TypeScript Version: 2.3.2, 2.4.0-dev.20170518
Code
async function run() {
for await (const i of [1, 2]) {
console.log(i);
}
}
run();Expected behavior:
Typescript generates valid javascript when target is es2017.
Actual behavior:
Typescript generates invalid javascript (notice yield outside of generator):
var __asyncValues = (this && this.__asyncIterator) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator];
return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
};
async function run() {
try {
for (var _a = __asyncValues([1, 2]), _b = yield _a.next(); !_b.done; _b = yield _a.next()) {
const i = _b.value;
console.log(i);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (_b && !_b.done && (_c = _a.return)) yield _c.call(_a);
}
finally { if (e_1) throw e_1.error; }
}
var e_1, _c;
}
run();My tsconfig.json is
{
"compilerOptions": {
"lib": [
"es2017",
"esnext.asynciterable",
"dom"
],
"target": "es2017",
"module": "commonjs"
}
}
TypeScript Version: 2.3.2, 2.4.0-dev.20170518
Code
Expected behavior:
Typescript generates valid javascript when target is
es2017.Actual behavior:
Typescript generates invalid javascript (notice
yieldoutside of generator):My tsconfig.json is
{ "compilerOptions": { "lib": [ "es2017", "esnext.asynciterable", "dom" ], "target": "es2017", "module": "commonjs" } }