export * from './errors';
export * from './validation';
export * from './logger';
export * from './encryption';
export declare function sleep(ms: number): Promise<void>;
export declare function isNode(): boolean;
export declare function isBrowser(): boolean;
export declare function getEnvironmentVariable(name: string, defaultValue?: string): string | undefined;
export declare function formatCurrency(amount: number, currency?: string): string;
export declare function formatPercentage(value: number, decimals?: number): string;
export declare function debounce<T extends (...args: unknown[]) => unknown>(func: T, wait: number): (...args: Parameters<T>) => void;
export declare function throttle<T extends (...args: unknown[]) => unknown>(func: T, limit: number): (...args: Parameters<T>) => void;
export declare function deepMerge<T extends Record<string, unknown>>(target: T, source: Partial<T>): T;
export declare function pickFields<T extends Record<string, unknown>, K extends keyof T>(obj: T, fields: K[]): Pick<T, K>;
export declare function omitFields<T extends Record<string, unknown>, K extends keyof T>(obj: T, fields: K[]): Omit<T, K>;
export declare function groupBy<T, K extends string | number | symbol>(array: T[], keyFn: (item: T) => K): Record<K, T[]>;
export declare function chunk<T>(array: T[], size: number): T[][];
export declare function unique<T>(array: T[], keyFn?: (item: T) => unknown): T[];
export declare function sortBy<T>(array: T[], keyFn: (item: T) => string | number, direction?: 'asc' | 'desc'): T[];
export declare function createQueryString(params: Record<string, unknown>): string;
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