diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 000000000..ab5fd231e
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,16 @@
+# Configurations to normalize the IDE behavior.
+# http://editorconfig.org/
+
+root = true
+
+[*]
+indent_style = tab
+tab_width = 4
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[package.json]
+indent_style = space
+tab_width = 2
diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 000000000..60f819d77
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,12 @@
+/**
+ * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
+ */
+
+/* eslint-env node */
+
+'use strict';
+
+module.exports = {
+	extends: 'ckeditor5'
+};
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..9c20d56f7
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,18 @@
+*			text=auto
+
+*.htaccess	eol=lf
+*.cgi		eol=lf
+*.sh		eol=lf
+
+*.css		text
+*.htm		text
+*.html		text
+*.js		text
+*.json		text
+*.php		text
+*.txt		text
+*.md		text
+
+*.png		-text
+*.gif		-text
+*.jpg		-text
diff --git a/.stylelintrc b/.stylelintrc
new file mode 100644
index 000000000..1d86a41f9
--- /dev/null
+++ b/.stylelintrc
@@ -0,0 +1,3 @@
+{
+	"extends": "stylelint-config-ckeditor5"
+}