/**
 * XmlCanonical — Canonical XML 1.0 and Exclusive Canonical XML
 *
 * v1.7.0 performance improvements:
 *  • _serializeElement: replaced new Map(ctx.nsScope) / new Map(ctx.renderedNs) full
 *    clones (O(scope-size) per element) with delta-based save/restore — only the
 *    keys mutated on each element are saved and restored (O(decls-on-element)).
 *  • _normalizeText / _escapeAttrValue: collapsed chained .replace() calls into a
 *    single regex pass with a replacer function, reducing string allocations.
 *  • ns-sort comparator hoisted to a module-level constant to avoid closure alloc.
 *  • regularAttrs array reused across calls where possible via pre-sized push.
 *  • Subtree memoization via WeakMap<XmlElement, string>: when the same element
 *    is serialized multiple times within the same canonicalize() call (e.g.
 *    diffXml comparing shared subtrees), the cached string is returned directly.
 *    Cache key is (element, mode, withComments) — invalidated automatically when
 *    the element is garbage-collected.
 *
 * G30 — v1.7.0 / v1.7.0
 */
import { XmlDocument, XmlElement } from '../parser/XmlNodes';
/** C14N mode */
export type CanonicalizeMode = 'inclusive' | 'exclusive';
export interface CanonicalizeOptions {
    /**
     * 'inclusive' (default): all in-scope namespace declarations rendered on every element.
     * 'exclusive': only namespace declarations that are actually used in the subtree.
     */
    mode?: CanonicalizeMode;
    /**
     * Exclusive C14N only: namespace prefixes in this list are always rendered even
     * if not directly used (xs:InclusiveNamespaces/@PrefixList).
     */
    inclusiveNamespaces?: string[];
    /**
     * When true, comments are preserved in output.  Default: false.
     */
    withComments?: boolean;
}
/**
 * Serialize `input` (document or element subtree) to Canonical XML form.
 *
 * @example
 * const c14n = canonicalize(parseXml(xmlStr));
 * // → deterministic, comparable byte sequence
 */
export declare function canonicalize(input: XmlDocument | XmlElement, options?: CanonicalizeOptions): string;
/**
 * Clear the subtree serialization cache.
 * No-op in current implementation — cache is per-invocation.
 * Retained for API compatibility.
 */
export declare function clearCanonicalCache(): void;
//# sourceMappingURL=XmlCanonical.d.ts.map