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Await promises from sync iterators with
for-await (#13824)
Co-authored-by: Mickey Rose <lightmare@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| /* @minVersion 7.15.9 */ | ||
|
|
||
| export default function _asyncIterator(iterable) { | ||
| var method, | ||
| async, | ||
| sync, | ||
| retry = 2; | ||
|
|
||
| if (typeof Symbol !== "undefined") { | ||
| async = Symbol.asyncIterator; | ||
| sync = Symbol.iterator; | ||
| } | ||
|
|
||
| while (retry--) { | ||
| if (async && (method = iterable[async]) != null) { | ||
| return method.call(iterable); | ||
| } | ||
| if (sync && (method = iterable[sync]) != null) { | ||
| return new AsyncFromSyncIterator(method.call(iterable)); | ||
| } | ||
|
|
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| async = "@@asyncIterator"; | ||
| sync = "@@iterator"; | ||
| } | ||
|
|
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| throw new TypeError("Object is not async iterable"); | ||
| } | ||
|
|
||
| function AsyncFromSyncIterator(s) { | ||
| AsyncFromSyncIterator = function (s) { | ||
| this.s = s; | ||
| this.n = s.next; | ||
| }; | ||
| AsyncFromSyncIterator.prototype = { | ||
| /* SyncIterator */ s: null, | ||
| /* SyncIterator.[[Next]] */ n: null, | ||
| next: function () { | ||
| return AsyncFromSyncIteratorContinuation(this.n.apply(this.s, arguments)); | ||
| }, | ||
| return: function (value) { | ||
| var ret = this.s.return; | ||
| if (ret === undefined) { | ||
| return Promise.resolve({ value: value, done: true }); | ||
| } | ||
| return AsyncFromSyncIteratorContinuation(ret.apply(this.s, arguments)); | ||
| }, | ||
| throw: function (value) { | ||
| var thr = this.s.return; | ||
| if (thr === undefined) return Promise.reject(value); | ||
| return AsyncFromSyncIteratorContinuation(thr.apply(this.s, arguments)); | ||
| }, | ||
| }; | ||
|
|
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| function AsyncFromSyncIteratorContinuation(r) { | ||
| // This step is _before_ calling AsyncFromSyncIteratorContinuation in the spec. | ||
| if (Object(r) !== r) { | ||
| return Promise.reject(new TypeError(r + " is not an object.")); | ||
| } | ||
|
|
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| var done = r.done; | ||
| return Promise.resolve(r.value).then(function (value) { | ||
| return { value: value, done: done }; | ||
| }); | ||
| } | ||
|
|
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| return new AsyncFromSyncIterator(s); | ||
| } |
12 changes: 12 additions & 0 deletions
12
...async-generator-functions/test/fixtures/for-await/create-async-from-sync-iterator/exec.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| async function* fn() { | ||
| for await (const result of [Promise.resolve("ok")]) { | ||
| return { result }; | ||
| } | ||
| } | ||
|
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| return fn().next().then(result => { | ||
| expect(result).toEqual({ | ||
| done: true, | ||
| value: { result: "ok" } | ||
| }); | ||
| }); |
5 changes: 5 additions & 0 deletions
5
...sync-generator-functions/test/fixtures/for-await/create-async-from-sync-iterator/input.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| async function* fn() { | ||
| for await (const result of [Promise.resolve("ok")]) { | ||
| return { result }; | ||
| } | ||
| } |
6 changes: 6 additions & 0 deletions
6
...-generator-functions/test/fixtures/for-await/create-async-from-sync-iterator/options.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| { | ||
| "plugins": ["proposal-async-generator-functions"], | ||
| "parserOpts": { | ||
| "allowReturnOutsideFunction": true | ||
| } | ||
| } |
35 changes: 35 additions & 0 deletions
35
...ync-generator-functions/test/fixtures/for-await/create-async-from-sync-iterator/output.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| function fn() { | ||
| return _fn.apply(this, arguments); | ||
| } | ||
|
|
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| function _fn() { | ||
| _fn = babelHelpers.wrapAsyncGenerator(function* () { | ||
| var _iteratorAbruptCompletion = false; | ||
| var _didIteratorError = false; | ||
|
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| var _iteratorError; | ||
|
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| try { | ||
| for (var _iterator = babelHelpers.asyncIterator([Promise.resolve("ok")]), _step; _iteratorAbruptCompletion = !(_step = yield babelHelpers.awaitAsyncGenerator(_iterator.next())).done; _iteratorAbruptCompletion = false) { | ||
| const result = _step.value; | ||
| return { | ||
| result | ||
| }; | ||
| } | ||
| } catch (err) { | ||
| _didIteratorError = true; | ||
| _iteratorError = err; | ||
| } finally { | ||
| try { | ||
| if (_iteratorAbruptCompletion && _iterator.return != null) { | ||
| yield babelHelpers.awaitAsyncGenerator(_iterator.return()); | ||
| } | ||
| } finally { | ||
| if (_didIteratorError) { | ||
| throw _iteratorError; | ||
| } | ||
| } | ||
| } | ||
| }); | ||
| return _fn.apply(this, arguments); | ||
| } |
7 changes: 7 additions & 0 deletions
7
...sync-generator-functions/test/fixtures/yield-star/create-async-from-sync-iterator/exec.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| async function* fn() { | ||
| yield* [Promise.resolve("ok")] // CreateAsyncFromSyncIterator | ||
| } | ||
|
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| return fn().next().then(result => { | ||
| expect(result).toEqual({ value: "ok", done: false }); | ||
| }); |
3 changes: 3 additions & 0 deletions
3
...ync-generator-functions/test/fixtures/yield-star/create-async-from-sync-iterator/input.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| async function* fn() { | ||
| yield* [Promise.resolve("ok")] // CreateAsyncFromSyncIterator | ||
| } |
6 changes: 6 additions & 0 deletions
6
...generator-functions/test/fixtures/yield-star/create-async-from-sync-iterator/options.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| { | ||
| "plugins": ["proposal-async-generator-functions"], | ||
| "parserOpts": { | ||
| "allowReturnOutsideFunction": true | ||
| } | ||
| } |
10 changes: 10 additions & 0 deletions
10
...nc-generator-functions/test/fixtures/yield-star/create-async-from-sync-iterator/output.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| function fn() { | ||
| return _fn.apply(this, arguments); | ||
| } | ||
|
|
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| function _fn() { | ||
| _fn = babelHelpers.wrapAsyncGenerator(function* () { | ||
| yield* babelHelpers.asyncGeneratorDelegate(babelHelpers.asyncIterator([Promise.resolve("ok")]), babelHelpers.awaitAsyncGenerator); // CreateAsyncFromSyncIterator | ||
| }); | ||
| return _fn.apply(this, arguments); | ||
| } |
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