[Bug Report] Raise error when export default used instead of module.exports

[akki-jat]

What is the current behavior?
Raise error when export default used instead of module.exports.

export default function (css) {
  if (/*@cc_on!@*/false || !!window.document.documentMode) {
    css = css.replace(/var\(--primary-color\)/g, sharedService.primaryColor);
    css = css.replace(/var\(--secondary-color\)/g, sharedService.secondaryColor);
    css = css.replace(/var\(--text-color\)/g, sharedService.textColor);
    css = css.replace(/var\(--grid-col\)/g, sharedService.colsPercentage);
  }

  return css;
} 

If the current behavior is a bug, please provide the steps to reproduce.

Just use export default instead of module.exports

What is the expected behavior?
Should not raise error

Please mention other relevant information such as your webpack version, Node.js version and Operating System.
webpack version : 3.6.0
Node.js version : 8.11.2
OS : Windows 7

Error Screenshots

Currently using this solution

result = typeof options.transform === 'function'
           ? options.transform(obj.css) 
	   : Object.values(options.transform)[0](obj.css);

[alexander-akait]

@akki-jat Looks like a bug, feel free to send PR

[sokra]

Looks like a configuration problem. What's your loader configuration?

[akki-jat]

Hi @sokra, here is my loader configuraion

{
    test: /\.css$/,
    use: [
        {
            loader: 'style-loader',
            options: {
                transform: './transform.js'
             }
          },
          {  loader: 'css-loader'  }
    ]
}

[akki-jat]

@evilebottnawi and @sokra, any response on this?

[alexander-akait]

@akki-jat can you create minimum reproducible test repo?

[akki-jat]

@evilebottnawi yeah.

[akki-jat]

@evilebottnawi here is the repo to reproduce the bug.
https://github.com/akki-jat/style-loader-bug--332

[akki-jat]

Hi @evilebottnawi any progress on this?

[alexander-akait]

@akki-jat right now not, very busy, feel free to investigate and send fix

[akki-jat]

@evilebottnawi I already added fix for this. #333

[akki-jat]

thanks @michael-ciniawsky & @evilebottnawi .