Updated package.json & added various config files.

.editorconfig

@@ -0,0 +1,19 @@
+# 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
+
+[*.{js,jsx,ts}]
+quote_type = single
+
+[package.json]
+indent_style = space
+tab_width = 2

.eslintrc.js

@@ -0,0 +1,25 @@
+/* eslint-env node */
+
+'use strict';
+
+module.exports = {
+	extends: 'ckeditor5',
+	root: true,
+	rules: {
+		// This rule disallows importing core DLL packages directly. Imports should be done using the `ckeditor5` package.
+		// Also, importing non-DLL packages is not allowed. If the package requires other features to work, they should be
+		// specified as soft-requirements.
+		// Read more: https://ckeditor.com/docs/ckeditor5/latest/builds/guides/migration/migration-to-26.html#soft-requirements.
+		'ckeditor5-rules/ckeditor-imports': 'error'
+	},
+	overrides: [
+		{
+			files: [ 'tests/**/*.js', 'sample/**/*.js' ],
+			rules: {
+				// To write complex tests, you may need to import files that are not exported in DLL files by default.
+				// Hence, imports CKEditor 5 packages in test files are not checked.
+				'ckeditor5-rules/ckeditor-imports': 'off'
+			}
+		}
+	]
+};

.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

.gitignore

@@ -0,0 +1,7 @@
+.nyc_output/
+coverage/
+node_modules/
+yarn.lock
+tmp/
+build/
+yarn.error

.stylelintrc

@@ -0,0 +1,3 @@
+{
+	"extends": "stylelint-config-ckeditor5"
+}

package.json

@@ -47,10 +47,41 @@
     "@ckeditor/ckeditor5-typing": "^32.0.0",
     "@ckeditor/ckeditor5-undo": "^32.0.0",
     "@ckeditor/ckeditor5-widget": "^32.0.0",
+    "@ckeditor/ckeditor5-package-tools": "^1.0.0-beta.4",
+    "@ckeditor/ckeditor5-theme-lark": ">=32.0.0",
     "eslint": "^7.32.0",
-    "eslint-config-ckeditor5": ">=3.1.1"
+    "eslint-config-ckeditor5": ">=3.1.1",
+    "http-server": "^14.1.0",
+    "husky": "^4.2.5",
+    "lint-staged": "^10.2.6",
+    "stylelint": "^13.13.1",
+    "stylelint-config-ckeditor5": ">=2.0.1"
   },
+
   "scripts": {
-    "dll:build": "webpack"
+    "dll:build": "ckeditor5-package-tools dll:build",
+    "dll:serve": "http-server ./ -o sample/dll.html",
+    "lint": "eslint \"**/*.js\" --quiet --ignore-pattern \"build/\"",
+    "start": "ckeditor5-package-tools start",
+    "stylelint": "stylelint --quiet --allow-empty-input 'theme/*.css'",
+    "test": "ckeditor5-package-tools test",
+    "prepare": "yarn run dll:build",
+    "prepublishOnly": "yarn run dll:build",
+    "translations:collect": "ckeditor5-package-tools translations:collect",
+    "translations:download": "ckeditor5-package-tools translations:download",
+    "translations:upload": "ckeditor5-package-tools translations:upload"
+  },
+  "lint-staged": {
+    "**/*.js": [
+      "eslint --quiet"
+    ],
+    "**/*.css": [
+      "stylelint --quiet --allow-empty-input"
+    ]
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
   }
 }