toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (abnfGrammar != null) 'abnfGrammar': abnfGrammar!,
if (customClasses != null) 'customClasses': customClasses!,
if (phraseSetReferences != null)
'phraseSetReferences': phraseSetReferences!,
if (phraseSets != null) 'phraseSets': phraseSets!,
};