diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 00000000..88dfc81c
--- /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 00000000..953bba36
--- /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: L9nm/YgvQ7e9LRBr2vvNBFJcLBPn0jcs6S+EqlIDVwrKYli7xD4lD9n4xtkyahKHnSdxG9zwwAmGj3o5efbF+khPx84byNiBO+TcpxPy6lWE0KH5GJrtKF+Xyvo3Iwlb417d1qka0yWqbM8yD8y1njADa9v22YnsKeMOLvrqKKO4VwNWI9YcaVRWJeJa6WvVzmskFwkwYZ7T36CtYCR5xFYYTiWtpd/DoDa14U1Xc3W0r66WI3Ck50RxY0CvTe4gw4YGT7RKiGMgBAiyLOPZePb2ttK1mF545Ko9v8rsFX5fJUfChfp8loMrM40JPyGfjWPhA5z5se8tuvD2L+WikBb3oxPVcnFqLfbYDh4DOoTHpX1TJu5xMR5M4tv9kdNO19lZmPOZL9V9CSPKx5riSSUGqTg6XuWR6JmXjUp9GBmpm0RVYLSAvvbOdumN9WEXvFrt5cB9y8WQCKtOu5EUVkYCfoIkYWLNBboOIlI2GHpvF8/XECMDTjRPm6TMTJpPxl3WaB1BvbU4IHEWIb+G2Oy7LDXW5j40BwOsMqNh0LRG1QuadtHnWqn2464RFOzTwZPN3VUUqybWL6X4+L4wML0htcuy8UuGEPeuD27/hMfkDZwDgCffwvGLtvuGFPAJ5iC/WSrVSvSmZ6HqO6nZ9EH3V648PgWWyfvh2sHQ+t0=
diff --git a/package.json b/package.json
index e870750a..630e4efe 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 60221c75..f3bdbe6a 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 BalloonEditor = require( '../../build/ckeditor' );
 
 BalloonEditor.create( document.querySelector( '#editor' ) )
diff --git a/tests/manual/ckeditor.js b/tests/manual/ckeditor.js
index a0500155..c47e2755 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 BalloonEditor from '../../build/ckeditor';
 
 BalloonEditor.create( document.querySelector( '#editor' ) )