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<a name="module_to-property-key-x"></a>

## to-property-key-x
Converts argument to a value that can be used as a property key.

**Version**: 2.0.2  
**Author**: Xotic750 <Xotic750@gmail.com>  
**License**: [MIT](&lt;https://opensource.org/licenses/MIT&gt;)  
**Copyright**: Xotic750  
<a name="exp_module_to-property-key-x--module.exports"></a>

### `module.exports(argument)` ⇒ <code>string</code> \| <code>symbol</code> ⏏
This method Converts argument to a value that can be used as a property key.

**Kind**: Exported function  
**Returns**: <code>string</code> \| <code>symbol</code> - The converted argument.  
**Throws**:

- <code>TypeError</code> If argument is not a symbol and is not coercible to a string.


| Param | Type | Description |
| --- | --- | --- |
| argument | <code>\*</code> | The argument to onvert to a property key. |

**Example**  
```js
var toPropertyKey = require('to-property-key-x');

toPropertyKey(); // 'undefined'
toPropertyKey(1); // '1'
toPropertyKey(true); // 'true'

var symbol = Symbol('a');
toPropertyKey(symbol); // symbol

toPropertyKey(Object.create(null)); // TypeError
```