import { type Result } from "../utils/result.ts";
/**
 * Validate a URL to protect against Server-Side Request Forgery (SSRF) attacks.
 *
 * Rejects:
 * - Non-http/https protocols (file://, ftp://, data:, javascript:, etc.)
 * - Private IP addresses (RFC 1918, loopback, link-local)
 * - Internal hostnames (localhost, *.local, *.internal)
 *
 * @param url - The URL to validate.
 * @returns `ok()` if the URL is safe, or `err(reason)` describing why the URL was rejected.
 */
export declare function validateUrl(url: string): Result<void, string>;
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