Function formatPhone

formatPhone(phone: unknown, style?: PhoneFormatStyle): string | null
Formats a Sri Lankan phone number into standard formats.
Parameters
- phone: unknown
  Phone number in any common format.
- style: PhoneFormatStyle = 'national'
  'national' (default), 'international', 'e164', or 'rfc3966' (a tel: URI).
Returns string | null
The formatted number, or null if the input is invalid.
Example
```
formatPhone('0771234567'); // '077 123 4567'
formatPhone('0771234567', 'international'); // '+94 77 123 4567'
formatPhone('0771234567', 'e164'); // '+94771234567'
formatPhone('0771234567', 'rfc3966'); // 'tel:+94-77-123-4567'
```
- Defined in phone/formatter.ts:21