export interface UrlValidationResult {
    ok: boolean;
    reason?: string;
    resolvedIps?: string[];
}
/**
 * Validates a webhook URL is safe to call.
 * Resolves DNS at validation time (not delivery time) to prevent rebinding.
 *
 * Set RELAY_ALLOW_PRIVATE_WEBHOOKS=1 to bypass private-IP checks
 * (e.g. for local n8n at http://127.0.0.1:5678).
 */
export declare function validateWebhookUrl(rawUrl: string): Promise<UrlValidationResult>;
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