How to use the numbro.unformat function in numbro

const handleKeyDown = (e) => {
            const { type, key } = e;
            const stringValue = ref.current.value;
            const numberValue = stringValue ? Number(numbro.unformat(stringValue)) : 0;
            // default to 0 if defaultValue is NaN
            if (is.number(numberValue) && !is.empty(stringValue)) {
              let newValue = numberValue;
              if (key === 'ArrowDown') {
                newValue = Number(numbro(numberValue).subtract(props.step).format({ mantissa: countDecimals(props.step) }));
                if (greaterThanMin(newValue) && lessThanMax(newValue)) {
                  const updateError = displayErrorMessage(!is.empty(stringValue) ? newValue : '');
                  context.updateState({ value: toCurrency(newValue, countDecimals(props.step)), ...updateError }, () => {
                    if (is.fn(props.onChange)) {
                      props.onChange(newValue, props.id, type, key);
                    }
                  });
                }
              } else if (key === 'ArrowUp') {
                newValue = Number(numbro(numberValue).add(props.step).format({ mantissa: countDecimals(props.step) }));
                if (greaterThanMin(newValue) && lessThanMax(newValue)) {

function handleOnBlur(e: React.FocusEvent) {
    const input = e.currentTarget as HTMLInputElement;

    let value = ValueLineController.autoFixString(input.value, false);

    if (numbro.languageData().delimiters.decimal == ',' && !value.contains(",") && value.trim().length > 0) //Numbro transforms 1.000 to 1,0 in spanish or german
      value = value + ",00";

    if (p.format && p.format.endsWith("%")) {
      if (value && !value.endsWith("%"))
        value += "%";
    }

    const result = value == undefined || value.length == 0 ? null : numbro.unformat(value, p.format);
    setText(undefined);
    if (result != p.value)
      p.onChange(result);

    if (p.htmlAttributes && p.htmlAttributes.onBlur)
      p.htmlAttributes.onBlur(e);
  }

private convertStringToNumber = (val: string) => {
    if (!val) {
      return undefined;
    }

    if (this.isSeparatorLastChar(val) || ((val.includes(',') || val.includes('.')) && val.slice(-1) === '0')) {
      return val;
    }

    return numbro.unformat(val);
  };

private restoreNumberWithLocale = (val?: string | number): number | undefined => {
    if (!val) {
      return undefined;
    }

    if (!isNaN(Number(val))) {
      return numbro(val).value();
    }

    return numbro.unformat(String(val));
  };