/**
 * Normalizes XML output from x2js to match C14N canonicalization behavior.
 *
 * x2js escapes `'` → `'` and `"` → `"`. The XAdES-BES signature hashes the raw XML,
 * but the SRI verifies using C14N which resolves these character references back to literal chars.
 * This mismatch causes FIRMA_INVALIDA. We pre-resolve them so the hash matches what the SRI computes.
 *
 * Safe because:
 * - `'` in attributes is valid since x2js uses double-quote delimiters (`useDoubleQuotes: true`)
 * - `"` is only replaced in text content (between > and <), not inside attribute values
 * - `&amp;`, `&lt;`, `&gt;` are NOT touched — these require escaping in XML
 */
export declare function normalizeXmlForC14N(xml: string): string;