More complex async function example

[zaverden]

Let say I have this function:

function unstableTimeout(n) {
  if (n < 1) throw new Error1()

  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (n < 10) reject(new Error2())
      resolve("done")
    }, n)
  })
}

from polyfill section:

const [error, data] ?= await unstableTimeout(arg1, arg2)
// should become
const [error, data] = await unstableTimeout[Symbol.result](arg1, arg2)

So unstableTimeout[Symbol.result] will return me [Error1, null] or [null, promise] - tuple that is not awaitable.

I just don't understand how it should work. For const [err, data] = unstableTimeout(n), I expect to get in err - Error1, Error2 or null, in data - "done" or null. But provided polyfill does not do this.

Could you please explain more on this matter?

[zaygraveyard]

As noted in "Recursive Handling" of the README, results are recursively handled so unstableTimeout[Symbol.result] will return [Error1, null | undefined], [Error2, null | undefined], or [null, "done"] (as you expect).

The polyfill matches this behavior.