1 files changed, 20 insertions, 0 deletions
diff --git a/node_modules/es6-weak-map/is-implemented.js b/node_modules/es6-weak-map/is-implemented.js
new file mode 100644
index 000000000..6ef5082ef
--- /dev/null
+++ b/node_modules/es6-weak-map/is-implemented.js
@@ -0,0 +1,20 @@
+'use strict';
+
+module.exports = function () {
+	var weakMap, x;
+	if (typeof WeakMap !== 'function') return false;
+	try {
+		// WebKit doesn't support arguments and crashes
+		weakMap = new WeakMap([[x = {}, 'one'], [{}, 'two'], [{}, 'three']]);
+	} catch (e) {
+		return false;
+	}
+	if (String(weakMap) !== '[object WeakMap]') return false;
+	if (typeof weakMap.set !== 'function') return false;
+	if (weakMap.set({}, 1) !== weakMap) return false;
+	if (typeof weakMap.delete !== 'function') return false;
+	if (typeof weakMap.has !== 'function') return false;
+	if (weakMap.get(x) !== 'one') return false;
+
+	return true;
+};