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node_modules/core-js/modules/es.reflect.construct.js

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+'use strict';
+var $ = require('../internals/export');
+var getBuiltIn = require('../internals/get-built-in');
+var apply = require('../internals/function-apply');
+var bind = require('../internals/function-bind');
+var aConstructor = require('../internals/a-constructor');
+var anObject = require('../internals/an-object');
+var isObject = require('../internals/is-object');
+var create = require('../internals/object-create');
+var fails = require('../internals/fails');
+
+var nativeConstruct = getBuiltIn('Reflect', 'construct');
+var ObjectPrototype = Object.prototype;
+var push = [].push;
+
+// `Reflect.construct` method
+// https://tc39.es/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 */) {
+    aConstructor(Target);
+    anObject(args);
+    var newTarget = arguments.length < 3 ? Target : aConstructor(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];
+      apply(push, $args, args);
+      return new (apply(bind, Target, $args))();
+    }
+    // with altered newTarget, not support built-in constructors
+    var proto = newTarget.prototype;
+    var instance = create(isObject(proto) ? proto : ObjectPrototype);
+    var result = apply(Target, instance, args);
+    return isObject(result) ? result : instance;
+  }
+});