faux-webpack-config-sass.js

// let's suppose here you have a general configuration that exports the path to sources like this
// get the node modules path
const nodemodules = path.join(cwd, 'node_modules');
const includePaths = [nodemodules, ]

module.exports = {
  module: {
    rules: [
      {
        test: /\.s[ac]ss$/i,
        use: [
          'style-loader',
          'css-loader',
          {
            loader: 'sass-loader',
            options: {
              sassOptions: {
                includePaths: includePaths,
              },
            },
          },
        ],
      },
    ],
  },
};