import { PassThrough } from 'node:stream';
export declare function urlPath(strings: string[], ...values: any[]): string;
/**
 * Serializes an HTTP request context into raw HTTP/1.1 bytes.
 * Returns a Buffer for synchronous body types (null, string, Buffer, plain object)
 * or a PassThrough stream for readable/stream bodies.
 */
export declare function serializeHttpRequest(ctx: {
    method: string;
    url: URL | string;
    headers: Headers;
    body?: any;
}): Buffer | PassThrough;