Next 6 breaks styled-jsx with sass plugin

• [X ] I have searched the issues of this repository and believe that this is not a duplicate.

Expected Behavior

Should be able to upgrade next 6 and still use styled-jsx with sass

Current Behavior

Working with next 5.1.0 upgrading to next 6 breaks importing a scss file to be used in styled-jsx example

import style from ‘./componentName.scss’;

in component: <styled jsx>{style}</style>

On next 6 I get ‘style is undefined’

package.json “extract-text-webpack-plugin”: “^3.0.2”, “extracted-loader”: “^1.0.3”, “node-sass”: “^4.7.2”, “postcss”: “^6.0.16”, “postcss-cssnext”: “^3.0.2”, “postcss-loader”: “^2.0.10”, “sass-loader”: “^6.0.6”, “styled-jsx-css-loader”: “^0.3.0” “styled-jsx-plugin-sass”: “^0.2.2”, “autoprefixer”: “^8.2.0”,

babelrc

  "presets": [
    [
      "next/babel",
      {
       "preset-env": { "modules": "commonjs" }
      }
    ]
  ],
  "plugins": [
    [
      "styled-jsx/babel",
      { "plugins": [
          ["styled-jsx-plugin-sass", {
              "sassOptions": {
                "includePaths": ["./styles"],
                "precision": 2
              }
            }
          ]
        ]
      }
    ]
  ]
}
```

next.config.js
```const ExtractTextPlugin = require('extract-text-webpack-plugin');

const dev = process.env.NODE_ENV !== 'production';
const path = require('path');
const getRoutes = require('./routes');

module.exports = {
  exportPathMap: getRoutes,
  webpack: (config) => {
    config.module.rules.push({
      test: /\.scss$/,
      use: [
        {
          loader: 'emit-file-loader',
          options: {
            name: 'dist/[path][name].[ext]',
          },
        },
        'babel-loader',
        'styled-jsx-css-loader',
        'postcss-loader',
      ],
    });
    return config;
  },
};```
## Steps to Reproduce (for bugs)
<!--- Provide a link to a live example, or an unambiguous set of steps to -->
<!--- reproduce this bug. Include code to reproduce, if relevant -->
1.
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## Context
<!--- How has this issue affected you? What are you trying to accomplish? -->
<!--- Providing context helps us come up with a solution that is most useful in the real world -->

## Your Environment
<!--- Include as many relevant details about the environment you experienced the bug in -->
| Tech    | Version |
|---------|---------|
| next    |    6     |
| node    |      8.10.0   |
| OS      |    mac and windows     |
| browser |         |
| etc     |         |

[rashidul0405]

You may check this package: https://github.com/zeit/next-plugins/tree/master/packages/next-sass

[blackbing]

@giuseppeg it looks pass. https://github.com/blackbing/styled-jsx/commit/0feb15f5be267571583a459033bdb6696cef9c80 or do I miss something?