How to form createQueryBuilder in typeorm?

Question

ORM

There was such a query in typeorm 0.2 version

const topic = await Topic.query(`
  select
  t.*,
  f.user_id user_followed_id,
  m.user_id user_moderator_id
  from topic t
  left join follow f on f.topic_id = t.id and f.user_id = $1
  left join moderator m on m.topic_id = t.id and m.user_id = $2
  where t.title = $3`;

In version 0.3.2, everything has changed and now they do it according to the documentation

const topic = await AppDataSource
    .getRepository(Topic)
    .createQueryBuilder("topic")
    .getOne()

I can not understand. Please help me with my example.
To understand how to make requests in the future

Thank you all in advance