Obtain a document record without create a firebase record

Hi i am in troubles, i have test in a sort of many ways to create a record ( a string map ) with all the attributes that a doocument has and then creating a recordData making a cast to map into json i am using this functions, i have a question where i can see all the methods documentation of createRegistriprimaRecordData to see what it returns and understand if i am doing whell or no

//some elaborations to obtain the record 
final jsObject = js.JsObject.jsify(dati);
return createRegistriprimaRecordData.toJS(jsObject);