How to use the @microsoft/sp-build-web.sass function in @microsoft/sp-build-web

'use strict';

const gulp = require('gulp');
const build = require('@microsoft/sp-build-web');
var merge = require('webpack-merge');

build.sass.setConfig({
    sassMatch: []
});

build.configureWebpack.setConfig({
    additionalConfiguration: function (config) {
        var vueConfig = {
            module: {
                rules: [
                    {
                        test: /\.vue$/,
                        use: [
                            {
                                loader: 'vue-loader',
                                options: {
                                    esModule: true
                                }