my-links/inertia/components/lang_selector.tsx

import dayjs from 'dayjs';
import { useTranslation } from 'react-i18next';
import Selector from '~/components/common/form/selector';
import { LS_LANG_KEY } from '~/constants';
import { languages } from '~/i18n';

type Country = 'fr' | 'en';

export default function LangSelector({
  onSelected,
}: {
  onSelected?: (country: Country) => void;
}) {
  const { t, i18n } = useTranslation('common');

  const onToggleLanguageClick = (newLocale: string) => {
    dayjs.locale(newLocale);
    i18n.changeLanguage(newLocale);
    localStorage.setItem(LS_LANG_KEY, newLocale);
  };

  return (
    <Selector
      name="lng-select"
      label={t('select-your-lang')}
      value={i18n.language}
      onChangeCallback={(value) => {
        onToggleLanguageClick(value.toString());
        if (onSelected) {
          setTimeout(() => onSelected(value.toString() as Country), 150);
        }
      }}
      options={languages.map((lang: Country) => ({
        label: t(`language.${lang}`),
        value: lang,
      }))}
      formatOptionLabel={(country) => (
        <div
          className="country-option"
          style={{ display: 'flex', gap: '.5em', alignItems: 'center' }}
        >
          <img
            src={`/icons/${country.value}.svg`}
            alt="country-image"
            height={24}
            width={24}
          />
          <span>{country.label}</span>
        </div>
      )}
    />
  );
}