i18next react with traduora

setupi18n.ts

export async function setupI18n(config: {
    traduora: {
        host: string,
        projectId: string,
        clientId: string,
        clientSecret: string
    }
}) {

    const token = await getTraduoraToken(config.traduora);

    return i18n
        // load translation using xhr -> see /public/locales (i.e. https://github.com/i18next/react-i18next/tree/master/example/react/public/locales)
        // learn more: https://github.com/i18next/i18next-xhr-backend
        .use(Backend)
        // detect user language
        // learn more: https://github.com/i18next/i18next-browser-languageDetector
        .use(LanguageDetector)
        // pass the i18n instance to react-i18next.
        .use(initReactI18next)
        // init i18next
        // for all options read: https://www.i18next.com/overview/configuration-options
        .init({
            fallbackLng: 'en',
            debug: false,

            backend: {
                loadPath: `${config.traduora.host}/api/v1/projects/${config.traduora.projectId}/exports?locale={{lng}}&format=jsonflat`,
                customHeaders: {
                    "Accept": "application/octet-stream",
                    "Authorization": `Bearer ${token}`
                }
            }
        });
}

async function getTraduoraToken(params: { host: string, clientId: string, clientSecret: string }) {

    const response = await fetch(`${params.host}/api/v1/auth/token`, {
        method: 'POST',
        headers: {
            "Accept": "application/json",
            "Content-Type": "application/json"
        },
        body: JSON.stringify({
            grant_type: 'client_credentials',
            client_id: params.clientId,
            client_secret: params.clientSecret})
    });
    if (response.ok) {
        const asJson: { access_token: string } = await response.json();
        return asJson.access_token;
    }
    console.warn(response);
    throw new Error("Can't get traduora token");
}