/**
 * Formats the date according to the specified format string.
 * @param {Date} date - The date to format.
 * @param {string} formatStr - The format string (e.g., 'YYYY-MM-DD hh:mm:ss').
 * @returns {string} The formatted date string.
 * @example
 * const date = new Date('2023-05-01T12:30:45');
 * const formatted = format(date, 'YYYY-MM-DD hh:mm:ss'); // '2023-05-01 12:30:45'
 */
export declare function format(date: Date, formatStr: string): string;