Webpack 在尝试构建 JSX 时抛出错误答案

【问题标题】：Webpack throws error when trying to build JSXWebpack 在尝试构建 JSX 时抛出错误
【发布时间】：2023-03-04 04:03:01
【问题描述】：

关于这个问题有很多答案，我发誓我都试过了。我不确定配置设置有什么问题

我在终端运行 webpack 时遇到的错误：

ERROR in ./src/index.js 13:8
Module parse failed: Unexpected token (13:8)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
|     // const store = createStore(reducers, {}, applyMiddleware(ReduxThunk));
|     return (
>         <HomeShell/>
|     );
| };

我的 index.js

import "@babel/polyfill";
import React from 'react';
import ReactDOM from 'react-dom';
import HomeShell from "./HomeShell";

const Root  = () => {

    return (
        <HomeShell/>
    );
};


ReactDOM.render(<Root />, document.getElementById('#main'));

^^ HomeShell 是带有 React Components 的 js 文件，都是 js 文件。

我的 webpack.config.cjs

import path from 'path';

module.exports = {
    entry: ["@babel/polyfill", "./src/index.js"],
    output: {
        path: path.resolve(__dirname, 'public'),
        filename: 'bundle.js'

    },
    target: "web",
    mode: 'production',
    module: {
        rules: [
            {
                test: /\.m?js$/,
                include: /src/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ["@babel/preset-env", "@babel/preset-react"]
                    }
                }
            },
            {
                test: /\.css$/,
                include: /node_modules/,
                loader: ['style-loader', 'css-loader'],
            }
        ]
    },
};

我的.babelrc

{
  "presets": ["@babel/preset-env", "@babel/preset-react"]
}

我的 package.json

{
  "name": "site name here",
  "version": "1.0.0",
  "description": "site desc",
  "main": "index.js",
  "type": "module",
  "repository": {
    "type": "git",
    "url": "git url"
  },
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "issues url"
  },
  "homepage": "readme url",
  "dependencies": {
    "@babel/polyfill": "^7.10.1",
    "@types/express": "^4.17.6",
    "axios": "^0.19.2",
    "body-parser": "^1.19.0",
    "express": "^4.17.1",
    "nodemailer": "^6.4.5",
    "path": "^0.12.7",
    "react": "^16.13.0",
    "react-dom": "^16.13.0",
    "react-redux": "^7.2.0",
    "react-router": "^5.1.2",
    "react-router-dom": "^5.1.2",
    "redux": "^4.0.5"
  },
  "devDependencies": {
    "@babel/cli": "^7.8.4",
    "@babel/core": "^7.9.0",
    "@babel/preset-env": "^7.9.0",
    "@babel/preset-react": "^7.9.4",
    "babel-loader": "^8.1.0",
    "css-loader": "^3.5.3",
    "file-loader": "^5.1.0",
    "html-loader": "^1.1.0",
    "html-webpack-plugin": "^4.3.0",
    "image-webpack-loader": "^3.6.0",
    "style-loader": "^1.2.1",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.11"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "rm -rf dist && mkdir dist && webpack && babel server -s -d dist",
    "clean": "rm -rf dist",
    "production": "npm run build && node bin/production",
    "start": "npm run production"
  }
}

我远不是 react/webpack/babel 方面的专家，但这个确切的设置似乎在我正在运行的另一个基本应用程序上运行良好。不知道我在这两个应用程序之间做了什么不同。

【问题讨论】：

您确定您的webpack.config.cjs 正在加载吗？如果你在里面放一个console.log，它会打印出来吗？
@loganfsmyth 你是对的。它没有被加载。我没有意识到新的 .cjs 结尾需要在终端/构建脚本的 --config 选项中传递它。一切都很好。如果您作为答案发布，我会接受它

标签： javascript reactjs webpack babeljs babel-loader

【解决方案1】：

您提到您正在使用webpack.config.cjs 文件，无论如何，Webpack 默认不支持该文件：https://github.com/webpack/webpack-cli/issues/1165

您需要显式传递 --config webpack.config.cjs 选项才能加载此文件。

【讨论】：

【解决方案2】：

我明白了

{
  "presets": ["@babel/preset-env", "@babel/preset-react"]
}

在您的.babelrc 文件以及加载程序选项中。可能有冲突。

【讨论】：

刚刚删除了我的webpack.config.cjs的加载器选项中的预设选项，仍然得到同样的错误。
与我拥有的其他配置相比，我看到的唯一可以帮助的是在您的 .babelrc 文件中使用它 { "presets": [ "@babel/env", "@babel/react" ] } 而不是 { "presets": ["@babel/preset-env", "@babel/preset-react"] }