【问题标题】:Module parse failed: Unexpected token. react-native/index.js "typeof" operator模块解析失败:意外的令牌。 react-native/index.js "typeof" 运算符
【发布时间】:2025-12-10 15:45:01
【问题描述】:

我对前端很陌生 - 试图在 React 上实现客户端。添加“react-native”依赖并运行webpack 后,我收到以下错误:

ERROR in ./node_modules/react-native/index.js 13:7
Module parse failed: Unexpected token (13:7)
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
| 'use strict';
| 
> import typeof AccessibilityInfo from './Libraries/Components/AccessibilityInfo/AccessibilityInfo';
| import typeof ActivityIndicator from './Libraries/Components/ActivityIndicator/ActivityIndicator';
| import typeof Button from './Libraries/Components/Button';
 @ ./node_modules/@react-navigation/native/lib/module/useBackButton.js 2:0-43 5:25-36
 @ ./node_modules/@react-navigation/native/lib/module/index.js
 @ ./src/main/js/app.js

我在 package.json 中有以下依赖项:

 "dependencies": {
    "@react-native-community/masked-view": "^0.1.7",
    "@react-navigation/native": "^5.1.4",
    "@react-navigation/stack": "^5.2.9",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-native": "^0.62.1",
    "react-native-gesture-handler": "^1.6.1",
    "react-native-reanimated": "^1.7.1",
    "react-native-safe-area-context": "^0.7.3",
    "react-native-screens": "^2.4.0",
    "rest": "^2.0.0"
  },
  "scripts": {
    "watch": "webpack --watch -d"
  },
  "devDependencies": {
    "@babel/core": "^7.9.0",
    "@babel/preset-env": "^7.9.0",
    "@babel/preset-react": "^7.9.4",
    "babel-loader": "^8.1.0",
    "webpack": "^4.42.1",
    "webpack-cli": "^3.3.11"
  }

我假设“typeof”运算符无法识别,但为什么呢?

【问题讨论】:

    标签: reactjs react-native webpack node-modules typeof


    【解决方案1】:

    我只花了几个小时来处理这个确切的问题。

    首先,您可以尝试将"@babel/preset-flow" 添加到您的.babelrc 文件中(安装后)。这是推荐的here,但实际上对我没有用。

    对我有用的只是将externals: { "react-native": true }, 添加到我的webpack.config.js 文件中。我的配置文件最终看起来像这样:

    const path = require("path")
    
    module.exports = {
        entry: "./src/index.js",
        output: {
            filename: "main.js",
            path: path.resolve(__dirname, "dist"),
        },
        externals: {
            "react-native": true,
        },
        module: {
            rules: [
                {
                    test: /\.(js|jsx)$/,
                    exclude: /node_modules/,
                    use: ["babel-loader"],
                },
                // ...
            ],
        },
    }
    

    我的理解是react-native 是一个依赖项,因此@babel/preset-flow 实际上并没有被触发来帮助解释这些文件中的flow 格式 - 它可能只处理您的主要"entry" 位置中的文件webpack.config.js 文件。

    希望这可以帮助那里的人。如果我有点偏离基础,请随时评论这个答案,我会更新这个:)

    【讨论】:

      【解决方案2】:

      你尝试在浏览器中运行 React Native 吗?如果是,我建议使用React Native for Web

      react-native 无法在浏览器中运行。您需要在webpack.config.js 中添加一个从react-nativereact-native-web 的别名,所以改用这个包。

      React Native for Web documentation 之后,您需要对您的 webpack 配置进行此修改:

      // webpack.config.js
      module.exports = {
          // ...the rest of your config
      
          resolve: {
              alias: {
                  'react-native$': 'react-native-web'
              }
          }
      }
      

      【讨论】: