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