Function truncate

truncate(str: string, maxLength: number, ellipsis?: string): string
Truncates a string to a specified length and adds an ellipsis if truncated
Parameters
- str: string
  The string to truncate
- maxLength: number
  Maximum length of the string (including ellipsis)
- ellipsis: string = '...'
  The ellipsis string to append (default: '...')
Returns string
The truncated string
Example
```
truncate('Hello World', 8); // 'Hello...'
truncate('Hello World', 20); // 'Hello World'
truncate('Hello World', 8, '…'); // 'Hello …'
```
- Defined in string/truncate.ts:18