bitwarden-browser/apps/browser/src/platform/services/browser-messaging-private-mode-background.service.ts

import { MessagingService } from "@bitwarden/common/platform/abstractions/messaging.service";

export default class BrowserMessagingPrivateModeBackgroundService implements MessagingService {
  send(subscriber: string, arg: any = {}) {
    const message = Object.assign({}, { command: subscriber }, arg);
    (window as any).bitwardenPopupMainMessageListener(message);
  }
}