这是因为webpack-cli版本的变化。

如果webpack-cli版本号小于4。使用webpack-dev-server 如果webpack-cli版本号为4。X或更高，你可以使用webpack服务

3.执行命令webpack-cli。X及以下

    "scripts": {
      "dev-server": "webpack-dev-server"
    }

对于webpack-cli。X及以上

    "scripts": {
      "dev-server": "webpack serve"
    }

    "scripts": {
      "dev-server": "webpack serve "
    }

来源:webpack dev-server

我通过运行npm start来解决这个问题，这只是一个运行“webpack-dev-server”的包装器，而不是直接在控制台运行webpack-dev-server。问题是我把选项传递给了一个我不应该传递选项的方法。

用npm start运行webpack-dev-server显示了正确的错误消息。直接运行webpack-dev-server只给了我“错误:无法找到模块'webpack/bin/config-yargs'”。奇怪。

我在: :“webpack ^ 2.6.1”, :“webpack-dev-server ^ 2.7.1”

尝试将webpack版本改为3.0,web-dev-server版本改为2.7.1

Eg:

"devDependencies": {
    "webpack": "^3.0.0",
    "webpack-cli": "2.0.13",
    "webpack-config-utils": "2.0.0",
    "webpack-dev-server": "^2.7.1",
    "webpack-validator": "2.2.7"
}

更新Webpack版本(和Webpack命令行):

npm install --save-dev webpack webpack-cli webpack-dev-server webpack-merge

如果您不使用上面提到的任何一种，请随意省略。

问题出在webpack-cli的新版本上。如果webpack-cli <= 3。X webpack-dev-server包工作正常。对于webpack-cli >= 4。X，使用NPX webpack serve命令运行本地服务器。

For webpack-cli 3.x:
"scripts": {
  "start:dev": "webpack-dev-server --mode=development"
}

For webpack-cli 4.x:
"scripts": {
  "start:dev": "webpack serve --mode=development"
}

下调webpack-cli

npm install -D webpack-cli@3