toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (body != null) 'body': body!,
if (filename != null) 'filename': filename!,
if (headers != null) 'headers': headers!,
if (mimeType != null) 'mimeType': mimeType!,
if (partId != null) 'partId': partId!,
if (parts != null) 'parts': parts!,
};