Index: Gruntfile.js
===================================================================
--- Gruntfile.js	(revision 40877)
+++ Gruntfile.js	(working copy)
@@ -292,6 +292,59 @@
 				src: []
 			}
 		},
+		eslint: {
+			grunt: {
+				options: {
+					configFile: 'node_modules/eslint-config-wordpress/index.js'
+				},
+				src: ['Gruntfile.js']
+			},
+			jshint: {
+				options: {
+					configFile: 'node_modules/eslint-config-wordpress/index.js'
+				},
+				cwd: SOURCE_DIR,
+				src: [
+					'wp-admin/js/*.js',
+					'wp-includes/js/*.js',
+					// Built scripts.
+					'!wp-includes/js/media-*',
+					// WordPress scripts inside directories
+					'wp-includes/js/jquery/jquery.table-hotkeys.js',
+					'wp-includes/js/mediaelement/wp-mediaelement.js',
+					'wp-includes/js/mediaelement/wp-playlist.js',
+					'wp-includes/js/plupload/handlers.js',
+					'wp-includes/js/plupload/wp-plupload.js',
+					'wp-includes/js/tinymce/plugins/wordpress/plugin.js',
+					'wp-includes/js/tinymce/plugins/wp*/plugin.js',
+					// Third party scripts
+					'!wp-admin/js/farbtastic.js',
+					'!wp-includes/js/backbone*.js',
+					'!wp-includes/js/swfobject.js',
+					'!wp-includes/js/underscore*.js',
+					'!wp-includes/js/colorpicker.js',
+					'!wp-includes/js/hoverIntent.js',
+					'!wp-includes/js/json2.js',
+					'!wp-includes/js/tw-sack.js',
+					'!wp-includes/js/twemoji.js',
+					'!**/*.min.js'
+				]
+			},
+			themes: {
+				options: {
+					configFile: 'node_modules/eslint-config-wordpress/index.js'
+				},
+				expand: true,
+				cwd: SOURCE_DIR + 'wp-content/themes',
+				src: [
+					'twenty*/**/*.js',
+					'!twenty{eleven,twelve,thirteen}/**',
+					// Third party scripts
+					'!twenty{fourteen,fifteen,sixteen,seventeen}/**/html5.js',
+					'!twentyseventeen/assets/js/jquery.scrollTo.js'
+				]
+			}
+		},
 		jshint: {
 			options: grunt.file.readJSON('.jshintrc'),
 			grunt: {
Index: package.json
===================================================================
--- package.json	(revision 40877)
+++ package.json	(working copy)
@@ -13,6 +13,8 @@
   "license": "GPL-2.0+",
   "devDependencies": {
     "autoprefixer": "^6.5.1",
+    "eslint": "~3.19.0",
+    "eslint-config-wordpress": "~1.0.0",
     "grunt": "~0.4.5",
     "grunt-browserify": "~5.0.0",
     "grunt-contrib-clean": "~1.0.0",
@@ -25,6 +27,7 @@
     "grunt-contrib-qunit": "^1.2.0",
     "grunt-contrib-uglify": "~2.0.0",
     "grunt-contrib-watch": "~1.0.0",
+    "grunt-eslint": "~19.0.0",
     "grunt-includes": "~0.5.1",
     "grunt-jsvalidate": "~0.2.2",
     "grunt-legacy-util": "^0.2.0",