import type { i18n as I18nInstance } from 'i18next';
/**
 * Keeps the package-owned i18n instance (`defaultI18n`) aligned with the
 * optional host i18n instance.
 *
 * The package always renders its own translations through `defaultI18n` so
 * that host-side plugins (for example `i18next-icu`) cannot reinterpret the
 * package's `{{var}}` interpolation syntax. When a host i18n instance is
 * provided we still:
 *   - mirror the host language onto `defaultI18n` (initial value + future
 *     `languageChanged` events), and
 *   - register the package resource bundle on the host instance, so callers
 *     of `host.t('rdiPipeline:...')` keep working for inspection/overrides.
 *
 * @param hostI18n - The i18next instance from the host application (optional).
 */
export declare const useI18nSetup: (hostI18n: I18nInstance | undefined) => void;