除非使用--no-cache，即使使用babel-jest和.babelrc，Jest也会失败

Question

如果使用--no-cache运行Jest，则此测试通过，但根据下面的错误消息，我不应该使用babel-jest获取错误。

请参阅下面的.babelrc和package.json以及测试文件。

错误：

Using Jest CLI v12.1.1, jasmine2, babel-jest
 FAIL  __tests__/junk-test.js
Runtime Error
  - SyntaxError: Unexpected reserved word in file 'junk.js'.

    Make sure your preprocessor is set up correctly and ensure your 'preprocessorIgnorePatterns' configuration is correct: http://facebook.github.io/jest/docs/api.html#preprocessorignorepatterns-array-string
    If you are currently setting up Jest or modifying your preprocessor, try `jest --no-cache`.
    Preprocessor: node_modules/babel-jest/src/index.js.
    Make sure your '.babelrc' is set up correctly, for example it should include the 'es2015' preset.
    Jest tried to the execute the following preprocessed code:
    var junk = function () {
        return "thing";};

    export { junk };

__测试__ /垃圾test.js

// __tests__/junk-test.js

jest.unmock('../junk.js');

import {junk} from '../junk';


describe('JUNK AwesomeProject', () => {
  it('Junk var = string', () => {
    var retVal = junk();
    expect(retVal).toEqual("thing");
  });
});

junk.js

var junk = function(){
    return "thing";
}

export {junk};

的package.json

{
  "dependencies": {
    "babel-preset-react": "6.5.0",
    "babelify": "7.3.0",
    "react": "15.1.0",
    "react-dom": "15.1.0"
  },
  "devDependencies": {
    "babel-jest": "12.1.0",
    "babel-polyfill": "6.9.0",
    "babel-preset-es2015": "*",
    "jest-cli": "12.1.1",
    "react-addons-test-utils": "15.1.0"
  },
  "scripts": {
    "test": "jest"
  },
  "jest": {
    "verbose": true,
    "unmockedModulePathPatterns": [
      "<rootDir>/node_modules/react/",
      "<rootDir>/node_modules/react-dom/",
      "<rootDir>/node_modules/react-addons-test-utils/"
    ]
  }
}

.babelrc

{
  "presets": ["es2015", "react"]
}

的更新

稀释。将junk.js更改为显式返回，现在测试通过。

奇怪的是Flow并没有抓住这个，也许ESlint会在我的名单上下一个尝试：

var junk = function() { 
   var stuff = "thing"; 
   return stuff; 
}