How can you remove null or empty values with a transformer?

[francoism90]

Does anyone know how to transform a dataobject, but only keep the entries with a filled values?

I've tried to define a global transformer, but it doesn't seem to not accept null as match parameter.

Edit: I just remembered Optional exists (https://spatie.be/docs/laravel-data/v4/as-a-data-transfer-object/optional-properties)..