webpack 4 vue cli 3 - single js and css output with static name (app.js & app.css)

vue.config.js

//const path = require('path');
const ExtractTextPlugin = require('mini-css-extract-plugin');

module.exports = {
    configureWebpack:{ optimization:{
        splitChunks:false
    }},
    chainWebpack: config => {
      config.output
        .filename('js/[name].js')

      config.plugin('extract-css')
        .use(ExtractTextPlugin, [{
          filename:  'css/[name].css',
          allChunks: true
        }])
    }
  };