How to use the @material/slider/index.MDCSlider function in @material/slider

initSlider = (sliderEl) => {
    if (!sliderEl) return;
    this.sliders.push(new MDCSlider(sliderEl));
  }

  initSlider = ele => ele && this.componentInstances.push(new MDCSlider(ele));
  initSwitch = ele => ele && this.componentInstances.push(new MDCSwitch(ele));

initSlider = (sliderEl) => {
    if (!sliderEl) return;
    this.slider = new MDCSlider(sliderEl);
  }