fixup! events: refactor to use more primordials

Author: aduh95

lib/events.js

@@ -33,8 +33,10 @@ const {
   Boolean,
   Error,
   ErrorCaptureStackTrace,
+  Function,
   FunctionPrototypeBind,
   FunctionPrototypeCall,
+  FunctionPrototypeToString,
   MathMin,
   NumberIsNaN,
   ObjectCreate,
@@ -49,6 +51,7 @@ const {
   ReflectOwnKeys,
   String,
   StringPrototypeSplit,
+  StringPrototypeReplace,
   Symbol,
   SymbolFor,
   SymbolAsyncIterator
@@ -90,9 +93,6 @@ const lazyDOMException = hideStackFrames((message, name) => {
 });
 
 
-function EventEmitter(opts) {
-  FunctionPrototypeCall(EventEmitter.init, this, opts);
-}
 module.exports = EventEmitter;
 module.exports.once = once;
 module.exports.on = on;
@@ -199,7 +199,9 @@ EventEmitter.setMaxListeners =
     }
   };
 
-EventEmitter.init = function(opts) {
+let customInit;
+function EventEmitter(opts) {
+  if (customInit) return FunctionPrototypeCall(customInit, this, opts);
 
   if (this._events === undefined ||
       this._events === ObjectGetPrototypeOf(this)._events) {
@@ -221,7 +223,16 @@ EventEmitter.init = function(opts) {
     // prototype lookup in a very sensitive hot path.
     this[kCapture] = EventEmitter.prototype[kCapture];
   }
-};
+}
+ObjectDefineProperty(EventEmitter, 'init', {
+  enumerable: true,
+  get: () =>
+    new Function(StringPrototypeReplace(FunctionPrototypeToString(EventEmitter),
+                                        /^\s*if\s*\(customInit\)/, '')),
+  set: (init) => {
+    customInit = init;
+  }
+});
 
 function addCatch(that, promise, type, args) {
   if (!that[kCapture]) {