Avoid hitting __proto__

ChALkeR · isaacs · commit c55c1b8cb325 · 2021-02-05T10:44:04.000-08:00
PR-URL: #201 Credit: @ChALkeR Close: #201 Reviewed-by: @ljharb, @coreyfarrell
diff --git a/clone.js b/clone.js
@@ -2,12 +2,16 @@
 
 module.exports = clone
 
+var getPrototypeOf = Object.getPrototypeOf || function (obj) {
+  return obj.__proto__
+}
+
 function clone (obj) {
   if (obj === null || typeof obj !== 'object')
     return obj
 
   if (obj instanceof Object)
-    var copy = { __proto__: obj.__proto__ }
+    var copy = { __proto__: getPrototypeOf(obj) }
   else
     var copy = Object.create(null)
 
diff --git a/polyfills.js b/polyfills.js
@@ -133,7 +133,7 @@ function patch (fs) {
     }
 
     // This ensures `util.promisify` works as it does for native `fs.read`.
-    read.__proto__ = fs$read
+    if (Object.setPrototypeOf) Object.setPrototypeOf(read, fs$read)
     return read
   })(fs.read)
 

Original file line number	Diff line number	Diff line change
`@@ -133,7 +133,7 @@ function patch (fs) {`
`133`	`133`	`}`
`134`	`134`
`135`	`135`	// This ensures `util.promisify` works as it does for native `fs.read`.
`136`		`- read.__proto__ = fs$read`
	`136`	`+ if (Object.setPrototypeOf) Object.setPrototypeOf(read, fs$read)`
`137`	`137`	`return read`
`138`	`138`	`})(fs.read)`
`139`	`139`