Function hslToHex

hslToHex(hsl?): string | undefined
Returns the converted hex color from the given hsl color
Parameters
- Optionalhsl: string | [h: number, s: number, l: number]
  the hsl color to inspect
Returns string | undefined
the converted hex color from the given hsl color
Example
```
hslToHex('hsl(360, 1, 0.5)');    // '#ff0000'
hslToHex([360, 1, 0.5]);    // '#ff0000'
```