React Typescript 与 Webpack webpack.config.ts 文件已经存在，mkdir

Question

我正在尝试使用 Typescript 为 React 创建一个模板。

为了在生产环境中使用它，我想将它与 webpack 捆绑在一起。

就我的研究而言，我应该正确配置所有内容。

如下

webpack.config.ts

const path = require('path');

module.exports = {
    mode: "development",
    entry: {
        app: path.join(__dirname, 'src', 'index.tsx')
    },
    target: 'web',
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                use: 'ts-loader',
                include: [
                    path.resolve(__dirname, 'ts')
                ],
            },
            {
                enforce: "pre",
                test: "/\.js$/",
                loader: "source-map-loader"
            }
        ]
    },
    resolve: {
        extensions: [ '.tsx', '.ts', '.js' ],
    },
    output: {
        filename: 'index.js',
        path: path.resolve(__filename, 'js')
    },
    devtool: 'source-map',
};

tsconfig.json

{
    "compilerOptions": {
        "target": "ES6",
        "module": "CommonJS",
        "outDir": "./js/",
        "preserveConstEnums": true,
        "moduleResolution": "Node",
        "sourceMap": true,
        "removeComments": true,
        "jsx": "react"
    },
    "include": [
        "./ts/**/*"
    ]
}

package.json

{
  "name": "reacttest",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "build": "webpack --config webpack.config.ts"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/node": "^14.0.14",
    "@types/react": "^16.9.41",
    "@types/react-dom": "^16.9.8",
    "html-webpack-plugin": "^4.3.0",
    "source-map-loader": "^1.0.0",
    "ts-loader": "^7.0.5",
    "typescript": "^3.9.5",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.12"
  },
  "dependencies": {
    "react": "^16.13.1",
    "react-dom": "^16.13.1"
  }
}

但每次我跑

webpack 

或

webpack --config webpack.config.ts

或

webpack webpack.config.ts

我收到以下错误消息

错误：EEXIST：文件已存在，mkdir '\Some\Path\WebWorkspace\reacttest\webpack.config.ts'

我做错了什么？

都试过了

NodeJs 13.7

和

NodeJs v12.18.1

提前致谢

Answer 1

问题的根本原因是使用 .ts 作为 webpack.config 文件的扩展名。

tsconfig.json 文件指示 Webpack 将所有 .ts 文件包含在处理范围内。这无意中也包含了 webpack.config.ts 文件。

问题可以通过将 webpack.config.ts 文件重命名为 webpack.config.js 来解决。

以下是在 Typescript 中实现 React JS 项目所需的所有文件的工作示例：

1.项目的文件夹结构

react-ui
react-ui/package.json
react-ui/tsconfig.json
react-ui/webpack.config.json

react-ui/src
react-ui/src/index.tsx  ---> Main program

react-ui/www   ---> For static html file and images
react-ui/www/index.html
react-ui/www/images

2。 package.json（包括 webpack、webpack-cli 和 webpack-dev-server）

{
  "name": "react-ui",
  "version": "1.0.0",
  "description": "UI with React and Typescript",
  "main": "index.tsx",
  "scripts": {
    "start": "webpack-dev-server --port 3000 --mode development --hot",
    "build": "webpack --config webpack.config.js"
  },
  "dependencies": {
    "react": "^16.13.1",
    "react-dom": "^16.13.1"
  },
  "devDependencies": {
    "@types/node": "^14.0.13",
    "@types/react": "^16.9.38",
    "@types/react-dom": "^16.9.8",
    "@types/webpack": "^4.41.17",
    "clean-webpack-plugin": "^3.0.0",
    "copy-webpack-plugin": "^6.0.2",
    "css-loader": "^3.6.0",
    "file-loader": "^6.0.0",
    "html-webpack-plugin": "^4.3.0",
    "ignore-emit-webpack-plugin": "^2.0.2",
    "mini-css-extract-plugin": "^0.9.0",
    "ts-loader": "^7.0.5",
    "typescript": "^3.9.5",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.12",
    "webpack-dev-server": "^3.11.0"
  }
}

3. tsconfig.json

{
  "compilerOptions": {
    "outDir": "./dist",
    "target": "es5",
    "module": "es6",
    "jsx": "react",
    "noImplicitAny": true,
    "allowSyntheticDefaultImports": true
  }
}

4. webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const {CleanWebpackPlugin} = require('clean-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');


module.exports = {
    mode: 'none',
    entry: {
        app: path.join(__dirname, 'src', 'index.tsx')
    },
    target: 'web',
    resolve: {
        extensions: ['.ts', '.tsx', '.js']
    },
    plugins: [
        new CleanWebpackPlugin(),
        new MiniCssExtractPlugin({ filename: '[name].css' }),
        new HtmlWebpackPlugin({ template: path.join(__dirname, 'www', 'index.html') }),
        new CopyPlugin({ patterns: [{ from: 'www/images', to: 'www/images' }] })
    ],
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                use: 'ts-loader',
                exclude: '/node_modules/'
            },
            {
                test: /\.css$/,
                use: [MiniCssExtractPlugin.loader, 'css-loader']
            },
            {
                test: /\.(svg|png|jpg|gif|eot|ttf|woff|woff2)$/,
                use: ["file-loader"]
            }          
        ]
    },
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: '[name].js'
    },
    optimization: {
        splitChunks: {
          cacheGroups: {
            styles: {
              name: 'styles',
              test: /\.css$/,
              chunks: 'all',
              enforce: true,
            },
          },
        },
    }
}

如何使用？

启动开发服务器：

> npm start   ---> Starts dev server at port # 3000

生产版本：

> npm run build   --> Creates production ready package in react-ui/dist folder

Answer 2

发现错误：

替换：

path: path.resolve(__filename, 'js')

与：

path: path.resolve(__dirname, 'js')