Bug: Jest 20 moduleNameMapper broken

[orangecms]

Do you want to request a feature or report a bug?
bug

What is the current behavior?
Module name is not translated 😢

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

git clone https://github.com/orangecms/jest-meteor-demo/
cd jest-meteor-demo
yarn install && yarn test

works so far. Then:

git checkout jest-20
yarn install && yarn test

breaks with the error message:
Cannot find module 'meteor/mdg:validated-method' from 'fooMethods.spec.js'

What is the expected behavior?
Module name should be translated 🙃

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.
I'm using Jest 19 and tried upgrading to 20 (see the repo for exact versions) - that broke it.
Node: 7.10.0
npm: v4.2.0
yarn: v0.24.5
OS: GNU/Linux

{
  "transform": {
    "^.+\\.jsx?$": "babel-jest"
  },
  "moduleFileExtensions": [
    "js",
    "jsx"
  ],
  "modulePaths": [
    "<rootDir>/node_modules/",
    "<rootDir>/node_modules/jest-meteor-stubs/lib/"
  ],
  "moduleNameMapper": {
    "^(.*):(.*)$": "$1_$2"
  },
  "unmockedModulePathPatterns": [
    "/^imports\\/.*\\.jsx?$/",
    "/^node_modules/"
  ]
}

I have seen other issues here around the mapper, but couldn't solve it with the suggestions there, including #3565 which could be somehow related. I'm not sure though.

[rogeliog]

Thanks for the great and simple repro case... I'm able to reproduce it.

Renaming .jestrc to jest.config.js and chaning the contents of it to use module.exports = {...} makes it work

module.exports = {
 // your same config here
};

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