---
title: optionEmpty
description: Unknown option or option having default value
---
## Constructor: optionEmpty  
[Back to constructors index](index.md)



Unknown option or option having default value

### Attributes:

| Name     |    Type       | Required | Description |
|----------|:-------------:|:--------:|------------:|



### Type: [OptionValue](../types/OptionValue.md)


### Example:

```
$optionEmpty = ['_' => 'optionEmpty', ];
```  

Or, if you're into Lua:  


```
optionEmpty={_='optionEmpty', }

```