插件/预设文件不允许导出对象，只有功能

Posted 2023-03-08

【中文标题】插件/预设文件不允许导出对象，只有功能

【英文标题】：Plugin/Preset files are not allowed to export objects, only functions

【发布时间】：2018-12-19 03:47:15

【问题描述】：

将 react-native 更新为 "^0.56.0" 后出现此错误：

 bundling failed: Error: Plugin/Preset files are not allowed to export objects, only functions. In /Users/ben/vepo/frontend/node_modules/babel-preset-flow/lib/index.js

我尝试做一些类似于此处投票最高的答案，但改为使用 babel-preset-flow：

https://github.com/babel/babel-loader/issues/540

.babelrc:

"presets": ["react-native", "flow", "@babel/preset-flow"]

package.json

  "name": "vepo",
  "version": "0.0.1",
  "private": true,
  "scripts": 
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  ,
  "rnpm": 
    "assets": [
      "./app/fonts"
    ]
  ,
  "jest": 
    "preset": "react-native",
    "moduleNameMapper": 
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
      "\\.(css|less)$": "<rootDir>/__mocks__/styleMock.js"
    
  ,
  "dependencies": 
    "@babel/preset-flow": "^7.0.0-beta.52",
    "@babel/preset-react": "^7.0.0-beta.52",
    "babel-preset-react-native": "^4.0.0",
    "flow-typed": "^2.4.0",
    "generator-rn-toolbox": "^2.2.0",
    "imagemagick": "^0.1.3",
    "immutable": "4.0.0-rc.9",
    "metro-bundler": "^0.22.1",
    "native-base": "^2.3.3",
    "prop-types": "^15.5.10",
    "react": "16.3.1",
    "react-native": "^0.56.0",
    "react-native-aws3": "^0.0.8",
    "react-native-blur": "^3.1.3",
    "react-native-communications": "^2.2.1",
    "react-native-drawer": "^2.3.0",
    "react-native-fbsdk": "facebook/react-native-fbsdk#065507a",
    "react-native-git-upgrade": "^0.2.7",
    "react-native-image-picker": "^0.26.7",
    "react-native-interactable": "^0.1.2",
    "react-native-mail": "^3.0.2",
    "react-native-maps": "^0.16.4",
    "react-native-modal": "^2.3.2",
    "react-native-modalbox": "^1.3.9",
    "react-native-multiple-choice": "^0.0.8",
    "react-native-navigation": "^1.1.100",
    "react-native-off-canvas-menu": "^0.1.31",
    "react-native-optimized-flatlist": "^1.0.1",
    "react-native-redux-router": "^1.0.7",
    "react-native-select-multiple": "^1.0.3",
    "react-native-side-menu": "^0.20.1",
    "react-native-vector-icons": "^4.4.0",
    "react-navigation": "^1.0.0-beta.11",
    "react-redux": "^5.0.3",
    "redux": "^3.6.0",
    "redux-immutable": "^4.0.0",
    "redux-observable": "^0.14.1",
    "reselect": "^3.0.0",
    "rxjs": "^5.2.0",
    "yarn": "^1.3.2",
    "yoga": "^0.0.0"
  ,
  "devDependencies": 
    "adm-zip": "^0.4.7",
    "babel-cli": "^6.26.0",
    "babel-eslint": "^7.1.1",
    "babel-plugin-module-resolver": "^2.7.0",
    "eslint": "^3.17.0",
    "eslint-config-prettier": "^2.9.0",
    "eslint-plugin-flowtype": "^2.30.3",
    "eslint-plugin-jsx": "^0.0.2",
    "eslint-plugin-react": "^6.10.0",
    "eslint-plugin-react-native": "^2.3.1",
    "flow-bin": "^0.72.0",
    "plist": "^2.1.0",
    "react-devtools": "^3.2.1",
    "react-test-renderer": "~15.4.1",
    "redux-devtools": "^3.3.2",
    "remote-redux-devtools": "^0.5.7",
    "remotedev-server": "^0.2.4",
    "xcode": "^1.0.0"
  

没有任何工作。有什么想法吗？

编辑：根本没有 node_modules/babel-preset-flow 文件夹

【问题讨论】：

你能解决这个问题吗？，我有同样的错误:(

@Guille 不，我无法修复这个错误，所以我恢复到 react-native 版本 0.55.4，它对我来说没有错误。

【参考方案1】：

我遇到了同样的错误并通过卸载babel-preset-flow 并安装@babel/preset-flow 解决了它。我相信这是由于 React Native 56 使用 Babel 7。并添加到 .babelrc

  "presets": ["@babel/preset-flow"]

【讨论】：

感谢这也解决了我的问题，为节省我的时间点赞！

谢谢这也解决了我的问题。尝试关注此文档flow.org/en/docs/react

我收到 == 错误：无法从 找到模块 'babel-preset-flow' - 您的意思是“@babel/flow”吗？

【参考方案2】：

升级你的 babel-preset-react-native 依赖。

"babel-preset-react-native": "^5",

您无需安装@babel/preset-react 或@babel/preset-flow。

希望这会有所帮助。

【讨论】：

没有解决我的问题：s 我正在使用排毒，但仍然遇到同样的错误并做出反应0.55.4

【参考方案3】：

打开.babelrc文件，然后编辑代码的presets部分如下：

  "presets": ["module:metro-react-native-babel-preset"],

【讨论】：

在此之后，我遇到了另一个问题，在那里解决了 ***.com/questions/51765313/… ，然后它开始工作了

【参考方案4】：

我通过在我的项目中安装"babel-preset-react-native-stage-0" 解决了这个问题并更改了.babelrc 文件：

"presets": [
    "babel-preset-react-native-stage-0/decorator-support"
  ]

【参考方案5】：

对于 Babel 7 及更高版本，根据 this document 创建一个名为 bable.config.js 而不是 .babelrc 的文件，然后像这样导出预设：

const presets = [
    "flow"
]

module.exports = presets