Testing data or rules 5

countryConfiguration.ts

//hard-coded data giving by business (probably) to "play safe"
const defaultConfiguration = {
    alcohol: 21,
    softDrugs: Infinity,
    hardDrugs: Infinity,
    drive: 21,
    adult: 21
}

// ts-magic, creates an interface-like type definition
// it uses a value as template, infering the types correctly
type Configuration = typeof defaultConfiguration

export const async getCountryConfiguration = (
  country: Country
): Configuration => {
  //try-catch is on the service
  const record: Configuration = await service.getCountryConfiguration(country)
  
  return {
    ...defaultConfiguration,
    ...record
  }
}