zod-backend/src/common/mappers/numeric-to-iso.mapper.ts

import { CountriesNumericISO } from '../constants';
import { CountryIso } from '../enums';

// At module top-level
export const NumericToCountryIso: Record<string, CountryIso> = Object.entries(CountriesNumericISO).reduce(
  (acc, [isoKey, numeric]) => {
    acc[numeric] = isoKey as CountryIso;
    return acc;
  },
  {} as Record<string, CountryIso>,
);