Mailspring/app/internal_packages/activity/lib/activity-mailbox-perspective.es6

import { WorkspaceStore, MailboxPerspective } from 'mailspring-exports';

export default class ActivityMailboxPerspective extends MailboxPerspective {
  sheet() {
    return WorkspaceStore.Sheet.Activity;
  }
  threads() {
    return null;
  }
  canReceiveThreadsFromAccountIds() {
    return false;
  }
  unreadCount() {
    return 0;
  }
}