JS errors in Safari browser when using the plugin system

[itwork46]

Hello! Thanks for your plugin! But I got a problem. I am using plugin system and getting JS error in Safari (12v & 13v). Please help me fix this.
Here is a screenshot of the error https://prnt.sc/z8t58n

SyntaxError: Unexpected token '='. Expected an opening '(' before a method's parameter list.

And my code:

// Init Anchor Plugin
  class AnchorPlugin extends Scrollbar.ScrollbarPlugin {
    static pluginName = 'anchor';
    onHashChange = () => {
      this.handleHash(location.hash);
    };
    handleHash = (hash) => {
        if (!hash) {
            return;
        }
        if ($(".menu-wrapper .menu-icon").hasClass("nav-active")) {
          $(".menu-icon").trigger("click");
        }
        const FixedHeaderHeight = $('.menu-inner').height();
        if (hash === '#top') {
            scrollbar.setMomentum(0, -scrollbar.scrollTop);
        } else {
            scrollbar.scrollIntoView(document.querySelector(hash), {
              offsetTop: -scrollbar.containerEl.scrollTop + FixedHeaderHeight,
            });
        }
        var uri = window.location.toString();
        if (uri.indexOf("#") > 0) {
            var clean_uri = uri.substring(0, uri.indexOf("#"));
            window.history.replaceState({}, document.title, clean_uri);
        }
    };
    onInit() {
        this.handleHash(location.hash);
        window.addEventListener('hashchange', this.onHashChange);
        this.scrollbar.contentEl.addEventListener('click', this.onClick);
    }
    onDestory() {
        window.removeEventListener('hashchange', this.onHashChange);
        this.scrollbar.contentEl.removeEventListener('click', this.onClick);
    }
  }
  Scrollbar.use(AnchorPlugin);

  // Init Scrollbar Plugin
  class BlockScroll extends Scrollbar.ScrollbarPlugin {
    static pluginName = 'modal';
    static defaultOptions = {
        open: false,
    };
    transformDelta(delta) {
        return this.options.open ? {
            x: 0,
            y: 0
        } : delta;
    }
  }
  Scrollbar.use(BlockScroll);

[idiotWu]

The class field syntax is not yet supported in Safari, so you may need a transpiler like babel, or move the static ... = declarations out of the classes:

// Init Scrollbar Plugin
class BlockScroll extends Scrollbar.ScrollbarPlugin {
  transformDelta(delta) {
      return this.options.open ? {
          x: 0,
          y: 0
      } : delta;
  }
}

BlockScroll.pluginName = 'modal';
BlockScroll.defaultOptions = {
    open: false,
};
  
Scrollbar.use(BlockScroll);