Unknown minify bug, causes infinite run

[JSerFeng]

Describe the bug

Simple code that makes SWC hang for ever.

How to reprod ?

Go to the playground link below, then enable compress, you will find browser blocks

Input code

export async function foo() {
  if (undefined_var_1) {
    let replace;
  
    if (undefined_var_2) {
      replace = 1;
    } else {
      replace = 2;
    }
  
    await a({ replace })
  }
}

Config

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "decorators": true,
      "tsx": false
    },
    "target": "es2020",
    "loose": false,
    "minify": {
      "compress": false,
      "mangle": false
    }
  },
  "module": {
    "type": "es6"
  },
  "minify": true,
  "isModule": true
}

Playground link

https://play.swc.rs/?version=1.3.24&code=H4sIAAAAAAAAA22OSwqEMBAF9znFW8albsWzSBM7EAgdiXFUJHf3m9nMbKuKx%2BN1DDGBpk0M7CwmuSCwIegKuwKchZ5lYOuEh%2F5Dsa8fAXhOiDx6Mtye4Ga%2FeVNylBgd6vZGGewn%2FuOb15dZWsidJ%2FX%2BbXKlLp%2FVATGG0ebBAAAA&config=H4sIAAAAAAAAA0WOPQ7DIAxG7%2BKZIcrQgTv0EBZxIioCyHakIsTdC0mqbP5537MrfMSBrZCRhXhUUqLiFyxoySSOfVYwsJBLjJpYwCofZEClQysGodYb5I20h0jmaZ56IKQkdAMGdh%2F9WobepT0ziTwrjFv4k6279rQcY1DPD07nC9rjuM57ed%2Fc6NsPsPYZ%2F8kAAAA%3D

Expected behavior

Normally get result.

Actual behavior

SWC running without error and don't stop.

Version

1.3.24

Additional context

No response

[JSerFeng]

I might have found reason, Enable unused and reduce_vars both will reproduce the problem

[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.