diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000000..88dfc81cb1
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,12 @@
+/**
+ * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/* eslint-env node */
+
+'use strict';
+
+module.exports = {
+	extends: 'ckeditor5'
+};
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000000..a95c4fad74
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,31 @@
+sudo: required
+dist: trusty
+addons:
+  firefox: latest
+  apt:
+    sources:
+    - google-chrome
+    packages:
+    - google-chrome-stable
+language: node_js
+node_js:
+- '8'
+cache:
+- node_modules
+branches:
+  except:
+  - stable
+before_install:
+- export DISPLAY=:99.0
+- sh -e /etc/init.d/xvfb start
+- npm config set package-lock false
+- npm i -g npm@^5.7.1
+install:
+- npm install @ckeditor/ckeditor5-dev-tests
+- ckeditor5-dev-tests-install-dependencies
+script:
+- ckeditor5-dev-tests-travis
+env:
+  global:
+  - secure: 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
+  - secure: Ww8ia+iA1REyGQRatUB42jjegFgBozSdvxLMLVKveCarc1p7/hUmurhdZtaNoePwDayAa4fVNaSdTE899mrezpvP0pNK8pwB4+/RplycRMshNh/aDMxyl/Puy3EAEGSUx3x9BxuF8UFWHok5dNzgtxoFWUoMUxJ+0xH/rcQXRGKzYUnFWGBzsyEn5A0k/HV0RLINM4veYWwcl/0JxOIx8cqa+ZRu0VWfnDf84z6Yy/pncXjcm1LZ0PYQ7f89bULUyxRnpSbg09Mx2hV7eZlZQPfEsJB48Ti5veHKA0Xos6180+0MV9Iiu6hkax0mP1H+1tv9Le8nGMViFEQHpo1/Dkkjyg/EvEmkSs4CRVcEBSgAEU4O6T+OJ+djgllGy+bTIDiwAmvijQ1B7SWiN8Qg39KQ8wcJSfK1uFkwE9QT9DhOEDVVLsoEulkshdUw32ANNRglvenuS3mxKNPWXNpIsvliqDvXA4HJ8lH2aJnPH2th+8s4P9nxyqF5nW8U0ee78z4ilRy0vDtJaVm/nhiyghRL9tdCifcsOpeJDrluOURFyWQlp7ltB9Q0/psCMQusyg0mYpnyf9Aai7AAWB1yx4ra97SLRBNEF66DpBx/Gnw4TYKQLyh6VZWHt9Im9MCVoaAqUY3FTLl06sq8d2/DRYoxHEPN1K3Wqol0viktg3g=
diff --git a/package.json b/package.json
index 72d8924d06..1513519a85 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,10 @@
     "@ckeditor/ckeditor5-table": "^11.0.1",
     "@ckeditor/ckeditor5-theme-lark": "^12.0.0",
     "@ckeditor/ckeditor5-upload": "^10.0.4",
+    "eslint": "^5.5.0",
+    "eslint-config-ckeditor5": "^1.0.7",
+    "husky": "^0.14.3",
+    "lint-staged": "^7.0.0",
     "postcss-loader": "^3.0.0",
     "raw-loader": "^1.0.0",
     "style-loader": "^0.23.0",
@@ -66,6 +70,17 @@
   },
   "scripts": {
     "build": "webpack --mode production",
+    "lint": "eslint --quiet '**/*.js'",
+    "precommit": "lint-staged",
     "preversion": "npm run build; if [ -n \"$(git status src/ckeditor.js build/ --porcelain)\" ]; then git add -u src/ckeditor.js build/ && git commit -m 'Internal: Build.'; fi"
-  }
+  },
+  "lint-staged": {
+    "**/*.js": [
+      "eslint --quiet"
+    ]
+  },
+  "eslintIgnore": [
+    "build/**",
+    "packages/**"
+  ]
 }
diff --git a/tests/manual/ckeditor-cjs-version.js b/tests/manual/ckeditor-cjs-version.js
index 9176d5f608..fc4854f164 100644
--- a/tests/manual/ckeditor-cjs-version.js
+++ b/tests/manual/ckeditor-cjs-version.js
@@ -3,6 +3,9 @@
  * For licensing, see LICENSE.md.
  */
 
+/* eslint-env commonjs */
+/* globals window, document, console */
+
 const ClassicEditor = require( '../../build/ckeditor' );
 
 ClassicEditor.create( document.querySelector( '#editor' ) )
diff --git a/tests/manual/ckeditor.js b/tests/manual/ckeditor.js
index bd83687ec8..3f98169188 100644
--- a/tests/manual/ckeditor.js
+++ b/tests/manual/ckeditor.js
@@ -3,6 +3,8 @@
  * For licensing, see LICENSE.md.
  */
 
+/* globals window, document, console */
+
 import ClassicEditor from '../../build/ckeditor';
 
 ClassicEditor.create( document.querySelector( '#editor' ) )