materio-d8/build/webpack.config.dev.js

'use strict'

const webpack = require('webpack')
const merge = require('webpack-merge')
const baseConfig = require('./webpack.config.base')
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

module.exports = merge(baseConfig, {
  mode: 'development',

  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          process.env.NODE_ENV !== 'production'
            ? 'vue-style-loader'
            : MiniCssExtractPlugin.loader,
          // 'vue-style-loader',
          'css-loader'
        ]
      }, {
        test: /\.scss$/,
        use: [
          process.env.NODE_ENV !== 'production'
            ? 'vue-style-loader'
            : MiniCssExtractPlugin.loader,
          // 'vue-style-loader',
          'css-loader',
          'sass-loader'
        ]
      }
    ]
  },

  plugins: [
    // new webpack.HotModuleReplacementPlugin()
  ]
})