storybook/docs/.storybook/webpack.config.js

const path = require('path');

const config = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader'
        ]
      },
      {
        test: /\.yml$/,
        use: [
          'json-loader',
          'yaml-loader'
        ]
      },
      {
        test: /\.(jpg|png|gif|eot|svg|ttf|woff|woff2)$/,
        use: [
          'file-loader'
        ]
      },
    ],
  },
};

module.exports = config;