Wrong transpilation: return inside while from ES5-transpiled generator/async functions

[mlcui-corp]

Describe the bug

return obj; inside a while in ES5-transpiled generators are not being transpiled to return [2, obj];, potentially causing infinite loops. As async functions are transpiled using generators, this also affects async functions.

(Thank you oka@chromium.org for finding this bug: https://crrev.com/c/4659623)

Input code

async function asyncWhile() {
    while (true) {
        return {};
    }
}

function* generatorWhile() {
    while (true) {
        return {};
    }
}

Config

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "tsx": false
    },
    "target": "es5",
    "loose": false,
    "minify": {
      "compress": false,
      "mangle": false
    }
  },
  "module": {
    "type": "es6"
  },
  "minify": false,
  "isModule": true
}

Playground link

https://play.swc.rs/?version=1.3.66&code=H4sIAAAAAAAAA0ssrsxLVkgrzUsuyczPU0gEccMzMnNSNTQVqrkUgKAcxFPQKCkqTYUJgUBRaklpUZ5Cda01WKiWq5aLC2aMlkJ6al5qUWJJfhG5ZgEALxL9bJgAAAA%3D&config=H4sIAAAAAAAAA1WPSw7DIAwF9zkF8rrbdtE79BCIOhERP9mOVBTl7oUE0maH3xszsA5KwcwGnmotxzIkTYx0ziXhHER%2FSgKSE7IhmwRuvRWu1agd4x5tRwOiaUKpW8j3hoOLkbHjLfM22DH%2FC030iZD5ClZUh8nhVTc0Jfj4XvayfaQ%2B9tA%2F4Ad12XkxWH71TaEFh%2B0LYuVI0xQBAAA%3D

Expected behavior

Both functions in the example immediately return an empty object after calling .next() / awaiting.

Actual behavior

Both functions in the example run infinitely.

Version

1.3.66

Additional context

No response

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.