accounts-frontend/packages/app/services/i18n/i18n.ts

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import { IntlShape, createIntl, createIntlCache } from 'react-intl';
import captcha from 'app/services/captcha';
import locales from 'app/i18n';
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import intlPolyfill from './intlPolyfill';
const SUPPORTED_LANGUAGES = Object.keys(locales);
const DEFAULT_LANGUAGE = 'en';
function getBrowserPreferredLanguages(): string[] {
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return []
.concat(
// @ts-ignore
navigator.languages || [],
)
.concat(navigator.language || []);
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}
function detectLanguage(
userLanguages: string[],
availableLanguages: string[],
defaultLanguage: string,
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): string {
return (
userLanguages
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.map(lang => (lang.split('-').shift() || '').toLowerCase())
.find(lang => availableLanguages.indexOf(lang) !== -1) || defaultLanguage
);
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}
const cache = createIntlCache();
let intl: IntlShape;
class I18N {
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detectLanguage(lang: string = ''): string {
return detectLanguage(
[lang].concat(getBrowserPreferredLanguages()).filter(item => !!item),
SUPPORTED_LANGUAGES,
DEFAULT_LANGUAGE,
);
}
getIntl(): IntlShape {
if (!intl) {
intl = createIntl(
{
locale: 'en',
messages: {},
},
cache,
);
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}
return intl;
}
async changeLocale(locale: string = DEFAULT_LANGUAGE): Promise<IntlShape> {
const { messages } = await this.require(locale);
captcha.setLang(locale);
intl = createIntl(
{
locale,
messages,
},
cache,
);
return intl;
}
async ensureIntl() {
await intlPolyfill('en');
}
async require(
locale: string,
): Promise<{
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locale: string;
messages: { [key: string]: string };
}> {
const [{ default: messages }] = await Promise.all([
import(
/* webpackChunkName: "locale-[request]" */ `app/i18n/${locale}.json`
),
intlPolyfill(locale),
]);
return {
locale,
messages,
};
}
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}
export default new I18N();