| // Copyright (C) 2018 Valerie Young. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-%asyncfromsynciteratorprototype%.next |
| description: next() will unwrap a Promise value return by the sync iterator |
| info: | |
| %AsyncFromSyncIteratorPrototype%.next ( value ) |
| ... |
| 2. Let promiseCapability be ! NewPromiseCapability(%Promise%). |
| ... |
| 5. Let nextResult be IteratorNext(syncIteratorRecord, value). |
| 6. IfAbruptRejectPromise(nextResult, promiseCapability). |
| 7. Let nextDone be IteratorComplete(nextResult). |
| 8. If AbruptRejectPromise(nextDone, promiseCapability). |
| 9. Let nextValue be IteratorValue(nextResult). |
| 10. IfAbruptRejectPromise(nextValue, promiseCapability). |
| ... |
| 14. Let steps be the algorithm steps defined in Async-from-Sync Iterator Value Unwrap Functions. |
| |
| Async-from-Sync Iterator Value Unwrap Functions |
| An async-from-sync iterator value unwrap function is an anonymous built-in |
| function that is used by methods of %AsyncFromSyncIteratorPrototype% when |
| processing the value field of an IteratorResult object, in order to wait for |
| its value if it is a promise and re-package the result in a new "unwrapped" |
| IteratorResult object. Each async iterator value unwrap function has a |
| [[Done]] internal slot. |
| |
| flags: [async] |
| features: [async-iteration] |
| ---*/ |
| |
| function* g() { |
| yield Promise.resolve(1); |
| } |
| |
| async function* asyncg() { |
| yield* g(); |
| } |
| |
| asyncg().next().then(function (result) { |
| assert.sameValue(result.value, 1, "result.value should be unwrapped promise, got: " + result.value) |
| }).then($DONE, $DONE); |