How to use the @terrestris/ol-util/dist/MapUtil/MapUtil.getScaleForResolution function in @terrestris/ol-util

resolutions: testResolutions
      });
      const wrapper = TestUtil.mountComponent(ScaleCombo, {
        scales: [],
        map: map
      });

      // Reset the scales array, as getOptionsFromMap() will be called in
      // constructor.
      wrapper.setState({'scales': []});

      const scales = wrapper.instance().getOptionsFromMap();
      expect(scales).toBeInstanceOf(Array);
      expect(scales).toHaveLength(testResolutions.length);

      let roundScale = (Math.round(MapUtil.getScaleForResolution(
        testResolutions[testResolutions.length - 1] ,'m')));

      expect(scales[0]).toBe(roundScale);

      TestUtil.removeMap(map);
    });

pushScale = (scales: string[], resolution: number, view: OlView) => {
    let scale = MapUtil.getScaleForResolution(resolution, view.getProjection().getUnits());
    const roundScale = MapUtil.roundScale(scale);
    if (scales.includes(roundScale) ) {
      return;
    }
    scales.push(roundScale);
  }