$ObjectId.fromJson constructor
      
      $ObjectId.fromJson(
    
    
- Map json_
Implementation
$ObjectId.fromJson(core.Map json_)
  : this(
      bucketName: json_['bucketName'] as core.String?,
      generation: json_['generation'] as core.String?,
      objectName: json_['objectName'] as core.String?,
    );