stuff

buildfiles/node_modules/core-js/modules/esnext.set.union.js

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+'use strict';
+var $ = require('../internals/export');
+var IS_PURE = require('../internals/is-pure');
+var getBuiltIn = require('../internals/get-built-in');
+var anObject = require('../internals/an-object');
+var aFunction = require('../internals/a-function');
+var speciesConstructor = require('../internals/species-constructor');
+var iterate = require('../internals/iterate');
+
+// `Set.prototype.union` method
+// https://github.com/tc39/proposal-set-methods
+$({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
+  union: function union(iterable) {
+    var set = anObject(this);
+    var newSet = new (speciesConstructor(set, getBuiltIn('Set')))(set);
+    iterate(iterable, aFunction(newSet.add), { that: newSet });
+    return newSet;
+  }
+});