Based on the CKEditor 5 plugin development starter template.
Plugin source should be added to
js/ckeditor5_plugins/{pluginNameDirectory}/src and the build tools expect this
directory to include an index.js file that exports one or more CKEditor 5
plugins. Note that requiring index.js to be inside
{pluginNameDirectory}/src is not a fixed requirement of CKEditor 5 or Drupal,
and can be changed in webpack.config.js as needed.
In the module directory, run npm install to set up the necessary assets. The
initial run of install may take a few minutes, but subsequent builds will be
faster.
After installing dependencies, plugins can be built with npm run build or npm run watch. They will be built to js/build/{pluginNameDirectory}.js. co