1 files changed, 9 insertions, 0 deletions
diff --git a/tools/eslint/node_modules/escope/node_modules/es6-weak-map/node_modules/es5-ext/error/is-error.js b/tools/eslint/node_modules/escope/node_modules/es6-weak-map/node_modules/es5-ext/error/is-error.js
new file mode 100644
index 0000000000..422705faf7
--- /dev/null
+++ b/tools/eslint/node_modules/escope/node_modules/es6-weak-map/node_modules/es5-ext/error/is-error.js
@@ -0,0 +1,9 @@
+'use strict';
+
+var toString = Object.prototype.toString
+
+  , id = toString.call(new Error());
+
+module.exports = function (x) {
+	return (x && ((x instanceof Error) || (toString.call(x)) === id)) || false;
+};