How to use the @material/tab-bar/foundation.strings function in @material/tab-bar

notifyTabActivated: (index: number) => {
        // Synchronize the tabs `activeIndex` to the foundation.
        // This is needed when a tab is changed via a click, for example.
        this.activeIndex = index;
        this.dispatchEvent(new CustomEvent(
            MDCTabBarFoundation.strings.TAB_ACTIVATED_EVENT,
            {detail: {index}, bubbles: true, cancelable: true}));
      },
    };

notifyTabActivated: index => {
        emitCustomEvent(
          this.$el,
          MDCTabBarFoundation.strings.TAB_ACTIVATED_EVENT,
          { index },
          true,
        );

        this.$emit('change', index);
      },
    });