install gulp

user/themes/anissabensalah/node_modules/es6-weak-map/valid-weak-map.js

@@ -0,0 +1,8 @@
+'use strict';
+
+var isWeakMap = require('./is-weak-map');
+
+module.exports = function (x) {
+	if (!isWeakMap(x)) throw new TypeError(x + " is not a WeakMap");
+	return x;
+};