diff --git a/Gruntfile.js b/Gruntfile.js
index e09a4f9..b6aaa40 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,5 +1,5 @@
+'use strict';
 module.exports = function (grunt) {
-    'use strict';
     grunt.initConfig({
         clean: {
             main: {
@@ -9,7 +9,8 @@ module.exports = function (grunt) {
         eslint: {
             all: {
                 src: [
-                    'src/**/*.js'
+                    'src/**/*.js', 'playground/**/*.js',
+                    '!playground/main.browser.js'
                 ]
             },
             teamcity: {
@@ -48,6 +49,7 @@ module.exports = function (grunt) {
     });
 
     grunt.loadNpmTasks('grunt-browserify');
+    grunt.loadNpmTasks('grunt-eslint');
 
     grunt.registerTask('default', ['eslint', 'build_sources', 'check', 'build']);
     grunt.registerTask('test', ['jasmine_node']);
diff --git a/package.json b/package.json
index a1b92df..571c89f 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "codemirror": "^4.7.0",
     "grunt": "^0.4.5",
     "grunt-browserify": "^3.2.0",
+    "grunt-eslint": "^2.0.0",
     "tape": "^3.0.2"
   }
 }
diff --git a/playground/main.js b/playground/main.js
index 42e0afb..cc5dcdf 100644
--- a/playground/main.js
+++ b/playground/main.js
@@ -1,3 +1,5 @@
+'use strict';
+/*eslint-env browser*/
 var reactTemplates = require('../src/reactTemplates');
 var playgroundTemplate = require('./playground.rt.js');
 var htmlMode = require('codemirror/mode/htmlmixed/htmlmixed');
@@ -11,7 +13,7 @@ var React = require('react/addons');
 var _ = require('lodash');
 
 
-var html = "<div>hello</div>";
+var html = '<div>hello</div>';
 var res = reactTemplates.convertTemplateToReact(html.trim());
 console.log(res);
 
@@ -22,7 +24,7 @@ function emptyFunc() {
 function generateTemplateSource(html) {
     var code = null;
     try {
-        code = reactTemplates.convertTemplateToReact(html.trim().replace(/\r/g, ""));
+        code = reactTemplates.convertTemplateToReact(html.trim().replace(/\r/g, ''));
     } catch (e) {
     }
     return code;
@@ -30,17 +32,18 @@ function generateTemplateSource(html) {
 
 function generateTemplateFunction(code) {
     try {
-        var defineMap = {"react":React,"lodash":_};
-        var define = function (requirementsNames,content) {
+        var defineMap = {react: React, lodash: _};
+        var define = function (requirementsNames, content) {
             var requirements = _.map(requirementsNames,function (reqName) {
                 return defineMap[reqName];
             });
             return content.apply(this,requirements);
         };
+        /*eslint no-eval:0*/
         var res = eval(code);
         return res;
     } catch (e) {
-        return emptyFunc
+        return emptyFunc;
     }
 }
 
@@ -48,17 +51,17 @@ function generateRenderFunc(renderFunc) {
     return function() {
         var res = null;
         try {
-            res = renderFunc.apply(this)
+            res = renderFunc.apply(this);
         } catch (e) {
-            res = React.DOM.div.apply(this,[{style:{color:"red"}},"Exception:"+e.message]);
+            res = React.DOM.div.apply(this, [{style: {color: 'red'}}, 'Exception:' + e.message]);
         }
         return React.DOM.div.apply(this, _.flatten([
-            {key:"result"},
+            {key: 'result'},
             res
         ]));
-    }
+    };
 }
-var z = {getInitialState: function() {return {name:"reactTemplates"}}};
+var z = {getInitialState: function() {return {name: 'reactTemplates'};}};
 var templateHTML = "<div>\n    Have {_.filter(this.state.todos, {done:true}).length} todos done,\n    and {_.filter(this.state.todos, {done:false}).length} not done\n    <br/>\n    <div rt-repeat=\"todo in this.state.todos\" key=\"{todo.key}\">\n        <button onClick=\"(e)=>e.preventDefault(); this.remove(todo)\">x</button>\n        <input type=\"checkbox\" checked=\"{todo.done}\" onChange=\"()=>this.toggleChecked(todoIndex)\"/>\n        <span style=\"text-decoration: {todo.done ? 'line-through': 'none'}\">{todo.value}</span>\n    </div>\n    <input key=\"myinput\" type=\"text\" onKeyDown=\"(e) => if (e.keyCode == 13) { this.add(); }\" valueLink=\"{this.linkState('edited')}\"/>\n    <button onClick=\"(e)=>e.preventDefault(); this.add()\" >Add</button><br/>\n    <button onClick=\"(e)=>e.preventDefault(); this.clearDone()\">Clear done</button>\n</div>";
 var templateProps = "{\n    mixins: [React.addons.LinkedStateMixin],\n    getInitialState: function () {\n        return {edited: '', todos: [], counter: 0};\n    },\n    add: function () {\n    if (this.state.edited.trim().length === 0) {\n        return;\n    }\n        var newTodo = {value: this.state.edited, done: false, key: this.state.counter};\n        this.setState({todos: this.state.todos.concat(newTodo), edited: '', counter: this.state.counter + 1});\n    },\n    remove: function (todo) {\n        this.setState({todos: _.reject(this.state.todos, todo)});\n    },\n    toggleChecked: function (index) {\n        var todos = _.cloneDeep(this.state.todos);\n        todos[index].done = !todos[index].done;\n        this.setState({todos: todos});\n    },\n    clearDone: function () {\n        this.setState({todos: _.filter(this.state.todos, {done: false})});\n    }\n}";
 
@@ -76,9 +79,9 @@ var Playground = React.createClass({
         try {
             this.validProps = true;
             console.log(state.templateProps);
-            classBase = eval("("+state.templateProps+")");
+            classBase = eval('(' + state.templateProps + ')');
             if (!_.isObject(classBase)) {
-                throw "failed to eval";
+                throw 'failed to eval';
             }
         } catch (e) {
             classBase = {};
@@ -91,13 +94,13 @@ var Playground = React.createClass({
 
     getInitialState: function () {
         var currentState = {
-            templateHTML:templateHTML,
+            templateHTML: templateHTML,
             templateProps: templateProps
         };
         this.updateSample(currentState);
         return currentState;
     },
-    componentWillUpdate: function (nextProps,nextState) {
+    componentWillUpdate: function (nextProps, nextState) {
         if (nextState.templateHTML !== this.state.templateHTML || nextState.templateProps !== this.state.templateProps) {
             this.updateSample(nextState);
         }
@@ -108,4 +111,4 @@ var Playground = React.createClass({
     }
 });
 
-React.render(Playground(),document.getElementById('playground'));
+React.render(Playground(), document.getElementById('playground'));
diff --git a/src/reactTemplates.js b/src/reactTemplates.js
index f79e4ae..7e4e0c5 100644
--- a/src/reactTemplates.js
+++ b/src/reactTemplates.js
@@ -246,6 +246,7 @@ function extractDefinesFromJSXTag(html, defines) {
         var match = true;
         while (match) {
             match = false;
+            /*eslint no-loop-func:0*/
             reqStr = reqStr.replace(/\s*(\w+)\s*\=\s*\"([^\"]*)\"\s*/, function(full, varName, reqPath) {
                 defines[reqPath] = varName;
                 match = true;
@@ -259,7 +260,7 @@ function extractDefinesFromJSXTag(html, defines) {
 
 /**
  * @param {string} html
- * @param {{commonJS:boolean}} options
+ * @param {{commonJS:boolean}?} options
  * @return {string}
  */
 function convertTemplateToReact(html, options) {