Can't get plugin content type to show up

Are you sure this is necessary? It doesn’t seem to be an issue for my notification content-type to export like

'use strict';
const pushkey = require('./pushkey');

module.exports = {
  "notification": require('./notification'),
  "pushkey": { schema: pushkey }
};```

Not sure if its a step in the right direction, but the above gives the error

```│   TypeError: Cannot read properties of undefined (reading 'singularName')    ││   at validateKeySameToSingularName (```