/**
 * Network Validation Utilities
 *
 * Validation functions for network-related data including URLs, email addresses,
 * and username validation with security considerations.
 */
/**
 * True if `hostname` is a loopback, private, link-local, unique-local, or known
 * cloud-metadata address/name. This is the single source of truth for the SSRF
 * denylist — shared by `ConfigurationSchema`'s `UrlSchema`,
 * `WordPressClient.validateAndSanitizeUrl`, and `validateUrl` below, so the
 * policy can't drift between call sites.
 *
 * Callers should skip this check entirely when `ALLOW_PRIVATE_URLS=true`.
 */
export declare function isDisallowedHostname(hostname: string): boolean;
/** True when the operator has explicitly opted in to private/loopback URLs (local dev). */
export declare function isPrivateUrlAllowed(): boolean;
/** True when the operator has explicitly opted in to plain-HTTP URLs (local dev). */
export declare function isInsecureHttpAllowed(): boolean;
/**
 * Validates and sanitizes URLs with enhanced edge case handling
 */
export declare function validateUrl(url: string, fieldName?: string): string;
/**
 * Validates email addresses
 */
export declare function validateEmail(email: string): string;
/**
 * Validates username format with enhanced security checks
 */
export declare function validateUsername(username: string): string;
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