+++ /dev/null
-var $ = require('../internals/export');
-var getBuiltIn = require('../internals/get-built-in');
-var aFunction = require('../internals/a-function');
-var anObject = require('../internals/an-object');
-var isObject = require('../internals/is-object');
-var create = require('../internals/object-create');
-var bind = require('../internals/function-bind');
-var fails = require('../internals/fails');
-
-var nativeConstruct = getBuiltIn('Reflect', 'construct');
-
-// `Reflect.construct` method
-// https://tc39.github.io/ecma262/#sec-reflect.construct
-// MS Edge supports only 2 arguments and argumentsList argument is optional
-// FF Nightly sets third argument as `new.target`, but does not create `this` from it
-var NEW_TARGET_BUG = fails(function () {
- function F() { /* empty */ }
- return !(nativeConstruct(function () { /* empty */ }, [], F) instanceof F);
-});
-var ARGS_BUG = !fails(function () {
- nativeConstruct(function () { /* empty */ });
-});
-var FORCED = NEW_TARGET_BUG || ARGS_BUG;
-
-$({ target: 'Reflect', stat: true, forced: FORCED, sham: FORCED }, {
- construct: function construct(Target, args /* , newTarget */) {
- aFunction(Target);
- anObject(args);
- var newTarget = arguments.length < 3 ? Target : aFunction(arguments[2]);
- if (ARGS_BUG && !NEW_TARGET_BUG) return nativeConstruct(Target, args, newTarget);
- if (Target == newTarget) {
- // w/o altered newTarget, optimization for 0-4 arguments
- switch (args.length) {
- case 0: return new Target();
- case 1: return new Target(args[0]);
- case 2: return new Target(args[0], args[1]);
- case 3: return new Target(args[0], args[1], args[2]);
- case 4: return new Target(args[0], args[1], args[2], args[3]);
- }
- // w/o altered newTarget, lot of arguments case
- var $args = [null];
- $args.push.apply($args, args);
- return new (bind.apply(Target, $args))();
- }
- // with altered newTarget, not support built-in constructors
- var proto = newTarget.prototype;
- var instance = create(isObject(proto) ? proto : Object.prototype);
- var result = Function.apply.call(Target, instance, args);
- return isObject(result) ? result : instance;
- }
-});