How to use the @material/menu/constants.strings function in @material/menu

// occurs after the menu is already closed.
            _this.isMenuOpen_ = false;
            _this.selectedText_.removeAttribute('aria-expanded');
            if (document.activeElement !== _this.selectedText_) {
                _this.foundation_.handleBlur();
            }
        };
        this.targetElement_.addEventListener('change', this.handleChange_);
        this.targetElement_.addEventListener('focus', this.handleFocus_);
        this.targetElement_.addEventListener('blur', this.handleBlur_);
        this.targetElement_.addEventListener('click', this.handleClick_);
        if (this.menuElement_) {
            this.selectedText_.addEventListener('keydown', this.handleKeydown_);
            this.menu_.listen(menuSurfaceConstants.strings.CLOSED_EVENT, this.handleMenuClosed_);
            this.menu_.listen(menuSurfaceConstants.strings.OPENED_EVENT, this.handleMenuOpened_);
            this.menu_.listen(menuConstants.strings.SELECTED_EVENT, this.handleMenuSelected_);
            if (this.hiddenInput_ && this.hiddenInput_.value) {
                // If the hidden input already has a value, use it to restore the select's value.
                // This can happen e.g. if the user goes back or (in some browsers) refreshes the page.
                var enhancedAdapterMethods = this.getEnhancedSelectAdapterMethods_();
                enhancedAdapterMethods.setValue(this.hiddenInput_.value);
            }
            else if (this.menuElement_.querySelector(strings.SELECTED_ITEM_SELECTOR)) {
                // If an element is selected, the select should set the initial selected text.
                var enhancedAdapterMethods = this.getEnhancedSelectAdapterMethods_();
                enhancedAdapterMethods.setValue(enhancedAdapterMethods.getValue());
            }
        }
        // Initially sync floating label
        this.foundation_.handleChange(/* didChange */ false);
        if (this.root_.classList.contains(cssClasses.DISABLED)
            || (this.nativeControl_ && this.nativeControl_.disabled)) {

destroy() {
    this.targetElement_.removeEventListener('change', this.handleChange_);
    this.targetElement_.removeEventListener('focus', this.handleFocus_);
    this.targetElement_.removeEventListener('blur', this.handleBlur_);
    this.targetElement_.removeEventListener('keydown', this.handleKeydown_);
    this.targetElement_.removeEventListener('click', this.handleClick_ as EventListener);

    if (this.menu_) {
      this.menu_.unlisten(menuSurfaceConstants.strings.CLOSED_EVENT, this.handleMenuClosed_);
      this.menu_.unlisten(menuSurfaceConstants.strings.OPENED_EVENT, this.handleMenuOpened_);
      this.menu_.unlisten(menuConstants.strings.SELECTED_EVENT, this.handleMenuSelected_);
      this.menu_.destroy();
    }

    if (this.ripple) {
      this.ripple.destroy();
    }
    if (this.outline_) {
      this.outline_.destroy();
    }
    if (this.leadingIcon_) {
      this.leadingIcon_.destroy();
    }
    if (this.helperText_) {
      this.helperText_.destroy();
    }
    if (this.validationObserver_) {

destroy() {
    const element = this.nativeControl_ ? this.nativeControl_ : this.selectedText_;

    element.removeEventListener('change', this.handleChange_);
    element.removeEventListener('focus', this.handleFocus_);
    element.removeEventListener('blur', this.handleBlur_);
    element.removeEventListener('keydown', this.handleKeydown_);
    ['mousedown', 'touchstart'].forEach((evtType) => {
      element.removeEventListener(evtType, this.handleClick_);
    });

    if (this.menu_) {
      this.menu_.unlisten(menuSurfaceConstants.strings.CLOSED_EVENT, this.handleMenuClosed_);
      this.menu_.unlisten(menuSurfaceConstants.strings.OPENED_EVENT, this.handleMenuOpened_);
      this.menu_.unlisten(menuConstants.strings.SELECTED_EVENT, this.handleMenuSelected_);
      this.menu_.destroy();
    }

    if (this.ripple) {
      this.ripple.destroy();
    }
    if (this.outline_) {
      this.outline_.destroy();
    }
    if (this.leadingIcon_) {
      this.leadingIcon_.destroy();
    }
    if (this.helperText_) {
      this.helperText_.destroy();
    }
    if (this.validationObserver_) {