Migration datamodels !

node_modules/es6-weak-map/is-weak-map.js

@@ -0,0 +1,13 @@
+"use strict";
+
+var toStringTagSymbol = require("es6-symbol").toStringTag
+
+  , objToString = Object.prototype.toString
+  , id = "[object WeakMap]"
+  , Global = typeof WeakMap === "undefined" ? null : WeakMap;
+
+module.exports = function (value) {
+	return (value && ((Global && (value instanceof Global)) ||
+			(objToString.call(value) === id) || (value[toStringTagSymbol] === "WeakMap"))) ||
+			false;
+};