1 | var $ = require('../internals/export');
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2 | var getBuiltIn = require('../internals/get-built-in');
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3 | var aFunction = require('../internals/a-function');
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4 | var anObject = require('../internals/an-object');
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5 | var isObject = require('../internals/is-object');
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6 | var create = require('../internals/object-create');
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7 | var bind = require('../internals/function-bind');
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8 | var fails = require('../internals/fails');
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9 |
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10 | var nativeConstruct = getBuiltIn('Reflect', 'construct');
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11 |
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12 |
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13 |
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14 |
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15 |
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16 | var NEW_TARGET_BUG = fails(function () {
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17 | function F() { }
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18 | return !(nativeConstruct(function () { }, [], F) instanceof F);
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19 | });
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20 | var ARGS_BUG = !fails(function () {
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21 | nativeConstruct(function () { });
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22 | });
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23 | var FORCED = NEW_TARGET_BUG || ARGS_BUG;
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24 |
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25 | $({ target: 'Reflect', stat: true, forced: FORCED, sham: FORCED }, {
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26 | construct: function construct(Target, args /* , newTarget */) {
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27 | aFunction(Target);
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28 | anObject(args);
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29 | var newTarget = arguments.length < 3 ? Target : aFunction(arguments[2]);
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30 | if (ARGS_BUG && !NEW_TARGET_BUG) return nativeConstruct(Target, args, newTarget);
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31 | if (Target == newTarget) {
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32 |
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33 | switch (args.length) {
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34 | case 0: return new Target();
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35 | case 1: return new Target(args[0]);
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36 | case 2: return new Target(args[0], args[1]);
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37 | case 3: return new Target(args[0], args[1], args[2]);
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38 | case 4: return new Target(args[0], args[1], args[2], args[3]);
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39 | }
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40 |
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41 | var $args = [null];
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42 | $args.push.apply($args, args);
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43 | return new (bind.apply(Target, $args))();
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44 | }
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45 |
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46 | var proto = newTarget.prototype;
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47 | var instance = create(isObject(proto) ? proto : Object.prototype);
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48 | var result = Function.apply.call(Target, instance, args);
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49 | return isObject(result) ? result : instance;
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50 | }
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51 | });
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