ns: ['common', 'moduleA', 'moduleB'],
i18next.t('myKey'); // key in moduleA namespace (defined default)
i18next.t('common:myKey'); // key in common namespace (not recommended with ns prefix when used in combination with natural language keys)
// better use the ns option:
i18next.t('myKey', { ns: 'common' });
// load additional namespaces after initialization
i18next.loadNamespaces('anotherNamespace', (err, t) => { /* ... */ });