ESLint configuration moved to JSON file. Changed default task mode.

Author: Igloczek

dev/tools/grunt/configs/eslint.js

@@ -0,0 +1,18 @@
+{
+    "file": {
+        "options": {
+            "configFile": "dev/tests/static/testsuite/Magento/Test/Js/_files/eslint/.eslintrc",
+            "reset": true,
+            "useEslintrc": false
+        }
+    },
+    "test": {
+        "options": {
+            "configFile": "dev/tests/static/testsuite/Magento/Test/Js/_files/eslint/.eslintrc",
+            "reset": true,
+            "outputFile": "dev/tests/static/eslint-error-report.xml",
+            "format": "junit",
+            "quiet": true
+        }
+    }
+}

dev/tools/grunt/configs/eslint.json

@@ -17,7 +17,7 @@ module.exports = function (grunt) {
         };
 
     grunt.registerTask('static', function (target) {
-        var currentTarget = target || 'test',
+        var currentTarget = target || 'file',
             file = grunt.option('file'),
             tasks = [
                 'eslint:' + currentTarget,