/**
 * Validation utilities for task operations
 */
/**
 * Validates that a date string is in valid ISO 8601 format
 */
export declare function validateDateString(date: string, fieldName: string): void;
/**
 * Validates that an ID is a positive integer
 */
export declare function validateId(id: number, fieldName: string): void;
/**
 * Convert repeat configuration from user-friendly format to Vikunja API format
 *
 * Vikunja API expects:
 * - repeat_after: time in seconds
 * - repeat_mode: 0 = default (use repeat_after), 1 = monthly, 2 = from current date
 *
 * We accept:
 * - repeatAfter: number (interpreted based on repeatMode)
 * - repeatMode: 'day' | 'week' | 'month' | 'year'
 */
export declare function convertRepeatConfiguration(repeatAfter?: number, repeatMode?: 'day' | 'week' | 'month' | 'year'): {
    repeat_after?: number;
    repeat_mode?: number;
};
/**
 * Process an array in batches
 */
export declare function processBatches<T, R>(items: T[], batchSize: number, processor: (batch: T[]) => Promise<R[]>): Promise<R[]>;
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