How to use the inputmask.format function in inputmask

_processNewValue(value) {
    let cursorStart = this.element.selectionStart;
    let cursorEnd = this.element.selectionEnd;
    let unmaskedValue = this._getUnmaskedValue();
    let oldUnmaskedValue = get(this, '_value');
    let options = get(this, '_options');

    // We only want to make changes if something is different so we don't cause infinite loops or
    // double renders.
    // We want to make sure that that values we compare are going to come out the same through
    // the masking algorithm, to ensure that we only call `update` if the values are actually different
    // (e.g. '1234.' will be masked as '1234' and so when `update` is called and passed back
    // into the component the decimal will be removed, we don't want this)
    if (Inputmask.format(String(oldUnmaskedValue), options) !== Inputmask.format(unmaskedValue, options)) {
      this.sendUpdate(unmaskedValue, value);

      // When the value is updated, and then sent back down the cursor moves to the end of the field.
      // We therefore need to put it back to where the user was typing so they don't get janked around
      schedule('afterRender', () => {
        this._syncValue();
        this.element.setSelectionRange(cursorStart, cursorEnd);
      });
    }
  },