webpack.config.js

module.exports = {
    rules: {
        test: /\.sass$/,
        use: [
            "vue-style-loader",
            "css-loader",
            {
                loader: "sass-loader",
                options: {
                    sassOptions: {
                        indentedSyntax: true
                    }
                }
            }
        ]
    }
};