import type { I18nConfig } from './types.js';
/** Cookie name the template uses to persist a visitor's locale choice. */
/**
 * Cookie name for the persisted locale choice. Uses NEXT_LOCALE — the convention
 * Next.js and its i18n ecosystem expect — so the cookie is interoperable with
 * other libraries that read the active locale (instead of a plugin-specific
 * name). Written only under functional consent; cleared when that consent is
 * withdrawn (see consent cookieMap).
 */
export declare const LOCALE_COOKIE_NAME = "NEXT_LOCALE";
type NegotiateLocaleArgs = {
    /** Raw Accept-Language header value */
    acceptLanguage?: null | string;
    config: I18nConfig;
    /** Value of the locale cookie, if present (from LOCALE_COOKIE_NAME) */
    cookieLocale?: null | string;
};
/**
 * Resolves which locale to serve, in priority order:
 *   1. Cookie (explicit prior choice)
 *   2. Accept-Language header (best match against configured locales)
 *   3. Configured default locale
 *
 * Pure function — the template feeds it request data and acts on the result
 * (redirect, cookie set). No Next.js or request objects here.
 */
export declare function negotiateLocale({ acceptLanguage, config, cookieLocale, }: NegotiateLocaleArgs): string;
/**
 * Parses an Accept-Language header and returns the best-matching configured
 * locale, or undefined if none match.
 *
 * Matches on the primary subtag (e.g. "en-US" matches configured "en"),
 * respecting the header's quality-value ordering.
 */
export declare function matchAcceptLanguage(acceptLanguage: null | string | undefined, config: I18nConfig): string | undefined;
export {};