1 files changed, 40 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/no-ex-assign.js b/tools/eslint/lib/rules/no-ex-assign.js
new file mode 100644
index 0000000000..6ea5a22360
--- /dev/null
+++ b/tools/eslint/lib/rules/no-ex-assign.js
@@ -0,0 +1,40 @@
+/**
+ * @fileoverview Rule to flag assignment of the exception parameter
+ * @author Stephen Murray <spmurrayzzz>
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    var catchStack = [];
+
+    return {
+
+        "CatchClause": function(node) {
+            catchStack.push(node.param.name);
+        },
+
+        "CatchClause:exit": function() {
+            catchStack.pop();
+        },
+
+        "AssignmentExpression": function(node) {
+
+            if (catchStack.length > 0) {
+
+                var exceptionName = catchStack[catchStack.length - 1];
+
+                if (node.left.name && node.left.name === exceptionName) {
+                    context.report(node, "Do not assign to the exception parameter.");
+                }
+            }
+        }
+
+    };
+
+};