toJson method
Convert to JSON.
Implementation
Map<String, dynamic> toJson() {
return {
if (contentHash != null) 'contentHash': contentHash!.toJson(),
if (files.isNotEmpty) 'files': files.map((f) => f.toJson()).toList(),
if (signatures.isNotEmpty)
'signatures': signatures.map((s) => s.toJson()).toList(),
if (computedAt != null) 'computedAt': computedAt!.toIso8601String(),
};
}