SWC breaks on Windows under special conditions

[thetutlage]

Describe the bug

I am using SWC to create a TypeScript loader for Node.js ESM imports. I have narrowed down the problem to bare-minimum in this repo. https://github.com/thetutlage/windows-nodejs-tests

When I run the code in CI (on Windows) and that code includes a class with 4 or more methods, then the process exits with status code 1.

However, the same CI shows code running fine on Linux. Also, if I reduce the number of methods inside src/user.ts file to 3 (instead of 4), then the CI check passes on Windows too.

To be honest, I have no idea why this is happening and downgrading to 1.10.7 works fine in all the cases.

Input code

## Loader code


  const { code, map } = transformSync(source.toString(), {
    sourceMaps: true,
    module: {
      type: 'es6',
    },
    jsc: {
      target: 'esnext',
      parser: {
        syntax: 'typescript',
      },
    },
  })


## Code that breaks


export class User {
  async getId(_: any) {}

  async getName(_: any) {}

  async getEmail(_: any) {}

  async getAllInfo(_: any) {}
}

Config

{
    sourceMaps: true,
    module: {
      type: 'es6',
    },
    jsc: {
      target: 'esnext',
      parser: {
        syntax: 'typescript',
      },
    },
  }

Link to the code that reproduces this issue

https://github.com/thetutlage/windows-nodejs-tests

SWC Info output

No response

Expected behavior

Everything should work fine regardless of the platform

Actual behavior

Breaks on Windows

Version

1.11.24

Additional context

Here is the CI run for Windows. https://github.com/thetutlage/windows-nodejs-tests/actions/runs/14993280948/job/42121468875