/**
 * Parse duration strings like "5000", "1s", "5m", "1h", "1d" into milliseconds.
 * @param value - Duration value or string with unit suffix
 * @param unit - Optional unit if value is numeric (default 'ms')
 * @returns Duration in milliseconds
 * @throws Error if format is invalid
 */
export declare function parseDurationToMs(value: number | string, unit?: string): number;
/**
 * Validate a cron expression (5-field format: minute hour day-of-month month day-of-week)
 * @param cronExpression - Cron expression to validate
 * @returns true if valid, false otherwise
 */
export declare function isValidCronExpression(cronExpression: string): boolean;
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