/**
 * Accept-Language middleware for PostGraphile v5
 *
 * Parses the Accept-Language header and injects `langCodes` into the
 * GraphQL context so the i18n plugin can resolve the best translation.
 */
export interface I18nMiddlewareOptions {
    /**
     * Supported languages for Accept-Language negotiation.
     * @default ['en']
     */
    supportedLanguages?: string[];
}
/**
 * PostGraphile v5 additionalGraphQLContextFromRequest function.
 *
 * Parses Accept-Language and injects `langCodes` into the GraphQL context.
 *
 * @example
 * ```typescript
 * import { makeI18nContext } from 'graphile-i18n';
 *
 * const preset = {
 *   grafast: {
 *     context: makeI18nContext({ supportedLanguages: ['en', 'es', 'fr'] }),
 *   },
 * };
 * ```
 */
export declare function makeI18nContext(options?: I18nMiddlewareOptions): (req: any, _res: any) => Promise<{
    langCodes: string[];
}>;
/**
 * Convenience export matching the v4 API signature.
 */
export declare const additionalGraphQLContextFromRequest: (req: any, _res: any) => Promise<{
    langCodes: string[];
}>;