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fix(es/helpers): Fix for await (#5458)

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Donny/강동윤 2022-08-14 14:46:07 +09:00 committed by GitHub
parent f9b3870c12
commit b655bf473a
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6 changed files with 98 additions and 28 deletions
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1
crates/swc/tests/exec/git-keep/js/exec.js
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@ -1 +0,0 @@
console.log("Ensure that the directory is tracked by git");

1
crates/swc/tests/exec/git-keep/ts/exec.ts
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@ -1 +0,0 @@
console.log("Ensure that the directory is tracked by git");

10
crates/swc/tests/exec/issues-5xxx/5383/exec.js Normal file
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@ -0,0 +1,10 @@
const a1 = [1, 2, 3];
const a2 = a1.map((x) => Promise.resolve(x));
async function f() {
for await (const v of a2) {
console.log(v);
}
}
f();

51
crates/swc_ecma_transforms_base/src/helpers/_async_iterator.js
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@ -1,17 +1,42 @@
function _asyncIterator(iterable) {
var method;
if (typeof Symbol === "function") {
if (Symbol.asyncIterator) {
method = iterable[Symbol.asyncIterator];
if (method != null) return method.call(iterable);
}
if (Symbol.iterator) {
method = iterable[Symbol.iterator];
if (method != null) return method.call(iterable);
}
var method, async, sync, retry = 2;
for ("undefined" != typeof Symbol && (async = Symbol.asyncIterator, sync = Symbol.iterator); retry--;) {
if (async && null != (method = iterable[async])) return method.call(iterable);
if (sync && null != (method = iterable[sync])) return new AsyncFromSyncIterator(method.call(iterable));
async = "@@asyncIterator", sync = "@@iterator";
}
throw new TypeError("Object is not async iterable");
}
function AsyncFromSyncIterator(s) {
function AsyncFromSyncIteratorContinuation(r) {
if (Object(r) !== r) return Promise.reject(new TypeError(r + " is not an object."));
var done = r.done;
return Promise.resolve(r.value).then(function (value) {
return {
value: value,
done: done
};
});
}
return AsyncFromSyncIterator = function (s) {
this.s = s, this.n = s.next;
}, AsyncFromSyncIterator.prototype = {
s: null,
n: null,
next: function () {
return AsyncFromSyncIteratorContinuation(this.n.apply(this.s, arguments));
},
return: function (value) {
var ret = this.s.return;
return void 0 === ret ? Promise.resolve({
value: value,
done: !0
}) : AsyncFromSyncIteratorContinuation(ret.apply(this.s, arguments));
},
throw: function (value) {
var thr = this.s.return;
return void 0 === thr ? Promise.reject(value) : AsyncFromSyncIteratorContinuation(thr.apply(this.s, arguments));
}
}, new AsyncFromSyncIterator(s);
}

10
crates/swc_ecma_transforms_compat/tests/async-to-generator/issue-5383/1/exec.js Normal file
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@ -0,0 +1,10 @@
const a1 = [1, 2, 3];
const a2 = a1.map((x) => Promise.resolve(x));
async function f() {
for await (const v of a2) {
console.log(v);
}
}
f();

53
packages/swc-helpers/src/_async_iterator.mjs
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@ -1,17 +1,44 @@
export default function _asyncIterator(iterable) {
var method;
if (typeof Symbol === "function") {
if (Symbol.asyncIterator) {
method = iterable[Symbol.asyncIterator];
if (method != null) return method.call(iterable);
}
if (Symbol.iterator) {
method = iterable[Symbol.iterator];
if (method != null) return method.call(iterable);
}
var method, async, sync, retry = 2;
for ("undefined" != typeof Symbol && (async = Symbol.asyncIterator, sync = Symbol.iterator); retry--;) {
if (async && null != (method = iterable[async])) return method.call(iterable);
if (sync && null != (method = iterable[sync])) return new AsyncFromSyncIterator(method.call(iterable));
async = "@@asyncIterator", sync = "@@iterator";
}
throw new TypeError("Object is not async iterable");
}
function AsyncFromSyncIterator(s) {
function AsyncFromSyncIteratorContinuation(r) {
if (Object(r) !== r) return Promise.reject(new TypeError(r + " is not an object."));
var done = r.done;
return Promise.resolve(r.value).then(function (value) {
return {
value: value,
done: done
};
});
}
return AsyncFromSyncIterator = function (s) {
this.s = s, this.n = s.next;
}, AsyncFromSyncIterator.prototype = {
s: null,
n: null,
next: function () {
return AsyncFromSyncIteratorContinuation(this.n.apply(this.s, arguments));
},
return: function (value) {
var ret = this.s.return;
return void 0 === ret ? Promise.resolve({
value: value,
done: !0
}) : AsyncFromSyncIteratorContinuation(ret.apply(this.s, arguments));
},
throw: function (value) {
var thr = this.s.return;
return void 0 === thr ? Promise.reject(value) : AsyncFromSyncIteratorContinuation(thr.apply(this.s, arguments));
}
}, new AsyncFromSyncIterator(s);
}