UserMentionMetadata.fromJson constructor
      
      UserMentionMetadata.fromJson(
    
    
- Map json_
Implementation
UserMentionMetadata.fromJson(core.Map json_)
    : this(
        type: json_.containsKey('type') ? json_['type'] as core.String : null,
        user: json_.containsKey('user')
            ? User.fromJson(
                json_['user'] as core.Map<core.String, core.dynamic>)
            : null,
      );