for loop runs infinitely in es5 emit #45598
Description
Bug Report
🔎 Search Terms
transformer,es5,bindings declared in loop initializer
🕗 Version & Regression Information
typescript 4.2.4
yesterday i found my code can't work using transformer provided by ts
- This is a crash
- This changed between versions 3.33 and 4.35
⏯ Playground Link
Playground link with relevant code
💻 Code
// before
function test() {
for (let i = 0; setTimeout(() => console.log(i)), i < 2; setTimeout(() => console.log(i)), i++) {
}
}
// after
`"use strict";\n
function test() {
var _loop_1 = function (i) {
if (inc_1)
setTimeout(function () { return console.log(i); }), i++;
else
inc_1 = true;
if (!(setTimeout(function () { return console.log(i); }), i < 2))
return "break";
};
var inc_1 = false;
for (var i = 0;;) {
var state_1 = _loop_1(i);
if (state_1 === "break")
break;
}
}`
🙁 Actual behavior
variable i keep zero,for loop can't stop
🙂 Expected behavior
it shoulud declarae a variable out of function body and change it in the end of function body and assign it to i before call function ,then the code will work well.