webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.s(c|a)ss$/,
                use: [
                    'vue-style-loader',
                    'css-loader',
                    {
                        loader: 'sass-loader',
                        // Requires sass-loader@^7.0.0
                        options: {
                            implementation: require('sass'),
                            indentedSyntax: true // optional
                        },
                        // Requires >= sass-loader@^8.0.0
                        options: {
                            implementation: require('sass'),
                            sassOptions: {
                                indentedSyntax: true // optional
                            },
                        },
                    },
                ],
            },
        ],
    }
}