I found my old code, not sure if it works today (didn’t check).
import { withPluginApi } from 'discourse/lib/plugin-api';
import RawHtml from 'discourse/widgets/raw-html';
function attachComm(api) {
api.addPostClassesCallback((attrs) => {
return attrs.user_deleted ? ["remote"] : ["rated"];
});
}
export default {
name: 'alert',
initialize(container) {
withPluginApi('0.1', attachComm);
}
};
It was part of the plugin. Perhaps something similar can be done by a component.