Incorrectly captured this when destructuring async result

[SarahAnnTolsma]

Describe the bug

When destructuring the result of a call to Promise.all(), the this context is captured incorrectly. This results in a runtime error.

Input code

export class Test
{
    public async bad(): Promise<void>
    {
        let foo = false;

        [ foo ] = await Promise.all(
            [
                this.foo(),
            ]
        );
    }
    
    public async good(): Promise<void>
    {
        let [ foo ] = await Promise.all(
            [
                this.foo(),
            ]);
    }

    private async foo(): Promise<boolean>
    {
        return true;
    }
}

Config

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "tsx": false
    },
    "target": "es2015",
    "loose": false,
    "minify": {
      "compress": false,
      "mangle": false
    }
  },
  "module": {
    "type": "commonjs"
  },
  "minify": false,
  "isModule": true
}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.4.0&code=H4sIAAAAAAAAA7WOQQ6CMBBF95xilpAYDiDqGVy4MywGGLRJZUg7RY3h7kKRGnTjxr9oOv2vk0e3lo1AqdFaOJCV6BHBkNYVWpWA9t6UUGAVJ2vYG74oS5uOVbXz1MSO0SRQM8MWatSWsig0R%2F%2BeDw1eUcm8JUWt4wB5cDGNkbOy6fA7TlaLLg9Tkvlr789v8RPzT%2Bb%2FcAxqk5ZRHQq9vDz%2F1iqYNWHzaWZInGlAjKN5V%2F8EpDjXyrABAAA%3D&config=H4sIAAAAAAAAA1VPSQ7DIAy88wrkcw9tpV76hz4CUSciYhN2pKIofw%2BkkDY3exbPeBFSwkQannIpY1miSoTp2AtC2bP6FAQ4RySdTGS4dJapUoOyhDu0fhlglUbk6kK6X2%2BP5gAbAmF3NMwZb4b8n6mDiwmJzsIqVX60eE4ULRVceM872X6pfWuDcs0FPxH8lD3xuA6GXt3OaUaxbkujvRocAQAA

SWC Info output

No response

Expected behavior

Both the good and bad functions should correctly capture this by using _this.foo() in the call to Promise.all().

Actual behavior

Only good is transpiling correctly, and bad is using this., which will be undefined at runtime due to the use of _async_to_generator.

Version

1.4.0

Additional context

This bug does not exist on 1.3.7

[SarahAnnTolsma]

It looks like this also happens when not using Promise.all, so here is an updated and smaller repro:

export class Test
{
    public async bad(): Promise<void>
    {
        let foo = false;

        [ foo ] = await this.foo();
    }
    
    public async good(): Promise<void>
    {
        let [ foo ] = await this.foo();
    }

    private async foo(): Promise<boolean[]>
    {
        return [ true ];
    }
}

[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.