PingMessage.fromJson constructor
Create a ping message from a JSON map
Implementation
factory PingMessage.fromJson(Map<String, dynamic> json) {
return PingMessage(
timestamp: json['timestamp'] as int,
documentId: json['documentId'] as String,
versionVector: json['versionVector'] != null
? _decodeVersionVector(json['versionVector'] as String)
: null,
);
}