来自 React-Native 应用程序中的 Babel 的未知选项错误

Question

我正在用打字稿构建一个 react-native 应用程序，以便学习 react native。一旦我使用 expo start 运行应用程序并尝试在模拟器上运行，我就会收到此错误：

index.js: [BABEL] ......../index.js: Unknown option: .name. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options

其实我以前没有这个错误。我尝试安装react-native-dotenv包，同时也安装metro-react-native-babel-preset了它，我不确定是否已经安装。

我的 package.json 如下：

{
 "name": "mobile-app",
 "version": "0.0.1",
 "private": true,
 "scripts": {
   "android": "react-native run-android",
   "ios": "react-native run-ios",
   "start": "react-native start",
   "test": "jest",
   "lint": "eslint . --ext .js,.jsx,.ts,.tsx"
 },
 "dependencies": {
   "@react-native-community/async-storage": "^1.12.0",
   "@react-native-community/google-signin": "^4.0.3",
   "@types/axios": "^0.14.0",
   "axios": "^0.20.0",
   "expo": "^38.0.10",
   "react": "16.13.1",
   "react-native": "0.62.2"
 },
 "devDependencies": {
   "@babel/core": "^7.8.4",
   "@babel/runtime": "^7.8.4",
   "@react-native-community/eslint-config": "^1.1.0",
   "@types/jest": "^25.2.3",
   "@types/react-native": "^0.63.2",
   "@types/react-native-dotenv": "^0.2.0",
   "@types/react-test-renderer": "^16.9.2",
   "@typescript-eslint/eslint-plugin": "^2.27.0",
   "@typescript-eslint/parser": "^2.27.0",
   "babel-jest": "^25.1.0",
   "eslint": "^6.5.1",
   "jest": "^25.1.0",
   "react-native-clean-project": "^3.4.0",
   "react-native-dotenv": "^2.4.1",
   "react-test-renderer": "16.13.1",
   "typescript": "^3.8.3"
 },
 "jest": {
   "preset": "react-native",
   "moduleFileExtensions": [
     "ts",
     "tsx",
     "js",
     "jsx",
     "json",
     "node"
   ]
 }
}

babel.config.js :

module.exports = {
  presets: ['module:metro-react-native-babel-preset', 'module:react-native-dotenv'],
};

索引.js

/**
 * @format
 */

import { AppRegistry } from 'react-native';
import App from './App';
import { name as appName } from './app.json';

AppRegistry.registerComponent('main', () => App);

Answer 1

原来问题与react-native-dotenv设置有关。将 babel.config.js 更改为：

module.exports = {
  presets: ['module:metro-react-native-babel-preset'],
  plugins: [
    ["module:react-native-dotenv", {
      "moduleName": "@env",
      "path": ".env",
      "blacklist": null,
      "whitelist": null,
      "safe": false,
      "allowUndefined": true
    }]
  ]
};

还将导入语句从：更改 import {VARIABLE} from "react-native-dotenv" 为： import {VARIABLE} from "@env"

归功于解决 方案：https :
//github.com/facebook/react-native/issues/29314
解决方案：https :
//github.com/goatandsheep/react-native-dotenv/wiki/Migration-Guide

Answer 2

我正在用 expo 构建一个应用程序，但最终遇到了同样的问题。我通过将导入重命名为'react-native-dotenv'to解决了这个问题'@env'，然后将我的 babel.config.js 更改为

module.exports = function(api) {
  api.cache(true);
  return {
    presets: ['babel-preset-expo'],
    plugins: [
      "module:react-native-dotenv",
    ]
  };
};

我没用过module:metro-react-native-babel-preset但是如果你用了，那我觉得你需要把 babel.config.js 改成

module.exports = {
  presets: ["module:metro-react-native-babel-preset"],
  plugins: [
    "module:react-native-dotenv"
  ]
};

在这些更改之后，在终端中使用以下命令重置博览会的缓存。我的只有在这一步之后才起作用。

expo r -c