Css loader update

[pekaaw]

MiniCssExtractPlugin now supports HMR, as of April 10, 2019.
Their loader now works in development.

[KieranP]

This is the full JS I use which works great:

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

const mode = process.env.NODE_ENV || 'development';
const prod = mode === 'production';

module.exports = {
  entry: {
    bundle: ['./src/main.js']
  },
  resolve: {
    alias: {
      svelte: path.resolve('node_modules', 'svelte')
    },
    extensions: ['.mjs', '.js', '.svelte'],
    mainFields: ['svelte', 'browser', 'module', 'main']
  },
  output: {
    path: __dirname + '/public',
    filename: '[name].js',
    chunkFilename: '[name].[id].js'
  },
  module: {
    rules: [
      {
        test: /\.svelte$/,
        exclude: /node_modules/,
        use: {
          loader: 'svelte-loader',
          options: {
            emitCss: true,
            hotReload: true
          }
        }
      },
      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: { hmr: !prod }
          },
          'css-loader'
        ]
      }
    ]
  },
  mode,
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[name].[id].css'
    })
  ],
  devtool: prod ? false: 'source-map'
};