toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (amount != null) 'amount': amount!,
if (description != null) 'description': description!,
if (expectedUnitsPerYear != null)
'expectedUnitsPerYear': expectedUnitsPerYear!,
if (range != null) 'range': range!,
if (type != null) 'type': type!,
if (unit != null) 'unit': unit!,
};