import scss file with Storybook

There is simple code for main.js in Storybook 6, and it works fine for me!

const path = require('path');

// Export a function. Accept the base config as the only param.
module.exports = {
  stories: [...],
  addons:[...],
  webpackFinal: async (config, { configType }) => {
    // `configType` has a value of 'DEVELOPMENT' or 'PRODUCTION'
    // You can change the configuration based on that.
    // 'PRODUCTION' is used when building the static version of storybook.

    // Make whatever fine-grained changes you need
    config.module.rules.push({
      test: /\.scss$/,
      use: ['style-loader', 'css-loader?url=false', 'sass-loader'],
      include: path.resolve(__dirname, '../'),
    });

    // Return the altered config
    return config;
  },
};

For those running storybook on Create React App, adding MiniCssExtractPlugin to .storybook/webpack.config.jon solved my problem loading sass files:

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = function({ config }) {
  config.module.rules.push({
    test: /\.scss$/,
    loaders: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader'],
    include: path.resolve(__dirname, '../')
  });

  config.plugins.push(new MiniCssExtractPlugin({ filename: '[name].css' }))

  return config;
};

Credits to Nigel Sim!

It worked just by adding a webpack.config.js quite similar to my existing one :

const path = require('path')

module.exports = {
    module: {
     rules: [
     {
        test: /\.scss$/,
        loaders: ['style-loader', 'css-loader', 'sass-loader'],
        include: path.resolve(__dirname, '../')
     },
     {  test: /\.css$/,
        loader: 'style-loader!css-loader',
        include: __dirname
     },
     {
        test: /\.(woff|woff2)$/,
        use: {
          loader: 'url-loader',
          options: {
            name: 'fonts/[hash].[ext]',
            limit: 5000,
            mimetype: 'application/font-woff'
          }
         }
     },
     {
       test: /\.(ttf|eot|svg|png)$/,
       use: {
          loader: 'file-loader',
          options: {
            name: 'fonts/[hash].[ext]'
          }
       }
     }
   ]
 }
}