为什么我的更改不显示在浏览器中？Webpack 和 HMR 带或不带 webpack-dev-server。第一个 webpack 配置

Question

我是webpack的新手，想要一个简单的配置，可以将我的SCSS，HTML和JS更改重新加载到浏览器中。我已经阅读了有关在style-loader配置中使用options: { hmr: true }选项的信息，以及使用webpack-dev-server来执行此操作。我的更改导致重新编译成功，但我必须重新加载浏览器才能看到更改。这正是我理解的HMR的目的。

这是我的 webpack 配置：

// webpack v4
const path = require('path');
// update from 23.12.2018
const nodeExternals = require('webpack-node-externals');
// const ExtractTextPlugin = require('extract-text-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
module.exports = {
  entry: { main: './src/index.js' },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].[hash].js'
  },
  target: 'node', // update from 23.12.2018
  externals: [nodeExternals()], // update from 23.12.2018
  module: {
    rules: [
      {
        test: /.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /.scss$/,
        use: [
          // { loader: 'style-loader', options: { hmr: true } },
          'style-loader',
          MiniCssExtractPlugin.loader,
          'css-loader',
          'postcss-loader',
          'sass-loader'
        ]
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    new MiniCssExtractPlugin({
      filename: 'style.[hash].css'
    }),
    new HtmlWebpackPlugin({
      inject: false,
      hash: true,
      template: './src/index.html',
      filename: 'index.html'
    })
  ]
};

我尝试的最新方法是运行(根据本指南 https://medium.freecodecamp.org/how-to-combine-webpack-4-and-babel-7-to-create-a-fantastic-react-app-845797e036ff(：

node_modules/.bin/webpack-dev-server --mode development --open --hot --history-api-fallback

由于我在网络上找不到任何类似的问题，我认为这与我的配置有关。

这是我的package.json：

{
  "name": "webpack-4-tutorial",
  "version": "1.0.0",
  "description": "test",
  "main": "index.js",
  "license": "MIT",
  "private": false,
  "devDependencies": {
    "@babel/core": "^7.4.3",
    "@babel/preset-env": "^7.4.3",
    "autoprefixer": "^9.5.1",
    "babel-loader": "^8.0.5",
    "clean-webpack-plugin": "^2.0.1",
    "css-loader": "^2.1.1",
    "extract-text-webpack-plugin": "^4.0.0-beta.0",
    "html-webpack-plugin": "^3.2.0",
    "mini-css-extract-plugin": "^0.6.0",
    "node-sass": "^4.11.0",
    "postcss-loader": "^3.0.0",
    "precss": "^4.0.0",
    "sass-loader": "^7.1.0",
    "style-loader": "^0.23.1",
    "stylelint": "^10.0.1",
    "stylelint-config-recommended": "^2.2.0",
    "webpack": "^4.30.0",
    "webpack-cli": "^3.3.1",
    "webpack-dev-server": "^3.3.1",
    "webpack-node-externals": "^1.7.2"
  },
  "scripts": {
    "dev": "webpack --mode development --watch",
    "build": "webpack --mode production"
  }
}

最初根据本指南创建了配置文件，但它没有超出 webpack --watch 标志。

提前谢谢。

Answer 1

您是否尝试过直接添加到 web pack.config 文件中的 devServer 配置对象中？

        devServer: {
            hot: true,
        }