Infers the best valid locale for a given language/country combination.
Sometimes the locale is simply the language/country combination, e.g. en + US = en_US.
However, it + FR ≠ it_FR (as it is not a valid locale). A better option is the valid it_IT.
Install the library with npm install locale-helpers
var LocaleHelpers = require('locale-helpers').LocaleHelpers;
LocaleHelpers.bestLocaleFor({language: 'en', country: 'US'}); //-> 'en_US'
LocaleHelpers.bestLocaleFor({language: 'fr', country: 'FR'}); //-> 'fr_FR'
LocaleHelpers.bestLocaleFor({language: 'en', country: 'GB'}); //-> 'en_GB'
LocaleHelpers.bestLocaleFor({language: 'it', country: 'FR'}); //-> 'it_IT'
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