Jest Test Babel Error：不允许插件/预设文件导出对象

Question

我正在使用一个非常新的（2017年12月）堆栈的依赖项。当我尝试使用Jest进行同构反应测试时，测试套装会因以下错误而失败：

* Test suite failed to run
[BABEL] /__tests__/router.test.js: Plugin/Preset files are not allowed to
export objects, only functions.

这是我的依赖项：

"dependencies": {
    "axios": "^0.17.1",
    "babel-polyfill": "^6.26.0",
    "cors": "^2.8.4",
    "express": "^4.16.2",
    "react": "^16.1.1",
    "react-dom": "^16.1.1",
    "react-router-dom": "^4.2.2"
  },
  "devDependencies": {
    "@babel/core": "^7.0.0-beta.35",
    "babel-cli": "^6.26.0",
    "babel-core": "^7.0.0-bridge.0",
    "babel-eslint": "^8.0.2",
    "babel-jest": "^22.0.1",
    "babel-loader": "^7.1.2",
    "babel-preset-env": "^1.6.1",
    "babel-preset-react": "^6.24.1",
    "enzyme": "^3.2.0",
    "enzyme-adapter-react-16": "^1.1.0",
    "enzyme-to-json": "^3.2.2",
    "eslint": "^4.11.0",
    "eslint-plugin-react": "^7.5.1",
    "html-webpack-plugin": "^2.30.1",
    "jest": "^21.2.1",
    "nodemon": "^1.11.0",
    "parallelshell": "^3.0.2",
    "react-test-renderer": "^16.2.0",
    "regenerator-runtime": "^0.11.1",
    "supertest": "^3.0.0",
    "webpack": "^3.8.1",
    "webpack-dev-server": "^2.9.4"
  },
  "peerDependencies": {
    "babel-core": "^7.0.0-0"
  }

.babelrc：

{
  "presets": [
    "env",
    "react",
  ]
}

有没有人对Jest为什么不运行有任何见解？

Answer 1

巴贝尔桥旨在涵盖6到7之间的任何问题

这不是桥接包的100％。它所做的就是允许使用babel-core的工具传递给@babel/core。整个包裹是this single line of code。

如果你使用的是@babel/core，你需要使用适用于Babel 7的插件。这意味着babel-preset-react应该更改为@babel/preset-react，@babel/preset-env也是如此，你的.babelrc应该是：

{
  "presets": [
    "@babel/env",
    "@babel/react",
  ]
}

同样，babel-polyfill应该是@babel/polyfill。

这些都没有得到很好的记录，因为Babel 7仍然是一个不稳定的测试版。

Answer 2

{
    "presets": [
        "env",
        "react"
    ],
    "test": [
        "jest"
    ]
}

将“test”的最后一段代码添加到babel.rc中这是我的.babelrc代码供参考

   {
    "presets": [
        "env",
        "react"
    ],
    "plugins": [
        "transform-class-properties",
        "transform-object-rest-spread"
    ],
    "test": [
        "jest"
    ]
}

这是命令行的输出

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        9.264s
Ran all test suites.
Done in 12.99s.