/**
 * Converts PostgreSQL-style SQL placeholders ($1, $2, ...) to MySQL-style placeholders (?).
 * Maintains full compatibility with repeated and unordered params.
 *
 * @param {string} query - The PostgreSQL-style query.
 * @param {any[]} params - Parameters corresponding to placeholders.
 * @param {(reason?: any) => void} [errCallback]
 * @returns {{ query: string, params: any[] }} - MySQL-compatible query and reordered parameters.
 */
export function convertPgToMySQLSyntax(query: string, params: any[], errCallback?: (reason?: any) => void): {
    query: string;
    params: any[];
};
/**
 * Validates if a PostgreSQL-style query with $1, $2, ... placeholders
 * matches the number of parameters in the params array.
 * Ignores other placeholder styles like :name or ?.
 *
 * @param {string} query - SQL query with $n placeholders.
 * @param {any[]} params - Array of parameter values.
 * @param {(reason?: any) => void} [errCallback]
 * @returns {true} Returns true if valid.
 * @throws {Error} Throws if placeholders reference missing parameters or invalid indexes.
 */
export function validatePostgresParams(query: string, params: any[], errCallback?: (reason?: any) => void): true;