export declare const MONTHS_LEAP: number[];
export declare const MONTHS: number[];
/**
 * Checks if a given string is in a particular format
 * Eg:
 *  isDateFormat('2024-02-09', 'YYYY-MM-DD'); // true
 *  isDateFormat('2024-02-09T14:30', 'YYYY-MM-DD'); // false
 *
 * @param {unknown} input - String to format (eg: '2024-08-01')
 * @param {string} spec - Spec to validate (Eg: 'YYYY-MM-DD')
 */
declare function isDateFormat(input: unknown, spec: string): input is string;
export { isDateFormat, isDateFormat as default };