1 files changed, 37 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/sort-vars.js b/tools/eslint/lib/rules/sort-vars.js
new file mode 100644
index 0000000000..8d4b6a8980
--- /dev/null
+++ b/tools/eslint/lib/rules/sort-vars.js
@@ -0,0 +1,37 @@
+/**
+ * @fileoverview Rule to require sorting of variables within a single Variable Declaration block
+ * @author Ilya Volodin
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    var configuration = context.options[0] || {},
+        ignoreCase = configuration.ignoreCase || false;
+
+    return {
+        "VariableDeclaration": function(node) {
+            node.declarations.reduce(function(memo, decl) {
+                var lastVariableName = memo.id.name,
+                    currenVariableName = decl.id.name;
+
+                if (ignoreCase) {
+                    lastVariableName = lastVariableName.toLowerCase();
+                    currenVariableName = currenVariableName.toLowerCase();
+                }
+
+                if (currenVariableName < lastVariableName) {
+                    context.report(decl, "Variables within the same declaration block should be sorted alphabetically");
+                    return memo;
+                } else {
+                    return decl;
+                }
+            }, node.declarations[0]);
+        }
+    };
+};