How to use this with p-lazy?

[pastelmind]

I want a Promise that is cancelable and whose executor is lazily evaluated. Is this possible by composing p-cancelable with p-lazy?

At the moment it seems impossible. If I wrap p-lazy with p-cancelable...

const cancelable = new PCancelable((outerResolve, outerReject, onCancel) => {
  const lazy = new PLazy((innerResolve, innerReject) => {
    // Our executor logic goes here
    // use innerResolve, innerReject, onCancel
  })
  lazy.then(outerResolve, outerReject) // Oops
})

...it would no longer be lazy, because calling lazy.then() triggers the executor. On the other hand, if I wrap p-cancelable with p-lazy...

const lazy = new PLazy((outerResolve, outerReject) => {
  const cancelable = new PCancelable((innerResolve, innerReject, onCancel) => {
    // Our executor logic goes here
    // use innerResolve, innerReject, onCancel
  })
  cancelable.then(outerResolve, outerReject)
})

...then we cannot cancel it because lazy does not have a .cancel() method.

[sindresorhus]

No, they don't work with each other. In general, the community is moving towards AbortController (with all its flaws) instead of cancellable promises, so it may be worth adopting that instead in your code.

[pastelmind]

Thanks. I suppose I could roll my own implementation.