Version

System:
    OS: macOS 15.5
    CPU: (10) arm64 Apple M1 Max
    Memory: 1.96 GB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Chrome: 137.0.7151.104
    Edge: 137.0.3296.83
    Safari: 18.5
  npmPackages:
    @rslib/core: 0.10.0

Details

External moduled css files get transformed, to use the .js file extension, while a .js file might not even exist.

import pantry from '@org/design-system/design-tokens.module.css';

becomes

import design_tokens_module from "@org/design-system/design-tokens.module.js";

Reproduce link

https://codepen.io/Justineo/pen/yLbxxOR

Reproduce Steps

1. Have an import for a moduled css files from an external library
2. Build library with cssModules enabled