/**
 * Retrieve a list of locales that can provide substitute for the specified locale
 * (including itself).
 *
 * For example, if 'fr-CA' is specified, then `[ 'fr', 'fr-CA' ]` is returned.
 *
 * @param locale
 * The target locale.
 *
 * @return
 * A list of locales that match the target locale.
 */
export declare function generateLocales(locale: string): string[];
/**
 * Normalize a locale so that it can be converted to a bundle path.
 *
 * @param locale
 * The target locale.
 *
 * @return The normalized locale.
 */
export declare const normalizeLocale: (locale: string) => string;
/**
 * Validates that the provided locale at least begins with a ISO 639.1/639.2 comptabile language subtag,
 * and that any additional subtags contain only valid characters.
 *
 * While locales should adhere to the guidelines set forth by RFC 5646 (https://tools.ietf.org/html/rfc5646),
 * only the language subtag is strictly enforced.
 *
 * @param locale
 * The locale to validate.
 *
 * @return
 * `true` if the locale is valid; `false` otherwise.
 */
export declare function validateLocale(locale: string): boolean;