never_conditionals.ts

type Locations = 'Zurich' | 'Warsaw' | 'London';

function getCountryLocation(location: Locations) {
  switch (location) {
    case 'Zurich':
      return 'Switzerland';
    case 'Warsaw':
      return 'Poland';
    case 'London':
      return 'UK';
    default:
      // const _exhaustiveCheck: never = location;
      throw new Error(`Invalid ${location satisfies never}`);
  }
}

getCountryLocation('Zurich');
getCountryLocation('Paris');