Understanding jest-environment-jsdom

[bidoubiwa]

💬 Questions and Help

Hello, I was wondering what exactly jest-environment-jsdom is used for. I use it since apparently its version 25 uses a previous version of js-dom that still supports node 10. But why do I have to use this library instead of a previous version of js-dom?

I see that there is 10m downloads on npm but no readme.

I imagine, if I have to suppose, that it is usefull because jsdom is a sub-dependency and so unless using a yarn.lock to force the sub-dependency to a certain version (which is useless if your project is a library) this library creates an environment that uses a previous version of jsdom.

If this is correct, I would gladly create the README.md in this dir /packages/jest-environment-jsdom as I think it is a really important package that fixes a lot of compatibility issue. It would help a lot of user finding a solution to their failing test, in a period like now for example, where support for node 10 is removed.

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[ahnpnl]

Hi, you should ask in Jest Discord, you will get help easier there

[bidoubiwa]

Hey @ahnpnl, thanks for answering. I looked at the source code and now I'm sure it is used to have an env with a jsdom version used in a previous version of jest.

I still think it is a good idea to add a README as it saved my tests failing in node 10 and other users might have the same issue. Is that a contribution you consider accepting?

linked issue that could be solved by knowing this package:

• globalThis is not defined on Node 10 jsdom/jsdom#2961
• ReferenceError: globalThis is not defined jsdom/jsdom#2795
• Jest26 on Node10 fails with 'ReferenceError: globalThis is not defined' with V8 coverage provider nrwl/nx#3776
• https://stackoverflow.com/questions/60976511/globalthis-underfined-for-jest-test-cases

[ahnpnl]

Probably update this one https://github.com/facebook/jest/blob/master/docs/Configuration.md

cc @SimenB @thymikee

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