stream.removeListener('close', onlegacyfinish);
+    stream.removeListener('finish', onfinish);
+    stream.removeListener('end', onend);
+    stream.removeListener('error', onerror);
+    stream.removeListener('close', onclose);
+  };
+}
+
+module.exports = eos;
+\ No newline at end of file
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/pipeline.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/pipeline.js
new file mode 100644
index 0000000000..6589909889
--- /dev/null
+++ b/deps/npm/node_modules/readable-stream/lib/internal/streams/pipeline.js
@@ -0,0 +1,97 @@
+// Ported from https://github.com/mafintosh/pump with
+// permission from the author, Mathias Buus (@mafintosh).
+'use strict';
+
+var eos;
+
+function once(callback) {
+  var called = false;
+  return function () {
+    if (called) return;
+    called = true;
+    callback.apply(void 0, arguments);
+  };
+}
+
+var _require$codes = require('../../../errors').codes,
+    ERR_MISSING_ARGS = _require$codes.ERR_MISSING_ARGS,
+    ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED;
+
+function noop(err) {
+  // Rethrow the error if it exists to avoid swallowing it
+  if (err) throw err;
+}
+
+function isRequest(stream) {
+  return stream.setHeader && typeof stream.abort === 'function';
+}
+
+function destroyer(stream, reading, writing, callback) {
+  callback = once(callback);
+  var closed = false;
+  stream.on('close', function () {
+    closed = true;
+  });
+  if (eos === undefined) eos = require('./end-of-stream');
+  eos(stream, {
+    readable: reading,
+    writable: writing
+  }, function (err) {
+    if (err) return callback(err);
+    closed = true;
+    callback();
+  });
+  var destroyed = false;
+  return function (err) {
+    if (closed) return;
+    if (destroyed) return;
+    destroyed = true; // request.destroy just do .end - .abort is what we want
+
+    if (isRequest(stream)) return stream.abort();
+    if (typeof stream.destroy === 'function') return stream.destroy();
+    callback(err || new ERR_STREAM_DESTROYED('pipe'));
+  };
+}
+
+function call(fn) {
+  fn();
+}
+
+function pipe(from, to) {
+  return from.pipe(to);
+}
+
+function popCallback(streams) {
+  if (!streams.length) return noop;
+  if (typeof streams[streams.length - 1] !== 'function') return noop;
+  return streams.pop();
+}
+
+function pipeline() {
+  for (var _len = arguments.length, streams = new Array(_len), _key = 0; _key < _len; _key++) {
+    streams[_key] = arguments[_key];
+  }
+
+  var callback = popCallback(streams);
+  if (Array.isArray(streams[0])) streams = streams[0];
+
+  if (streams.length < 2) {
+    throw new ERR_MISSING_ARGS('streams');
+  }
+
+  var error;
+  var destroys = streams.map(function (stream, i) {
+    var reading = i < streams.length - 1;
+    var writing = i > 0;
+    return destroyer(stream, reading, writing, function (err) {
+      if (!error) error = err;
+      if (err) destroys.forEach(call);
+      if (reading) return;
+      destroys.forEach(call);
+      callback(error);
+    });
+  });
+  return streams.reduce(pipe);
+}
+
+module.exports = pipeline;
+\ No newline at end of file
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/state.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/state.js
new file mode 100644
index 0000000000..19887eb8a9
--- /dev/null
+++ b/deps/npm/node_modules/readable-stream/lib/internal/streams/state.js
@@ -0,0 +1,27 @@
+'use strict';
+
+var ERR_INVALID_OPT_VALUE = require('../../../errors').codes.ERR_INVALID_OPT_VALUE;
+
+function highWaterMarkFrom(options, isDuplex, duplexKey) {
+  return options.highWaterMark != null ? options.highWaterMark : isDuplex ? options[duplexKey] : null;
+}
+
+function getHighWaterMark(state, options, duplexKey, isDuplex) {
+  var hwm = highWaterMarkFrom(options, isDuplex, duplexKey);
+
+  if (hwm != null) {
+    if (!(isFinite(hwm) && Math.floor(hwm) === hwm) || hwm < 0) {
+      var name = isDuplex ? duplexKey : 'highWaterMark';
+      throw new ERR_INVALID_OPT_VALUE(name, hwm);
+    }
+
+    return Math.floor(hwm);
+  } // Default value
+
+
+  return state.objectMode ? 16 : 16 * 1024;
+}
+
+module.exports = {
+  getHighWaterMark: getHighWaterMark
+};
+\ No newline at end of file