stream: pre-allocate _events

Author: ronag

lib/internal/streams/duplex.js

@@ -63,6 +63,21 @@ function Duplex(options) {
   if (!(this instanceof Duplex))
     return new Duplex(options);
 
+  this._events = {
+    close: undefined,
+    error: undefined,
+    prefinish: undefined,
+    finish: undefined,
+    drain: undefined,
+    data: undefined,
+    end: undefined,
+    pause: undefined,
+    resume: undefined,
+    readable: undefined,
+    pipe: undefined,
+    unpipe: undefined,
+  };
+
   this._readableState = new Readable.ReadableState(options, this, true);
   this._writableState = new Writable.WritableState(options, this, true);
 

lib/internal/streams/readable.js

@@ -316,6 +316,18 @@ function Readable(options) {
   if (!(this instanceof Readable))
     return new Readable(options);
 
+  this._events = {
+    close: undefined,
+    error: undefined,
+    data: undefined,
+    end: undefined,
+    pause: undefined,
+    resume: undefined,
+    readable: undefined,
+    pipe: undefined,
+    unpipe: undefined,
+  };
+
   this._readableState = new ReadableState(options, this, false);
 
   if (options) {

lib/internal/streams/writable.js

@@ -382,6 +382,14 @@ function Writable(options) {
   if (!(this instanceof Writable))
     return new Writable(options);
 
+  this._events = {
+    close: undefined,
+    error: undefined,
+    prefinish: undefined,
+    finish: undefined,
+    drain: undefined,
+  };
+
   this._writableState = new WritableState(options, this, false);
 
   if (options) {