import type { SSRManifest, SSRManifestI18n } from '../core/app/types.js';
import type { APIContext } from '../types/public/context.js';
/**
 * Fallback routing decision types
 */
export type FallbackRouteResult = {
    type: 'none';
} | {
    type: 'redirect';
    pathname: string;
} | {
    type: 'rewrite';
    pathname: string;
};
/**
 * Options for computing fallback routes.
 * Uses types from APIContext and SSRManifest to ensure type safety.
 */
export interface ComputeFallbackRouteOptions {
    /** Pathname from url.pathname */
    pathname: APIContext['url']['pathname'];
    /** Response status code */
    responseStatus: number;
    /** Current locale from APIContext */
    currentLocale: APIContext['currentLocale'];
    /** Fallback configuration from i18n manifest */
    fallback: NonNullable<SSRManifestI18n['fallback']>;
    /** Fallback type from i18n manifest */
    fallbackType: SSRManifestI18n['fallbackType'];
    /** Locales from i18n manifest */
    locales: SSRManifestI18n['locales'];
    /** Default locale from i18n manifest */
    defaultLocale: SSRManifestI18n['defaultLocale'];
    /** Routing strategy from i18n manifest */
    strategy: SSRManifestI18n['strategy'];
    /** Base path from manifest */
    base: SSRManifest['base'];
}
/**
 * Compute fallback route for failed responses.
 * Pure function - no APIContext, no Response objects, no URL objects.
 *
 * This function determines whether a failed request should be redirected or rewritten
 * to a fallback locale based on the i18n configuration.
 */
export declare function computeFallbackRoute(options: ComputeFallbackRouteOptions): FallbackRouteResult;