Mailspring/app/internal_packages/attachments/lib/main.es6

import { ComponentRegistry } from 'nylas-exports';
import MessageAttachments from './message-attachments';

export function activate() {
  ComponentRegistry.register(MessageAttachments, { role: 'MessageAttachments' });
}

export function deactivate() {
  ComponentRegistry.unregister(MessageAttachments);
}