Question

为什么在运行npx run dev时会出现“找不到模块”错误？

在运行“ npx run dev”之前

我处理了这个

运行npm init命令 Webpack webpack-cli安装配置webpack.conifig.js 设置package.json 节点升级创建client.jsx WordRelay.jsx组件文件的创建等。

webpack.conifig.js

const path = require('path');

module.exports = {
    name:'wordrelay-setting',
    mode:'development',
    devtool:'eval',
    resolve:{
        extensions:['.js','.jsx']
    },

    entry:{
        app:['./client']
    }, // 입력

    output: {
        path:path.join(__dirname,'dist'),
        filename:'app.js'
    },  // 출력

};

package.json

{
  "name": "lecture",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "webpack"
  },
  "author": "hyun",
  "license": "ISC",
  "dependencies": {
    "react": "^16.8.6",
    "react-dom": "^16.8.6"
  },
  "devDependencies": {
    "webpack": "^4.37.0",
    "webpack-cli": "^3.3.6"
  }
}

和github： https://github.com/hyunsokstar/react_game_prac2

Answer 1

您运行webpack，但不让webpack知道它应该采用什么配置。因此它将以默认配置运行。将entry设置为src/index.js的情况。您需要运行webpack并将其指向您的配置文件（文件名不正确，因此请对其进行修复）。

另一个问题是，您在代码中使用了jsx，但是没有使用babel将jsx编译为js。因此，您需要向项目中添加babel。

最后一个问题是您在client.jsx文件中有一些错误语法。

package.json

{
  "name": "lecture",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "webpack --config webpack.config.js"
  },
  "author": "hyun",
  "license": "ISC",
  "dependencies": {
    "react": "^16.8.6",
    "react-dom": "^16.8.6"
  },
  "devDependencies": {
    "@babel/core": "^7.5.5",
    "babel-loader": "^8.0.6",
    "babel-preset-react-app": "^9.0.0",
    "webpack": "^4.37.0",
    "webpack-cli": "^3.3.6"
  },
  "babel": {
    "presets": [
      "react-app"
    ]
  }
}

webpack.config.js

const path = require('path');
process.env.NODE_ENV='development';

module.exports = {
    name:'wordrelay-setting',
    mode:'development',
    devtool:'eval',
    resolve:{
        extensions:['.js','.jsx']
    },

    entry:{
        app:['./client']
    }, // 입력

    output: {
        path:path.join(__dirname,'dist'),
        filename:'app.js'
    },  // 출력

    module: {
        rules: [
          {
            test: /\.(js|jsx)$/,
            exclude: /node_modules/,
            use: {
              loader: "babel-loader"
            }
          }
        ]
    }
}

client.jsx

const React = require('react');
const ReactDom = require('react-dom');

const WordRelay = require('./WordRelay')
React.render(<WordRelay />, document.querySelector('#root'));

原始答案

使用此命令npx run dev时。您正在执行run模块。这就是为什么您得到错误。正确的命令应该是

npm run dev

Difference between npx and npm?

为什么在运行npx run dev时出现“找不到模块”错误？

1 个答案: