/**
 * Resolves the device's current language as a BCP-47 tag (e.g. `en-US`).
 * This is the React Native equivalent of the web SDK's `navigator.language`,
 * used to expand `settings.language: 'system'` into a concrete tag before it
 * is sent to the hosted Link UI (the UI expects a real tag, not `'system'`).
 *
 * The native settings modules are read first because they reflect the real
 * device language on every JS engine. `Intl` is only a fallback: on Hermes
 * builds without full ICU (and on JSC) it can report a fixed `en-US` rather
 * than the device locale, so trusting it first would silently force English
 * for non-English users.
 *
 * Returns `undefined` when no locale can be determined so callers can apply
 * their own fallback.
 */
export declare function getSystemLanguage(): string | undefined;
/**
 * Resolves a `settings.language` value into the concrete tag to send as `lng`.
 * `'system'` expands to the device locale (falling back to `'en'` when it
 * cannot be determined); any other value is passed through unchanged, and
 * `undefined` stays `undefined` so no `lng` param is added.
 */
export declare function resolveLanguage(language: string | undefined): string | undefined;