diff --git a/tools/.eslintrc.yaml b/tools/.eslintrc.yaml
new file mode 100644
index 00000000000000..e1405dd718bf0f
--- /dev/null
+++ b/tools/.eslintrc.yaml
@@ -0,0 +1,12 @@
+## Tools-specific linter rules
+
+rules:
+  # Stylistic Issues
+  # http://eslint.org/docs/rules/#stylistic-issues
+  indent: [2, 2, {ArrayExpression: first,
+                  CallExpression: {arguments: first},
+                  FunctionDeclaration: {parameters: first},
+                  FunctionExpression: {parameters: first},
+                  MemberExpression: off,
+                  ObjectExpression: first,
+                  SwitchCase: 1}]
diff --git a/tools/eslint-rules/required-modules.js b/tools/eslint-rules/required-modules.js
index 3e4a8e8aadfc82..4a444809b7115c 100644
--- a/tools/eslint-rules/required-modules.js
+++ b/tools/eslint-rules/required-modules.js
@@ -75,15 +75,15 @@ module.exports = function(context) {
       if (foundModules.length < requiredModules.length) {
         var missingModules = requiredModules.filter(
           function(module) {
-            return foundModules.indexOf(module === -1);
+            return foundModules.indexOf(module) === -1;
           }
-          );
+        );
         missingModules.forEach(function(moduleName) {
           context.report(
             node,
             'Mandatory module "{{moduleName}}" must be loaded.',
             { moduleName: moduleName }
-            );
+          );
         });
       }
     }