Webpack 在尝试构建 JSX 时抛出错误

Question

SO 上这个问题的答案太多了，我发誓我都试过了。我不确定配置设置有什么问题

我在终端中运行 webpack 时得到的错误：

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是一个js文件，React组件都是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有运行的另一个基本应用程序上运行良好。不确定我在这两个应用程序之间做了什么不同。

Answer 1

我明白了

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

在您的 .babelrc 文件和加载程序选项中。可能有冲突。

Answer 2

您提到您正在使用 webpack.config.cjs 文件，无论如何，Webpack 目前默认不支持该文件：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。

Webpack 在尝试构建 JSX 时抛出错误

Webpack throws error when trying to build JSX

javascript

reactjs

webpack

babeljs

babel-loader