Ckeditor component

Install js library

yarn add ckeditor4

Add entry on webpack.config.js :

Encore
    .addEntry('ckeditor', './vendor/umbrella2/corebundle/assets/ckeditor/ckeditor.js')

Rebuild javascripts with yarn and copy vendor on public/ directory

yarn build
cp -R node_modules/ckeditor4 public

You can now use CkeditorTypeon your symfony form :)