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node_modules/core-js/internals/set-intersection.js

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+'use strict';
+var aSet = require('../internals/a-set');
+var SetHelpers = require('../internals/set-helpers');
+var size = require('../internals/set-size');
+var getSetRecord = require('../internals/get-set-record');
+var iterateSet = require('../internals/set-iterate');
+var iterateSimple = require('../internals/iterate-simple');
+
+var Set = SetHelpers.Set;
+var add = SetHelpers.add;
+var has = SetHelpers.has;
+
+// `Set.prototype.intersection` method
+// https://github.com/tc39/proposal-set-methods
+module.exports = function intersection(other) {
+  var O = aSet(this);
+  var otherRec = getSetRecord(other);
+  var result = new Set();
+
+  if (size(O) > otherRec.size) {
+    iterateSimple(otherRec.getIterator(), function (e) {
+      if (has(O, e)) add(result, e);
+    });
+  } else {
+    iterateSet(O, function (e) {
+      if (otherRec.includes(e)) add(result, e);
+    });
+  }
+
+  return result;
+};