async constructor functions in TypeScript?

I have some setup I want during a constructor, but it seems that is not allowed

Which means I can't use:

How else should I do this?

Currently I have something outside like this, but this is not guaranteed to run in the order I want?

async function run() {
  let topic;
  debug("new TopicsModel");
  try {
    topic = new TopicsModel();
  } catch (err) {
    debug("err", err);
  }

  await topic.setup();

A constructor must return an instance of the class it 'constructs'. Therefore, it's not possible to return Promise and await for it.

You can:

-
Make your public setup async.

-
Do not call it from the constructor.

-
Call it whenever you want to 'finalize' object construction.

async function run() 
{
    let topic;
    debug("new TopicsModel");
    try 
    {
        topic = new TopicsModel();
        await topic.setup();
    } 
    catch (err) 
    {
        debug("err", err);
    }
}

Stack Overflow Q#35743426, score: 112