/**
 * Runtime configuration for locale detection, routing, and fallbacks.
 */
type LinguiRouterConfig = {
    /**
     * Supported locales in priority order (e.g., ["en", "it"]).
     * Uses BCP 47 codes or project-specific variants.
     */
    locales: readonly string[];
    /**
     * Default locale used when no locale can be detected.
     * Should be included in `locales`.
     */
    defaultLocale: string;
    /**
     * Locale code used for pseudo-localization during development.
     */
    pseudoLocale?: string;
    /**
     * One or more top-level path segments that must not be treated as locales.
     * For example, ["api"].
     */
    exclude: readonly string[];
    /**
     * Redirect policy when a locale is detected.
     */
    redirect: RedirectBehavior;
    /**
     * Current execution environment.
     */
    runtimeEnv: "client" | "server";
    /**
     * Locale path parameter name (e.g., "locale" for `/:locale?/*`).
     */
    localeParamName: string;
};
/**
 * Maps locale codes to message catalog locations.
 *
 * Keys are locale codes (e.g., "en", "it").
 * Values are URLs or import paths to catalogs (e.g., "/locales/en/messages.po").
 */
type LocaleManifest = Record<string, string>;
/**
 * Controls redirect behavior when a locale is detected.
 *
 * - "auto": Redirect only if the detected locale differs from the default.
 * - "always": Always redirect to the detected locale.
 * - "never": Never redirect based on the detected locale.
 */
type RedirectBehavior = "auto" | "always" | "never";
/**
 * Normalizes a locale code by converting to lowercase and replacing underscores with hyphens.
 *
 * @param locale - The locale code to normalize (e.g., "en_US").
 * @returns The normalized locale code (e.g., "en-us").
 */
declare function normalizeLocaleKey(locale: string): string;

export { normalizeLocaleKey as n };
export type { LinguiRouterConfig as L, RedirectBehavior as R, LocaleManifest as a };