/**
 * Format a number as a currency string.
 * uses Intl.NumberFormat for locale-aware formatting.
 *
 * @param amount - The numeric amount to format (e.g., 1234.56)
 * @param currency - The ISO 4217 currency code (default: 'USD')
 * @param locale - The BCP 47 language tag (default: 'en-US')
 * @returns The formatted currency string
 */
export declare function formatCurrency(amount: number, currency?: string, locale?: string): string;
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