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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { importIntl, extractIntlLocaleData } from './import';
import cookie from './cookie';
import locales from './locales';
import { normalizeLocale, getLanguageCodeFromLocale, getNavigatorLocale } from './utils';
&nbsp;
/**
 * Get a locale for the user that is supported
 *
 * It considers normalized locales from
 * - the cookie (first full locale, then extracted language)
 * - the navigator locale (first full, then extracted language)
 * - default: 'en'
 *
 * and returns the first match in the normalized supported locales
 *
 * @param {string[]} supportedLocales
 * @returns {string} normalized locale which is supported (or 'en')
 */
export const getLocale = supportedLocales =&gt; {
  const cookieLocale = normalizeLocale(cookie.get('locale'));
  const navigatorLocale = normalizeLocale(getNavigatorLocale());
  const normalizedSuppportedLocales = supportedLocales.map(locale =&gt; normalizeLocale(locale));
&nbsp;
  const desiredLocales = [
    cookieLocale,
    getLanguageCodeFromLocale(cookieLocale),
    navigatorLocale,
    getLanguageCodeFromLocale(navigatorLocale),
    'en',
  ];
&nbsp;
  const matchedLocale = desiredLocales.reduce((result, desiredLocale) =&gt; {
    if (!result &amp;&amp; normalizedSuppportedLocales.includes(desiredLocale)) {
      return desiredLocale;
    }
&nbsp;
    return result;
  }, false);
&nbsp;
  return matchedLocale || <span class="branch-1 cbranch-no" title="branch not covered" >'en';</span>
};
&nbsp;
/**
 * Initialise I18n asynchronously
 * - determine locale
 * - load Intl polyfill (only executed when window.Intl is not present)
 * - load `react-intl` locale data if not english locale
 * - load translation messages if not english
 *
 * It returns a promise that will always resolve: errors are caught internally, and a default language is returned
 *
 * @async
 * @returns {Promise&lt;object&gt;} Resolves to an object with locale, locale data (optional) and translation messages (optional)
 */
export default async function <span class="fstat-no" title="function not covered" >initI18n(</span>{ supportedLocales = <span class="branch-0 cbranch-no" title="branch not covered" >Object.keys(locales),</span> loadLocaleFiles } = <span class="branch-0 cbranch-no" title="branch not covered" >{})</span> {
<span class="cstat-no" title="statement not covered" >  try {</span>
    const locale = <span class="cstat-no" title="statement not covered" >getLocale(supportedLocales);</span>
&nbsp;
    let imports = <span class="cstat-no" title="statement not covered" >[importIntl()];</span>
<span class="cstat-no" title="statement not covered" >    if (locale !== 'en') {</span>
      const normalizedLocale = <span class="cstat-no" title="statement not covered" >normalizeLocale(locale);</span>
      const [language] = <span class="cstat-no" title="statement not covered" >normalizedLocale.split('-');</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >      imports = imports.concat(loadLocaleFiles(normalizedLocale, language));</span>
    }
&nbsp;
    const [, data] = <span class="cstat-no" title="statement not covered" >await Promise.all(imports);</span>
    const [reactLocaleData, messages] = <span class="cstat-no" title="statement not covered" >data;</span>
    const localeData = <span class="cstat-no" title="statement not covered" >extractIntlLocaleData(reactLocaleData, locale);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    return {</span>
      locale,
      localeData,
      messages,
    };
  } catch (error) {
<span class="cstat-no" title="statement not covered" >    return {</span>
      locale: 'en',
    };
  }
}
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