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node_modules/core-js-pure/internals/array-group.js

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+'use strict';
+var bind = require('../internals/function-bind-context');
+var uncurryThis = require('../internals/function-uncurry-this');
+var IndexedObject = require('../internals/indexed-object');
+var toObject = require('../internals/to-object');
+var toPropertyKey = require('../internals/to-property-key');
+var lengthOfArrayLike = require('../internals/length-of-array-like');
+var objectCreate = require('../internals/object-create');
+var arrayFromConstructorAndList = require('../internals/array-from-constructor-and-list');
+
+var $Array = Array;
+var push = uncurryThis([].push);
+
+module.exports = function ($this, callbackfn, that, specificConstructor) {
+  var O = toObject($this);
+  var self = IndexedObject(O);
+  var boundFunction = bind(callbackfn, that);
+  var target = objectCreate(null);
+  var length = lengthOfArrayLike(self);
+  var index = 0;
+  var Constructor, key, value;
+  for (;length > index; index++) {
+    value = self[index];
+    key = toPropertyKey(boundFunction(value, index, O));
+    // in some IE versions, `hasOwnProperty` returns incorrect result on integer keys
+    // but since it's a `null` prototype object, we can safely use `in`
+    if (key in target) push(target[key], value);
+    else target[key] = [value];
+  }
+  // TODO: Remove this block from `core-js@4`
+  if (specificConstructor) {
+    Constructor = specificConstructor(O);
+    if (Constructor !== $Array) {
+      for (key in target) target[key] = arrayFromConstructorAndList(Constructor, target[key]);
+    }
+  } return target;
+};