/**
 * Mapper Utility Functions
 *
 * Common utilities for data transformation in mappers.
 */
/**
 * Convert snake_case to camelCase
 */
export declare function snakeToCamel(str: string): string;
/**
 * Convert camelCase to snake_case
 */
export declare function camelToSnake(str: string): string;
/**
 * Parse ISO date string to Date object
 */
export declare function parseDate(dateString: string | null | undefined): Date | null;
/**
 * Format Date to ISO string for API
 */
export declare function formatDate(date: Date | null | undefined): string | null;
/**
 * Trim string if defined
 */
export declare function trimString(str: string | undefined): string | undefined;
/**
 * Pick only defined values from object (for PATCH requests)
 */
export declare function pickDefined<T extends Record<string, unknown>>(obj: T): Partial<T>;
/**
 * Convert object keys from snake_case to camelCase
 */
export declare function keysToCamel<T extends Record<string, unknown>>(obj: T): Record<string, unknown>;
/**
 * Convert object keys from camelCase to snake_case
 */
export declare function keysToSnake<T extends Record<string, unknown>>(obj: T): Record<string, unknown>;
/**
 * Map nullable DB field to optional response field.
 * Converts null/undefined to undefined for API responses.
 */
export declare function toOptional<T>(value: T | null | undefined): T | undefined;
/**
 * Map optional entity value to nullable DB field.
 * Converts undefined to null for database storage.
 */
export declare function toNullable<T>(value: T | undefined): T | null;
/**
 * Map optional Date to nullable ISO string for DB storage.
 * Converts Date to ISO string, undefined to null.
 */
export declare function dateToNullable(value: Date | undefined): string | null;
/**
 * Get field value from object supporting both snake_case and camelCase keys.
 * Useful for mappers that need to handle responses in either format.
 * Prefers camelCase if both exist.
 */
export declare function getField<T>(data: Record<string, unknown>, snakeKey: string, camelKey: string): T | undefined;
/**
 * Parse date from either string or Date, handling both formats.
 * Returns undefined for invalid dates.
 */
export declare function parseDateSafe(value: unknown): Date | undefined;
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