Function getRegionsForCode

getRegionsForCode(countryCode: number): Promise<readonly string[] | undefined>
Gets all region codes that share a country calling code.
Parameters
- countryCode: number
  The country calling code (e.g., 1, 44)
Returns Promise<readonly string[] | undefined>
Array of region codes or undefined if unknown
Example
```
await getRegionsForCode(1)   // ["US", "CA", "PR", ...]
await getRegionsForCode(44)  // ["GB", "GG", "IM", "JE"]
await getRegionsForCode(49)  // ["DE"]
```
- Defined in region.ts:105