use-hotkeys.js

// useHotkeys.js
import hotkeys from "hotkeys-js";

export const bindHotkeys = (controller) => {
  hotkeys.filter = () => true;

  for (const [hotkey, handler] of Object.entries(
    controller.constructor.hotkeys
  )) {
    hotkeys(hotkey, (e) => controller[handler](e));
  }
};

export const unbindHotkeys = (controller) => {
  for (const hotkey in controller.constructor.hotkeys) {
    hotkeys.unbind(hotkey);
  }
};

// usage
import { bindHotkeys, unbindHotkeys } from "./useHotkeys";

export default class extends Controller {
  static hotkeys = {
    "cmd+b, ctrl+b, cmd+i, ctrl+i, cmd+u, ctrl+u": "handleFormatting",
  };

  connect() {
    bindHotkeys(this)
  }

  disconnect() {
    unbindHotkeys(this)
  }

  handleFormatting(e) {
    // ...
  }
}