reactjs - 模块解析失败 : Unexpected token. react-native/index.js "typeof"operator

Question

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？

Answer 1

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。您需要从 react-native 添加一个别名至react-native-web在 webpack.config.js ，所以改用这个包。

关注 React Native for Web documentation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'
        }
    }
}