import type { unstable_MiddlewareFunction } from "react-router";
import { unstable_RouterContextProvider } from "react-router";
export declare function unstable_createRequestIDMiddleware({ generator, header, limitLength, }?: unstable_createRequestIDMiddleware.Options): unstable_createRequestIDMiddleware.ReturnType;
export declare namespace unstable_createRequestIDMiddleware {
    interface Options {
        /**
         * The name of the header to read the request ID from.
         *
         * @default "X-Request-ID"
         */
        header?: string;
        /**
         * The length of the request ID.
         *
         * @default 255
         */
        limitLength?: number;
        /**
         * A function to generate a request ID.
         *
         * @default () => crypto.randomUUID()
         */
        generator?(): string;
    }
    type ReturnType = [
        unstable_MiddlewareFunction<Response>,
        (context: unstable_RouterContextProvider) => string
    ];
}