--- /dev/null
+'use strict';
+require('../../modules/es.string.iterator');
+require('../../modules/es.weak-set');
+require('../../modules/esnext.weak-set.from');
+require('../../modules/web.dom-collections.iterator');
+var path = require('../../internals/path');
+
+var WeakSet = path.WeakSet;
+var weakSetfrom = WeakSet.from;
+
+module.exports = function from(source, mapFn, thisArg) {
+ return weakSetfrom.call(typeof this === 'function' ? this : WeakSet, source, mapFn, thisArg);
+};