MessageContent.fromJson constructor
Creates a MessageContent from JSON.
Implementation
factory MessageContent.fromJson(Map<String, dynamic> json) {
final type = json['type'] as String;
return switch (type) {
'text' => TextMessageContent.fromJson(json),
'image_url' => ImageUrlMessageContent.fromJson(json),
'image_file' => ImageFileMessageContent.fromJson(json),
'refusal' => RefusalMessageContent.fromJson(json),
_ => throw FormatException('Unknown content type: $type'),
};
}