export declare function formatDate(date: Date | string, locale?: 'en' | 'es', formatStr?: string): string;
export declare function formatDateTime(date: Date | string, locale?: 'en' | 'es'): string;
export declare function formatRelativeTime(date: Date | string, locale?: 'en' | 'es'): string;
export declare function formatNumber(number: number, locale?: 'en' | 'es', options?: Intl.NumberFormatOptions): string;
export declare function formatCurrency(amount: number, locale?: 'en' | 'es', currency?: string): string;
export declare function formatPercentage(value: number, locale?: 'en' | 'es'): string;
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