type FormatOptions = {
    decimals?: number;
    useLocale?: boolean;
    customSuffixes?: Array<string>;
};
/**
 * Formats a number with abbreviations (K, M, B, etc.) and optional locale formatting.
 * @param input - The number or numeric string to format.
 * @param options.decimals - Number of decimal places (default 2).
 * @param options.useLocale - Whether to use locale separators (default true).
 * @param options.customSuffixes - Custom suffix array for magnitudes.
 * @returns The formatted number string.
 */
declare const formatNumber: (input: any, options?: FormatOptions) => string;

export { type FormatOptions, formatNumber };