toPromise

Converts a Future into a Promise.

Note that this conversion may not be as accurate due to the differences in Promise and Future semantics. In particular, Promises recursively flatten any object with a .then method, and do not have a separate representation for cancellations.

Cancelled futures are converted to rejected promises with a special Cancelled() object.

Example:

const Future = require('folktale/concurrency/future');

$ASSERT(
  (await Future.of(1).toPromise()) == 1
);

try {
  await Future.rejected(1).toPromise();
  throw 'never happens';
} catch (e) {
  $ASSERT(e == 1)
}