Error when running Jest: EISDIR: illegal operation on a directory

[betfix]

🐛 Bug Report

Jest throws an error:

Error: EISDIR: illegal operation on a directory, realpath 'Z:\Temp'
    at Function.realpathSync.native (fs.js:1588:3)
    at tryRealpath (D:\myproject\node_modules\jest-util\build\tryRealpath.js:26:39)
    at getCacheDirectory (D:myproject\node_modules\jest-config\build\getCacheDirectory.js:89:33)

The error disappears after going to node_modules\jest-config\build\Defaults.js and replacing line:
cacheDirectory: (0, _getCacheDirectory.default)(),
with:
cacheDirectory: 'Z:\\temp',

To Reproduce

• Download ImDisk Toolkit for Windows (or perhaps other RAM disk tool), make a RAM disk (e.g. Z) and set Windows %TEMP% and %TMP% environment variables to a directory on this disk (e.g. Z:\temp)
• Create a node project, install Jest and try to run a Jest test

Expected behavior

Jest should run a test.

Link to repl or repo (highly encouraged)

https://github.com/betfix/temp-jest-error

envinfo

  System:
    OS: Windows 10 10.0.18363
    CPU: (4) x64 Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz
  Binaries:
    Node: 12.13.0 - D:\Program Files\nodejs\node.EXE
    Yarn: 1.17.3 - D:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 6.12.0 - D:\Program Files\nodejs\npm.CMD
  npmPackages:
    jest: ^26.6.3 => 26.6.3

[git-commit]

I have the same issue on my system.
Project created with create-react-app and a Ramdisk with environment variables set by ImDisk as such:

TEMP=R:\Temp
TMP=R:\Temp

[SimenB]

I don't have access to a windows machine, so can't really do anything here. But swallowing EISDIR in https://github.com/facebook/jest/blob/54420eb51baecaba7dff293770f8cb2579825731/packages/jest-util/src/tryRealpath.ts#L14-L16 seems reasonable? Can you test it?

[tophf]

@SimenB, yes, your idea works e.g. if (error.code !== 'ENOENT' && error.code !== 'EISDIR') {

[SimenB]

great, wanna send a PR?

[tophf]

Probably not as I feel kinda intimidated by the amount of steps in PR guide as well as the need for CLA. Not soon'ish anyway.

[SimenB]

#13157

[github-actions]

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