$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?,
      );