jest cannot resolve source-map-generator module when using configuration file

[marcus-sa]

🐛 Bug Report

Due to #6509 I decided to go with two different configuration files, one for my main and one for my renderer process in Electron.
Sadly this is causing issues aswell.

To Reproduce

Create a jest configuration file and run it using jest --config=/path/to/config.

Error log

yarn run v1.7.0
$ jest --config=jest.renderer.config.js
 FAIL  src/renderer/components/ProvideHooks.test.tsx
  ● Test suite failed to run

    Cannot find module './lib/source-map-generator' from 'source-map.js'

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:210:17)
      at Object.<anonymous> (node_modules/source-map-support/node_modules/source-map/source-map.js:6:30)

Run npx envinfo --preset jest

System:
    OS: Windows 10
    CPU: x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
  Binaries:
    Yarn: 1.7.0 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 6.1.0 - C:\Program Files\nodejs\npm.CMD

[fnune]

I just solved this issue on my setup. I suppose you're running a TypeScript-only app, here's what I had before:

In package.json#jest:

    "moduleDirectories": [
      "node_modules",
      "app"
    ],
    "moduleFileExtensions": [
      "ts",
      "tsx"
    ]

I assumed I don't need to add js or jsx to moduleFileExtensions, but adding it solves the issue:

In package.json#jest:

    "moduleDirectories": [
      "node_modules",
      "app"
    ],
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx"
    ]

I hope that helps!

[sbstnmsch-zz]

Confirmed. Weird but this fixes the issue. Thank you!

[fnune]

@sbstnmsch I don't find it all that weird: my previous declaration for moduleFileExtensions didn't include js, so Jest tried to resolve source-map-generator.js and didn't find it because I implicitly told it to ignore js files.

[sbstnmsch-zz]

OK understood. I have a typescript-only setup here and forgot about that there still can be js files in the modules. Thanks for clarifying.

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