How to use the @material/notched-outline/foundation.cssClasses function in @material/notched-outline

mounted() {
    const {
      OUTLINE_UPGRADED,
      NO_LABEL,
    } = MDCnotchedOutlineFoundation.cssClasses;

    const adapter = {
      addClass: className => {
        this.$set(this.outlinedClasses, className, true);
      },
      removeClass: className => {
        this.$delete(this.outlinedClasses, className);
      },

      setNotchWidthProperty: width =>
        this.$set(this.notchStyles, 'width', `${width}px`),
      removeNotchWidthProperty: () => this.$delete(this.notchStyles, 'width'),
    };

    this.foundation = new MDCnotchedOutlineFoundation(adapter);
    this.foundation.init();

mounted() {
    const {
      OUTLINE_UPGRADED,
      NO_LABEL,
    } = MDCnotchedOutlineFoundation.cssClasses;

    const adapter = {
      addClass: className => {
        this.$set(this.outlinedClasses, className, true);
      },
      removeClass: className => {
        this.$delete(this.outlinedClasses, className);
      },

      setNotchWidthProperty: width =>
        this.$set(this.notchStyles, 'width', `${width}px`),
      removeNotchWidthProperty: () => this.$delete(this.notchStyles, 'width'),
    };

    this.foundation = new MDCnotchedOutlineFoundation(adapter);
    this.foundation.init();