Function getCountryCodeForRegion

getCountryCodeForRegion(regionCode: string): Promise<number | undefined>
Gets the country calling code for a region.
Parameters
- regionCode: string
  ISO 3166-1 alpha-2 region code (e.g., "DE", "US")
Returns Promise<number | undefined>
The country calling code (e.g., 49, 1) or undefined if unknown
Example
```
await getCountryCodeForRegion("DE")  // 49
await getCountryCodeForRegion("US")  // 1
await getCountryCodeForRegion("GB")  // 44
```
- Defined in region.ts:87