import { CustomMapping } from './customLocaleMapping';
/**
 * Resolves the canonical locale for a given locale.
 * @param locale - The locale to resolve the canonical locale for
 * @param customMapping - The custom mapping to use for resolving the canonical locale
 * @returns The canonical locale, or the input locale when no canonical mapping exists.
 */
export declare function _resolveCanonicalLocale(locale: string, customMapping?: CustomMapping): string;