React-Native 应用程序中来自 Babel 的未知选项错误
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【中文标题】React-Native 应用程序中来自 Babel 的未知选项错误【英文标题】:Unknown Option error from Babel in React-Native app 【发布时间】:2021-01-21 07:30:18 【问题描述】:我正在使用 typescript 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
其实我之前没有这个错误。我尝试安装react-native-dotenv
软件包,同时安装了metro-react-native-babel-preset
,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'],
;
index.js
/**
* @format
*/
import AppRegistry from 'react-native';
import App from './App';
import name as appName from './app.json';
AppRegistry.registerComponent('main', () => App);
【问题讨论】:
【参考方案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:
import VARIABLE from "react-native-dotenv"
到:
import VARIABLE from "@env"
解决方案的功劳:https://github.com/facebook/react-native/issues/29314 解决方法:https://github.com/goatandsheep/react-native-dotenv/wiki/Migration-Guide
【讨论】:
在需要搜索此错误之前,我查看了迁移指南,但它(也不是自述文件)说需要添加"moduleName": "@env"
。 ***.com/a/65958849/34315 对我来说已经足够了【参考方案2】:
我正在使用 expo 构建一个应用程序并最终遇到了同样的问题。我通过将导入从 'react-native-dotenv'
重命名为 '@env'
来解决此问题,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",
]
;
;
我没有使用module:metro-react-native-babel-preset
,但是如果你使用它,那么我认为你需要将 babel.config.js 更改为
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 expo 的缓存。我的只有在这一步之后才能工作。
expo r -c
【讨论】:
这个以及expo r -c
为我做了。
如何重命名导入?【参考方案3】:
在 2022 年(以及下面列出的版本),babel.config.js
似乎应该只有一个 react-native
项目条目。
module.exports =
presets: ['module:metro-react-native-babel-preset'],
;
但是,您需要确保其他与测试相关的设置正确。例如,您需要在项目的根目录中有一个名为 jest.config.js
的文件,该文件应如下所示。或者,您可以将这些设置添加到package.json
文件中。
// jest.config.js
module.exports =
preset: 'react-native',
setupFilesAfterEnv: [
// 1. specific setup for react-native
'@testing-library/jest-native/extend-expect',
// 2. global setup & mocking for some services:
'./jest.setup.js',
// 3. mocking for more services:
'./__mocks__/react-native-firebase.js',
"./__mocks__/@react-native-community/google-signin.ts",
],
// 4. Exclusinons List:
transformIgnorePatterns: ["node_modules/(?!((jest-)?react-native|@react-native(-community)?)/)"],
"react-native": "0.66.4"
"@testing-library/react-native": "^9.0.0"
"babel-core": "^7.0.0-bridge.0"
"babel-jest": "^27.4.6"
"jest": "^27.4.7"
"metro-react-native-babel-preset": "^0.66.2"
【讨论】:
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