/**
 * Bidi bracket pair functions
 * Port of bidi-js brackets.js
 */
/**
 * Get the closing bracket character for an opening bracket
 * @param char Opening bracket character
 * @returns Corresponding closing bracket character, or null if not an opening bracket
 */
export declare function openingToClosingBracket(char: string): string | null;
/**
 * Get the opening bracket character for a closing bracket
 * @param char Closing bracket character
 * @returns Corresponding opening bracket character, or null if not a closing bracket
 */
export declare function closingToOpeningBracket(char: string): string | null;
/**
 * Get the canonical bracket character for a bracket
 * @param char Bracket character
 * @returns Canonical form of the bracket character, or null if not applicable
 */
export declare function getCanonicalBracket(char: string): string | null;