import { type ClientRequest, type IncomingMessage, type RequestOptions } from 'node:http';
/** Literal-only loopback target primitives shared by the terminal and session
 * preview reverse proxies. Keeping DNS names out of this module makes it
 * impossible for either proxy to grow a DNS-rebinding SSRF path accidentally. */
export type LiteralLoopbackHost = '127.0.0.1' | '::1';
export declare function isLiteralLoopbackHost(value: unknown): value is LiteralLoopbackHost;
export declare function isTcpPort(value: unknown): value is number;
/** Runtime-checked HTTP/WS handshake dial. Callers cannot override host/port
 * through RequestOptions because the validated values are written last. */
export declare function requestLiteralLoopback(target: {
    host: LiteralLoopbackHost;
    port: number;
}, options: Omit<RequestOptions, 'host' | 'hostname' | 'port'>, callback?: (response: IncomingMessage) => void): ClientRequest;
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