Mailspring/app/internal_packages/undo-redo/lib/main.es6

import { ComponentRegistry, WorkspaceStore } from 'mailspring-exports';
import UndoRedoThreadListToast from './undo-redo-thread-list-toast';
import UndoSendStore from './undo-send-store';
import UndoSendToast from './undo-send-toast';

export function activate() {
  UndoSendStore.activate();
  ComponentRegistry.register(UndoSendToast, {
    location: WorkspaceStore.Sheet.Global.Footer,
  });
  if (AppEnv.isMainWindow()) {
    ComponentRegistry.register(UndoRedoThreadListToast, {
      location: WorkspaceStore.Location.ThreadList,
    });
  }
}

export function deactivate() {
  UndoSendStore.deactivate();
  ComponentRegistry.unregister(UndoSendToast);
  if (AppEnv.isMainWindow()) {
    ComponentRegistry.unregister(UndoRedoThreadListToast);
  }
}