/**
 * XsltTransformer — XSLT-lite transformation engine
 * ────────────────────────────────────────────────────
 * A lightweight, zero-dependency XSLT 1.0 subset transformer.
 *
 * Supported XSLT constructs
 * ─────────────────────────
 *  xsl:stylesheet / xsl:transform
 *  xsl:template match="..."
 *  xsl:apply-templates [select="..."]
 *  xsl:value-of select="..."
 *  xsl:copy-of select="..."
 *  xsl:element name="..."
 *  xsl:attribute name="..."
 *  xsl:text
 *  xsl:if test="..."
 *  xsl:choose / xsl:when / xsl:otherwise
 *  xsl:for-each select="..."
 *  xsl:output method="xml|html|text" indent="yes|no"
 *  xsl:param / xsl:variable (local string values)
 *  xsl:sort (lexicographic on current node's text)
 *  Literal result elements (copied to output)
 *
 * Limitations (intentional subset)
 * ─────────────────────────────────
 *  • No XSLT 2.0 / 3.0 features
 *  • No external document() function
 *  • No named templates / call-template
 *  • XPath subset from XPathEngine (child, descendant, attribute, self, parent)
 *  • No number formatting
 *
 * Usage
 * ─────
 *  import { XsltTransformer, transformXml } from 'xml-xsd-engine/transform';
 *
 *  const result = transformXml(sourceXml, stylesheetXml);
 *  // result is an XML string
 */
import { XmlDocument } from '../parser/XmlNodes';
export interface XsltOptions {
    /** Initial parameters passed to the stylesheet.  Default: {} */
    params?: Record<string, string>;
    /** Indentation for XML/HTML output.  Default: 2 */
    indent?: number;
}
/** Transform an XML source string with an XSLT stylesheet string. */
export declare function transformXml(sourceXml: string, stylesheetXml: string, options?: XsltOptions): string;
/** Transform an already-parsed XmlDocument with an XSLT stylesheet string. */
export declare function transformDocument(doc: XmlDocument, stylesheetXml: string, options?: XsltOptions): string;
export declare class XsltTransformer {
    private templates;
    private output;
    private globalVars;
    private opts;
    constructor(stylesheetXml: string, options?: XsltOptions);
    /** Transform a source XML string. */
    transform(sourceXml: string): string;
    /** Transform an already-parsed document. */
    transformDocument(doc: XmlDocument): string;
    private _parseStylesheet;
    private _findTemplate;
    /** Very simple pattern matching: supports * / element-name / @attr */
    private _matchesPattern;
    private _defaultPriority;
    private _applyTemplates;
    private _executeTemplate;
    private _executeNode;
    private _valueOf;
    private _copyOf;
    private _forEach;
    private _if;
    private _choose;
    private _element;
    private _literalElement;
    private _evalSelect;
    private _evalTest;
    private _expandAttrValue;
    private _isXsl;
}
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