avoid internal usage of third-party .bind polyfills, close #1034

Author: zloirock

packages/core-js/internals/function-apply.js

@@ -1,9 +1,10 @@
+var NATIVE_BIND = require('../internals/function-bind-native');
+
 var FunctionPrototype = Function.prototype;
 var apply = FunctionPrototype.apply;
-var bind = FunctionPrototype.bind;
 var call = FunctionPrototype.call;
 
 // eslint-disable-next-line es/no-reflect -- safe
-module.exports = typeof Reflect == 'object' && Reflect.apply || (bind ? call.bind(apply) : function () {
+module.exports = typeof Reflect == 'object' && Reflect.apply || (NATIVE_BIND ? call.bind(apply) : function () {
   return call.apply(apply, arguments);
 });

packages/core-js/internals/function-bind-context.js

@@ -1,12 +1,13 @@
 var uncurryThis = require('../internals/function-uncurry-this');
 var aCallable = require('../internals/a-callable');
+var NATIVE_BIND = require('../internals/function-bind-native');
 
 var bind = uncurryThis(uncurryThis.bind);
 
 // optional / simple context binding
 module.exports = function (fn, that) {
   aCallable(fn);
-  return that === undefined ? fn : bind ? bind(fn, that) : function (/* ...args */) {
+  return that === undefined ? fn : NATIVE_BIND ? bind(fn, that) : function (/* ...args */) {
     return fn.apply(that, arguments);
   };
 };

packages/core-js/internals/function-bind-native.js

@@ -0,0 +1,7 @@
+var fails = require('../internals/fails');
+
+module.exports = !fails(function () {
+  var test = (function () { /* empty */ }).bind();
+  // eslint-disable-next-line no-prototype-builtins -- safe
+  return typeof test != 'function' || test.hasOwnProperty('prototype');
+});

packages/core-js/internals/function-bind.js

@@ -1,11 +1,11 @@
 'use strict';
 var global = require('../internals/global');
 var uncurryThis = require('../internals/function-uncurry-this');
-var fails = require('../internals/fails');
 var aCallable = require('../internals/a-callable');
 var isObject = require('../internals/is-object');
 var hasOwn = require('../internals/has-own-property');
 var arraySlice = require('../internals/array-slice');
+var NATIVE_BIND = require('../internals/function-bind-native');
 
 var Function = global.Function;
 var concat = uncurryThis([].concat);
@@ -21,11 +21,7 @@ var construct = function (C, argsLength, args) {
 
 // `Function.prototype.bind` method implementation
 // https://tc39.es/ecma262/#sec-function.prototype.bind
-module.exports = fails(function () {
-  // detect broken third-party polyfills
-  var Test = function () { /* empty */ };
-  return !(new (Test.bind())() instanceof Test) || (function (a, b) { return this + a + b; }).bind(1, 2)(3) !== 6;
-}) ? function bind(that /* , ...args */) {
+module.exports = NATIVE_BIND ? Function.bind : function bind(that /* , ...args */) {
   var F = aCallable(this);
   var Prototype = F.prototype;
   var partArgs = arraySlice(arguments, 1);
@@ -35,4 +31,4 @@ module.exports = fails(function () {
   };
   if (isObject(Prototype)) boundFunction.prototype = Prototype;
   return boundFunction;
-} : Function.bind;
+};

packages/core-js/internals/function-call.js

@@ -1,5 +1,7 @@
+var NATIVE_BIND = require('../internals/function-bind-native');
+
 var call = Function.prototype.call;
 
-module.exports = call.bind ? call.bind(call) : function () {
+module.exports = NATIVE_BIND ? call.bind(call) : function () {
   return call.apply(call, arguments);
 };

packages/core-js/internals/function-uncurry-this.js

@@ -1,9 +1,11 @@
+var NATIVE_BIND = require('../internals/function-bind-native');
+
 var FunctionPrototype = Function.prototype;
 var bind = FunctionPrototype.bind;
 var call = FunctionPrototype.call;
-var uncurryThis = bind && bind.bind(call, call);
+var uncurryThis = NATIVE_BIND && bind.bind(call, call);
 
-module.exports = bind ? function (fn) {
+module.exports = NATIVE_BIND ? function (fn) {
   return fn && uncurryThis(fn);
 } : function (fn) {
   return fn && function () {

tests/compat/tests.js

@@ -528,8 +528,9 @@ GLOBAL.tests = {
     return escape;
   },
   'es.function.bind': function () {
-    var Test = function () { /* empty */ };
-    return (new (Test.bind())() instanceof Test) && (function (a, b) { return this + a + b; }).bind(1, 2)(3) === 6;
+    var test = (function () { /* empty */ }).bind();
+    // eslint-disable-next-line no-prototype-builtins -- safe
+    return typeof test == 'function' && !test.hasOwnProperty('prototype');
   },
   'es.function.has-instance': [SYMBOLS_SUPPORT, function () {
     return Symbol.hasInstance in Function.prototype;