lib: use null-prototype objects for property descriptors

Refs: https://github.com/nodejs/node/pull/42921

PR-URL: https://github.com/nodejs/node/pull/43270
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/events.js b/lib/events.js
index 7b5de246b9..ad5ded2d0e 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -219,6 +219,7 @@ EventEmitter.usingDomains = false;
 
 EventEmitter.captureRejectionSymbol = kRejection;
 ObjectDefineProperty(EventEmitter, 'captureRejections', {
+  __proto__: null,
   get() {
     return EventEmitter.prototype[kCapture];
   },
@@ -231,6 +232,7 @@ ObjectDefineProperty(EventEmitter, 'captureRejections', {
 });
 
 ObjectDefineProperty(EventEmitter, 'EventEmitterAsyncResource', {
+  __proto__: null,
   enumerable: true,
   get: lazyEventEmitterAsyncResource,
   set: undefined,
@@ -241,6 +243,7 @@ EventEmitter.errorMonitor = kErrorMonitor;
 
 // The default for captureRejections is false
 ObjectDefineProperty(EventEmitter.prototype, kCapture, {
+  __proto__: null,
   value: false,
   writable: true,
   enumerable: false
@@ -260,6 +263,7 @@ function checkListener(listener) {
 }
 
 ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {
+  __proto__: null,
   enumerable: true,
   get: function() {
     return defaultMaxListeners;
@@ -276,12 +280,14 @@ ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {
 
 ObjectDefineProperties(EventEmitter, {
   kMaxEventTargetListeners: {
+    __proto__: null,
     value: kMaxEventTargetListeners,
     enumerable: false,
     configurable: false,
     writable: false,
   },
   kMaxEventTargetListenersWarned: {
+    __proto__: null,
     value: kMaxEventTargetListenersWarned,
     enumerable: false,
     configurable: false,
@@ -493,6 +499,7 @@ EventEmitter.prototype.emit = function emit(type, ...args) {
         const capture = {};
         ErrorCaptureStackTrace(capture, EventEmitter.prototype.emit);
         ObjectDefineProperty(er, kEnhanceStackBeforeInspector, {
+          __proto__: null,
           value: FunctionPrototypeBind(enhanceStackTrace, this, er, capture),
           configurable: true
         });