toJson method
Implementation
@visibleForTesting
Map<String, dynamic> toJson() => {
      "crop": crop?.toJson(),
      "backgroundColor": _intFromColor(backgroundColor),
    }.clearNulls();@visibleForTesting
Map<String, dynamic> toJson() => {
      "crop": crop?.toJson(),
      "backgroundColor": _intFromColor(backgroundColor),
    }.clearNulls();