import { Locale } from "../types/locale";
/**
 * This function returns a regexp that is supposed to be as close as possible as the numberRegexp,
 * but its purpose is to be used by the tokenizer.
 *
 * - it tolerates extra characters at the end. This is useful because the tokenizer
 *   only needs to find the number at the start of a string
 * - it does not support % symbol, in formulas % is an operator
 */
export declare const getFormulaNumberRegex: (decimalSeparator: string) => RegExp;
/**
 * Return true if the argument is a "number string".
 *
 * Note that "" (empty string) does not count as a number string
 */
export declare function isNumber(value: string | undefined, locale: Locale): boolean;
/**
 * Convert a string into a number. It assumes that the string actually represents
 * a number (as determined by the isNumber function)
 *
 * Note that it accepts "" (empty string), even though it does not count as a
 * number from the point of view of the isNumber function.
 */
export declare function parseNumber(str: string, locale: Locale): number;
export declare function percentile(values: number[], percent: number, isInclusive: boolean): number;