为什么webpack dev server不'；更新所有NPM软件包后，我不会看css的变化吗？

它以前工作过，但在我将webpack和webpack dev服务器更新到最新版本后，它似乎停止了监视任何css更改

这些脚本来自package.json。

我以前有“webpack dev server”istead的“webpack service”，但我在某个地方看到webpack dev server不再工作了

 "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1",
        "start": "webpack serve --mode development --hot",
        "build": "webpack --mode production"
    },

插件版本：

"sass": "^1.26.11",
"sass-loader": "^10.0.4",
"style-loader": "^2.0.0",
"webpack": "^5.3.0",
"webpack-cli": "^4.1.0",
"webpack-dev-server": "^3.11.0"

这是我的webpack.config.js。

我添加的所有内容都是devServer东西，我以前没有，一切都正常

const path = require("path")
const HtmlWebpackPlugin = require("html-webpack-plugin")

module.exports = {
    mode: "development",
    entry: "./src/index.js",
    output: {
        path: path.join(__dirname, "/dist"),
        filename: "[name].js",
        sourceMapFilename: "[name].js.map",
    },
    devServer: {
        contentBase: "/dist",
        watchContentBase: true,
        open: true,
        inline: true,
        hot: true,
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: ["babel-loader"],
            },
            {
                test: /\.css$/,
                use: ["style-loader", "css-loader"],
            },
            {
                test: /\.s[ac]ss$/i,
                use: ["style-loader", "sass-loader"],
            },
            {
                test: /\.(jpe?g|png|gif|woff|woff2|eot|ttf|svg)(\?[a-z0-9=.]+)?$/,
                use: [
                    {
                        loader: "url-loader",
                        options: {
                            limit: 100000,
                        },
                    },
                ],
            },
        ],
    },

    plugins: [
        new HtmlWebpackPlugin({
            template: "./src/index.html",
        }),
    ],
}

我很乐意帮忙