Question

我正在跟随一个教程，当我尝试建立反应时，我得到一个错误。

Duplicate symbol 'ControlEvent:VerifyReadyDlg/Back/NewDialog/WelcomeDlg/Installed AND PATCH' found. This typically means that an Id is duplicated. Check to make sure all your identifiers of a given type (File, Component, Feature) are unique

我发现了类似的问题，因此我尝试根据此问题进行修复，但无济于事。这是我的webpack.config.js：

Module build failed (from ./node_modules/babel-loader/lib/index.js)
  5 | ReactDOM.render(
> 6 |     <App />,
    |     ^
  7 |     document.getElementById('root')
  8 | );

下面有package.json，module.exports = { entry: './index.js', output:{ path: __dirname, filename: 'bundle.js' }, module:{ rules:[ { test: /\.jsx?$/, loader: 'babel-loader', exclude: '/node_modules/' } ] } }是我在以前的解决方案中找到的。

"devDependencies"

这些是我最初的{ "name": "rtsupport", "version": "1.0.0", "description": "Realtime support frontend", "main": "./index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1", "develop": "webpack --mode development --watch", "build": "webpack --mode development" }, "author": "", "license": "ISC", "dependencies": { "node": "^10.15.2", "react-dom": "^16.8.4" }, "devDependencies": { "@babel/core": "^7.0.0-bridge.0", "babel": "^5.8.23", "babel-core": "^6.26.3", "babel-loader": "^7.1.5", "react": "^16.8.4", "webpack": "^4.29.6", "webpack-cli": "^3.2.3" } }

"devDependencies"

我的节点版本为：v11.10.1

尝试以下建议后：

 "devDependencies": {
    "@babel/core": "^7.3.4",
    "babel": "^5.8.23",
    "babel-core": "^6.26.3",
    "babel-loader": "^8.0.5"
  }

我仍然遇到相同的错误。

Answer 1

<块引用>

这个问题可以通过设置每个babel依赖来解决

<块引用>

>=7.8.7

"devDependencies": {
    "@babel/cli": "^7.13.10",
    "@babel/core": "^7.13.10",
    "@babel/preset-env": "^7.13.10",
    "@babel/preset-react": "^7.12.13",
}

Answer 2

好吧，如果您打算在其中使用JSX，我认为您的webpack测试需要包含.js文件：

test: /\.(js|jsx)$/

Answer 3

使用该配置，您只告诉“翻译” .jsx文件，并且由于您的主文件是index.js，他没有加载该文件，请尝试添加此配置：

以此添加要由加载程序解析的js和jsx文件

rules: [
  {
    exclude: /node_modules/,
    test: /\.js|.jsx?$/,
    use: [
      { loader: 'babel-loader' }
    ]
  }
]

我的错，我以为您有一个babelrc，我忘了您可以使用“ .babelrc”名称在与wepback.config相同的文件夹级别上创建文件，在这里您可以指定加载配置，并告诉babel加载“ react “插件

{
"presets": [
  "stage-0",
  "react",
  "es2015"
],
 "plugins": [
  "transform-class-properties",
  "transform-decorators-legacy",
  "transform-object-rest-spread",
  "transform-es2015-destructuring"
 ],
 "env": {
   "debug": true
 }
}

Answer 4

经过一整天的黑客攻击和浏览，我找到了解决方案。

module:{
        rules:[
            {
                test: /\.jsx?$/,
                exclude: '/node_modules/',
                loader: 'babel-loader',
                query:
                {
                    presets:['react']
                }  
            }
        ]
    }

和package.json部分：

  "devDependencies": {
    "@babel/core": "^7.3.4",
    "babel": "^5.8.23",
    "babel-cli": "^6.26.0",
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-react": "^6.24.1",
    "babel-preset-react-app": "^7.0.2",
    "react": "^16.8.4",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.2.3"
  }

React构建错误：模块构建失败（来自./node_modules/babel-loader/lib/index.js）：

4 个答案: