import type { VextMiddleware } from "../../types/middleware.js";
import type { VextFrontendMode, VextFrontendUserConfig } from "../contract/types.js";
export interface CreateFrontendNotFoundHandlerOptions {
    rootDir: string;
    mode: VextFrontendMode;
    config: VextFrontendUserConfig | undefined;
    fallbackHandler: VextMiddleware;
}
export declare function createFrontendNotFoundHandler(options: CreateFrontendNotFoundHandlerOptions): VextMiddleware;
export declare function assertFrontendOutputReady(options: CreateFrontendNotFoundHandlerOptions): void;