toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (kind != null) 'kind': kind!,
if (level != null) 'level': level!,
if (maxExperiencePoints != null)
'maxExperiencePoints': maxExperiencePoints!,
if (minExperiencePoints != null)
'minExperiencePoints': minExperiencePoints!,
};