/**
 * CronExpression Value Object
 * Represents a validated cron expression for backup scheduling
 */
export declare class CronExpression {
    private readonly _expression;
    private constructor();
    get expression(): string;
    /**
     * Create a CronExpression from a raw cron string
     * Validates the expression before creating
     */
    static create(expression: string): CronExpression;
    /**
     * Create a CronExpression from a named preset
     */
    static fromPreset(preset: string): CronExpression;
    /**
     * Get available preset names
     */
    static getPresets(): Record<string, string>;
    /**
     * Convert cron expression to a human-readable description
     */
    toHumanReadable(): string;
    toString(): string;
    equals(other: CronExpression): boolean;
    /**
     * Validate a single cron field
     */
    private static validateField;
}
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