/**
 * Cron Manager - Native OS crontab manipulation
 * Zero dependencies - uses direct crontab binary commands
 * Unix/Linux/macOS only (Windows support via Task Scheduler would be separate)
 */
export interface CronEntry {
    id: string;
    cronExpression: string;
    command: string;
    comment?: string;
}
export declare class CronManager {
    private static readonly MARKER_PREFIX;
    private static readonly NCP_SECTION_START;
    private static readonly NCP_SECTION_END;
    constructor();
    /**
     * Check if crontab command is available
     */
    private isCrontabAvailable;
    /**
     * Get helpful error message when crontab is not available
     */
    private getCrontabNotAvailableMessage;
    /**
     * Get current user's crontab
     */
    private getCurrentCrontab;
    /**
     * Write crontab content
     */
    private writeCrontab;
    /**
     * Parse NCP jobs from crontab
     */
    private parseNCPJobs;
    /**
     * Parse a single cron line
     */
    private parseCronLine;
    /**
     * Get non-NCP crontab entries
     */
    private getNonNCPEntries;
    /**
     * Build NCP section content
     */
    private buildNCPSection;
    /**
     * Add or update a cron job
     */
    addJob(jobId: string, cronExpression: string, command: string): void;
    /**
     * Remove a cron job
     */
    removeJob(jobId: string): void;
    /**
     * Get all NCP jobs from crontab
     */
    getJobs(): CronEntry[];
    /**
     * Get a specific job
     */
    getJob(jobId: string): CronEntry | null;
    /**
     * Check if a job exists in crontab
     */
    hasJob(jobId: string): boolean;
    /**
     * Remove all NCP jobs from crontab
     */
    removeAllJobs(): void;
    /**
     * Validate cron expression format
     */
    static validateCronExpression(expression: string): {
        valid: boolean;
        error?: string;
    };
}
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