/**
 * Selects the most suitable locale to use from a list of options.
 * Returns undefined if there is no language that the user speaks.
 *
 * Priority order:
 * 1. Exact full locale match (e.g., user has en-NZ, schema has en-NZ)
 * 2. Base language match (e.g., user has en-US, schema has en)
 * 3. Any locale with matching base language (e.g., user has de-DE, schema has de-AT)
 */
export declare const findSuitableLocale: (options: string[], langs: readonly string[]) => string | undefined;