Can't use promises or async functions on end event

[hyperh]

Having trouble acquiring db connection (using knex) on end event callback.

Async and promises work in other places of my code though.

.babelrc

{
  "presets": ["node6","stage-0"],
  "plugins": ["transform-async-to-generator"]
}

Code

  lr.on('end', async () => {
    const [header, ...users] = lines;
    await insertUsersToDb(db, users);
    debug(`Finished reading ${users.length} users from ${path}.`);
  });