How to use the @material/slider/dist/mdc.slider.MDCSliderFoundation.strings function in @material/slider

setLastTrackMarkersStyleProperty: (propertyName, value) => {
        // We remove and append new nodes, thus, the last track marker must be dynamically found.
        const lastTrackMarker = this.root_.querySelector(MDCSliderFoundation.strings.LAST_TRACK_MARKER_SELECTOR);
        lastTrackMarker.style.setProperty(propertyName, value);
      },
      isRTL: () => getComputedStyle(this.root_).direction === 'rtl',