Function underline

underline(text: string): string
Apply underline (SGR 4) to text.
Parameters
- text: string
Returns string
The input wrapped with \u001b[4m … \u001b[24m.
Remarks
Underline is widely supported; disable with SGR 24 or a full reset 0.
Example
```
underline("Link");
```
See
- https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)
- applyAnsiStyle
- Defined in style.ts:39