Creo MyEvent:

 import EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin'; import mix from '@ckeditor/ckeditor5-utils/src/mix'; export default class MyEvent { } mix( MyEvent, EmitterMixin );

En mi complemento personalizado escribí:

 (new MyEvent).fire('my-super-event', { ...someData, })

Suscríbete a mi evento:

 editor.on('my-super-event', event => { console.log('My event: ', event); });

Pero no pasa nada, ¿por qué?