import type * as logger from "@superbuilders/slog";
/**
 * Converts problematic HTML entities to their numeric equivalents or actual characters.
 * This prevents validation errors from the QTI API which doesn't accept named HTML entities.
 *
 * @param xml The XML string to process
 * @param logger The logger instance
 * @returns The XML string with HTML entities converted
 */
export declare function convertHtmlEntities(xml: string, logger: logger.Logger): string;
/**
 * Fixes unescaped angle brackets within MathML mo elements.
 * This handles the common case where < and > symbols are not properly escaped
 * within mathematical operator elements.
 *
 * @param xml The XML string to process
 * @param logger The logger instance
 * @returns The XML string with properly escaped angle brackets in mo elements
 */
export declare function fixMathMLOperators(xml: string, logger: logger.Logger): string;
/**
 * Strips all XML comments from the provided XML string.
 * This prevents issues with malformed comments that could cause XML parsing errors.
 *
 * @param xml The XML string to process
 * @param logger The logger instance
 * @returns The XML string with all comments removed
 */
export declare function stripXmlComments(xml: string, logger: logger.Logger): string;
/**
 * Removes consecutive newlines from the XML string, leaving only single newlines.
 * This handles all types of line endings (Unix \n, Windows \r\n, and mixed).
 *
 * @param xml The XML string to process
 * @param logger The logger instance
 * @returns The XML string with consecutive newlines reduced to single newlines
 */
export declare function removeDoubleNewlines(xml: string, logger: logger.Logger): string;
/**
 * Fixes Khan Academy graphie URLs by appending .svg extension if missing.
 * This handles URLs in the format: https://cdn.kastatic.org/ka-perseus-graphie/[hash]
 *
 * @param xml The XML string to process
 * @param logger The logger instance
 * @returns The XML string with properly formatted Khan graphie URLs
 */
export declare function fixKhanGraphieUrls(xml: string, logger: logger.Logger): string;
/**
 * MISSION CRITICAL: Fixes unescaped inequality operators throughout the XML.
 * - For qti-value elements: Escapes to HTML entities (&lt;= and &gt;=) for ASCII input
 * - For all other content: Converts to Unicode symbols (≤ and ≥) for proper display
 *
 * This function uses EXTREMELY robust named capture groups and multiple safeguards
 * to ensure it NEVER corrupts valid XML.
 *
 * @param xml The XML string to process
 * @param logger The logger instance
 * @returns The XML string with properly handled inequality operators
 */
export declare function fixInequalityOperators(xml: string, logger: logger.Logger): string;
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