I'm using a very up-to-date (December 2017) stack of dependencies. As I try-out isomorphic react tests with Jest, the test suit keeps failing with the following error:

* Test suite failed to run

[BABEL] /__tests__/router.test.js: Plugin/Preset files are not allowed to

export objects, only functions.

Here are my dependencies:

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,

  ]

}

Does anyone have any insights as to why Jest won't run?