incrementally verify denoms

The denominations are not stored in a separate object store.

1 files changed, 35 insertions, 7 deletions

diff --git a/node_modules/readable-stream/lib/_stream_writable.js b/node_modules/readable-stream/lib/_stream_writable.js
index ed5efcbd2..4d9c62ba6 100644
--- a/node_modules/readable-stream/lib/_stream_writable.js
+++ b/node_modules/readable-stream/lib/_stream_writable.js
@@ -14,6 +14,10 @@ var processNextTick = require('process-nextick-args');
 var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
 /*</replacement>*/
 
+/*<replacement>*/
+var Duplex;
+/*</replacement>*/
+
 Writable.WritableState = WritableState;
 
 /*<replacement>*/
@@ -54,7 +58,6 @@ function WriteReq(chunk, encoding, cb) {
   this.next = null;
 }
 
-var Duplex;
 function WritableState(options, stream) {
   Duplex = Duplex || require('./_stream_duplex');
 
@@ -76,6 +79,7 @@ function WritableState(options, stream) {
   // cast to ints.
   this.highWaterMark = ~ ~this.highWaterMark;
 
+  // drain event flag.
   this.needDrain = false;
   // at the start of calling end()
   this.ending = false;
@@ -150,7 +154,7 @@ function WritableState(options, stream) {
   this.corkedRequestsFree = new CorkedRequest(this);
 }
 
-WritableState.prototype.getBuffer = function writableStateGetBuffer() {
+WritableState.prototype.getBuffer = function getBuffer() {
   var current = this.bufferedRequest;
   var out = [];
   while (current) {
@@ -170,13 +174,37 @@ WritableState.prototype.getBuffer = function writableStateGetBuffer() {
   } catch (_) {}
 })();
 
-var Duplex;
+// Test _writableState for inheritance to account for Duplex streams,
+// whose prototype chain only points to Readable.
+var realHasInstance;
+if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
+  realHasInstance = Function.prototype[Symbol.hasInstance];
+  Object.defineProperty(Writable, Symbol.hasInstance, {
+    value: function (object) {
+      if (realHasInstance.call(this, object)) return true;
+
+      return object && object._writableState instanceof WritableState;
+    }
+  });
+} else {
+  realHasInstance = function (object) {
+    return object instanceof this;
+  };
+}
+
 function Writable(options) {
   Duplex = Duplex || require('./_stream_duplex');
 
-  // Writable ctor is applied to Duplexes, though they're not
-  // instanceof Writable, they're instanceof Readable.
-  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
+  // Writable ctor is applied to Duplexes, too.
+  // `realHasInstance` is necessary because using plain `instanceof`
+  // would return false, as no `_writableState` property is attached.
+
+  // Trying to use the custom `instanceof` for Writable here will also break the
+  // Node.js LazyTransform implementation, which has a non-trivial getter for
+  // `_writableState` that would lead to infinite recursion.
+  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
+    return new Writable(options);
+  }
 
   this._writableState = new WritableState(options, this);
 
@@ -436,7 +464,7 @@ function clearBuffer(stream, state) {
 }
 
 Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('not implemented'));
+  cb(new Error('_write() is not implemented'));
 };
 
 Writable.prototype._writev = null;