/**
 * @ksefuj/validator - Strict XML checks (raw text)
 *
 * KSeF API 2.4.0 tightened XML verification. Per the MF page "Weryfikacja faktury" an invoice
 * is rejected when it:
 *   - contains XML processing instructions,
 *   - contains Unicode characters discouraged by the W3C XML spec (ranges listed below),
 *   - starts with a UTF-8 BOM,
 *   - has an XML declaration that names an encoding other than UTF-8.
 * Production enforcement starts on 2026-10-19; until then KSeF only returns X-System-Warning.
 *
 * These constructs can be dropped or normalised by XML parsers, so the checks run on the raw
 * input string rather than on a parsed document.
 *
 * Sources:
 *   https://github.com/CIRFMF/ksef-api/blob/main/faktury/weryfikacja-faktury.md
 *   https://github.com/CIRFMF/ksef-api/blob/main/api-changelog.md (version 2.4.0)
 *   https://github.com/CIRFMF/ksef-api/issues/718 (enforcement date moved to 2026-10-19)
 */
import type { ValidationIssue } from "./types.js";
export declare const KSEF_XML_RULES_URL = "https://github.com/CIRFMF/ksef-api/blob/main/faktury/weryfikacja-faktury.md";
/** Date from which KSeF PROD rejects these constructs (issue #718). */
export declare const KSEF_STRICT_XML_ENFORCEMENT_DATE = "2026-10-19";
/** Individually reported findings per code; the rest are summarised in one issue. */
export declare const MAX_REPORTED_FINDINGS = 20;
export declare function checkStrictXml(xml: string): ValidationIssue[];
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