/**
 * Gets a formatted string with thousands separators from given number
 * @param num{Number} - source number
 * @param separator{String=} - separator between every thousand
 * @return {string}
 * @example
 * // How to format a number with commas as thousands separators?
 * const str = getStrWithThousandSeparator(1000000, ",");
 * console.log(str); // => "1,000,000"
 */
export function getStrWithThousandSeparator(num: number, separator?: string | undefined): string;
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