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

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+'use strict';
+var $ = require('../internals/export');
+var call = require('../internals/function-call');
+var toSetLike = require('../internals/to-set-like');
+var $union = require('../internals/set-union');
+
+// `Set.prototype.union` method
+// https://github.com/tc39/proposal-set-methods
+// TODO: Obsolete version, remove from `core-js@4`
+$({ target: 'Set', proto: true, real: true, forced: true }, {
+  union: function union(other) {
+    return call($union, this, toSetLike(other));
+  }
+});