export declare const PRESETS: Record<string, string>;
export declare function presetToCron(preset: string): string;
export declare function validateCron(expr: string): boolean;
export declare function resolveCron(opts: {
    every?: string;
    cron?: string;
}): {
    cron: string;
    preset: string;
};
export declare function formatSchedule(cron: string, preset: string): string;
export declare function cronToOnCalendar(cron: string): string;