toJson method
Implementation
Map<String, dynamic> toJson() => {
if (width != null) 'width': width,
if (height != null) 'height': height,
if (maxWidth != null) 'max_width': maxWidth,
if (maxHeight != null) 'max_height': maxHeight,
'expand': expand,
if (aspectRatio != null) 'aspect_ratio': aspectRatio,
};