我正在使用最新的（2017年12月）依赖项堆栈。当我尝试使用Jest进行同构反应测试时，测试服不断失败并显示以下错误：
* 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": …