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

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+'use strict';
+var aSet = require('../internals/a-set');
+var add = require('../internals/set-helpers').add;
+var clone = require('../internals/set-clone');
+var getSetRecord = require('../internals/get-set-record');
+var iterateSimple = require('../internals/iterate-simple');
+
+// `Set.prototype.union` method
+// https://github.com/tc39/proposal-set-methods
+module.exports = function union(other) {
+  var O = aSet(this);
+  var keysIter = getSetRecord(other).getIterator();
+  var result = clone(O);
+  iterateSimple(keysIter, function (it) {
+    add(result, it);
+  });
+  return result;
+};