Question

我现在正在使用webpack v4，试图将webpack-dev-server添加到我的项目中。我在这里面临的问题是，当我运行webpack-dev-server命令时，它在默认浏览器中打开了本地服务器，但不提供已编译的资产，也没有监视文件中的更改。

我还没有实现热模块更换。

这是项目结构

package.json

{
  "name": "webpack-starterkit",
  "version": "1.0.0",
  "description": "webpack starter kit",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack --mode production",
    "dev": "webpack --mode development",
    "start": "webpack-dev-server --mode development --open"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "autoprefixer": "^8.6.3",
    "browser-sync": "^2.24.4",
    "browser-sync-webpack-plugin": "^2.2.2",
    "css-loader": "^0.28.11",
    "mini-css-extract-plugin": "^0.4.0",
    "node-sass": "^4.9.0",
    "postcss-loader": "^2.1.5",
    "sass-loader": "^7.0.3",
    "style-loader": "^0.21.0",
    "webpack": "^4.12.0",
    "webpack-cli": "^3.0.8",
    "webpack-dev-server": "^3.1.4"
  }
}

webpack.config.js

const path = require("path");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const webpack = require("webpack");
module.exports = {
  entry: "./app/src/js/index.js",
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, "app/dist/js"),
    publicPath: "dist/js"
  },
  devServer: {
    contentBase: path.resolve(__dirname, "app/dist"),
    port: 3000,
    hot: true
  },
  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          {
            loader: "style-loader"
          },
          {
            loader: MiniCssExtractPlugin.loader
          },
          {
            loader: "css-loader"
          },
          {
            loader: "postcss-loader"
          },
          {
            loader: "sass-loader"
          }
        ]
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "../css/style.css"
    }),
  ]
};

请帮助我解决问题。

Answer 1

output.path用于设置应用程序的输出目录。

您尝试在"app/dist/js"中输出所有内容，而应将其设置为"app/dist"，然后可以为资产选择特定的输出路径。

要在名为 js 的文件夹中输出javascript捆绑包，可以设置output.filename: "js/bundle.js"。

对于CSS，您可以在 MiniCssExtractPlugin 选项中设置filename: "css/style.css"。

在此示例中，无需设置publicPath（资产将从本地服务器的根目录提供）。

重要：如果您运行生产包，然后将应用程序上传到与服务器根目录不同的文件夹中，则需要相应设置publicPath。

您也不需要任何devServer选项（默认情况下是http://localhost:8080/的用户）。

这是解决方案（我将代码简化了一点），devServer甚至可以处理html文件。

package.json

{
  "name": "webpack-test",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "dev": "webpack --mode=development --devtool=false",
    "start": "webpack-dev-server --mode=development"
  },
  "license": "MIT",
  "devDependencies": {
    "css-loader": "^0.28.11",
    "html-webpack-plugin": "^3.2.0",
    "mini-css-extract-plugin": "^0.4.0",
    "webpack": "^4.12.0",
    "webpack-cli": "^3.0.8",
    "webpack-dev-server": "^3.1.4"
  }
}

webpack.config.js

const path = require("path");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: "./app/src/js/index.js",
  output: {
    path: path.resolve(__dirname, "app/dist"),
    filename: "js/bundle.js"
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          { loader: MiniCssExtractPlugin.loader },
          { loader: "css-loader" }
        ]
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "css/style.css"
    }),
    new HtmlWebpackPlugin({
      template: "./app/src/index.html",
      title: "Test"
    })
  ]
};

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
    <h1>Hello World</h1>
  </body>
</html>

index.js

import "../css/style.css";

console.log("test!");

style.css

body {
  background-color: red;
}

文件夹结构

webpack开发服务器无法构建和重新加载index.html

1 个答案: