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Downgrade Jest to 24 #18376

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merged 1 commit into from Mar 24, 2020
Merged

Downgrade Jest to 24 #18376

merged 1 commit into from Mar 24, 2020

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acdlite
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@acdlite acdlite commented Mar 24, 2020

There's a bug where toEqual throws when comparing readonly properties, which affects our JSX matchers.

jestjs/jest#9575

The bug is fixed in master, but not yet released.

Until then, downgrading to 24.

@acdlite acdlite requested a review from gaearon March 24, 2020 17:05
@facebook-github-bot facebook-github-bot added CLA Signed React Core Team Opened by a member of the React Core Team labels Mar 24, 2020
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gaearon commented Mar 24, 2020

Not sure it's going to be that easy due to jsdom changes. The upgrade was rather involved: #17896.

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codesandbox-ci bot commented Mar 24, 2020 •
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Latest deployment of this branch, based on commit a622dad:

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@acdlite
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acdlite commented Mar 24, 2020

Wonderful.

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acdlite commented Mar 24, 2020

@SimenB Do you mind doing a patch release for jestjs/jest#9575?

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sizebot commented Mar 24, 2020 •
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No significant bundle size changes to report.

Size changes (stable)

Generated by 🚫 dangerJS against a622dad

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sizebot commented Mar 24, 2020 •
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No significant bundle size changes to report.

Size changes (experimental)

Generated by 🚫 dangerJS against a622dad

@acdlite
Revert "Upgrade to jest 25 (facebook#17896)"
a622dad 
This reverts commit cf00812.

The changes to the test code relate to changes in JSDOM that come with Jest 25:

* Several JSDOM workarounds are no longer needed.
* Several tests made assertions to match incorrect JSDOM behavior (e.g. setAttribute calls) that JSDOM has now patched to match browsers.
  * https://codesandbox.io/s/resets-value-of-datetime-input-to-fix-bugs-in-ios-safari-1ppwh
* JSDOM no longer triggers default actions when dispatching click events.
  * https://codesandbox.io/s/beautiful-cdn-ugn8f
* JSDOM fixed (jsdom/jsdom#2700) a bug so that calling focus() on an already focused element does not dispatch a FocusEvent.
* JSDOM now supports passive events.
* JSDOM has improved support for custom CSS properties.
  * But requires jsdom/cssstyle#112 to land to support webkit prefixed properties.
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acdlite commented Mar 24, 2020

Fortunately cf00812 reverts pretty cleanly. I thought it was a big diff but it's mostly only yarn.lock changes.

@acdlite acdlite mentioned this pull request Mar 24, 2020
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sebmarkbage commented Mar 24, 2020 •
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Did you test if the bugfix actually fixes all the things? The fix doesn't seem fully correct to me. E.g. what happens if we implement a setter that throws instead of freezing. Which we do sometimes.

@acdlite
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acdlite commented Mar 24, 2020

It fixes comparing JSX. I tested with toMatchRenderedOutput. What are the other things?

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acdlite commented Mar 24, 2020

Oh you mean the fix in master, not the revert. I didn't test that, no.

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Comparing SyntheticEvent might fail.

react/packages/legacy-events/SyntheticEvent.js

Line 271 in 30a998d

warn(action, 'This is effectively a no-op');

@acdlite acdlite merged commit fc7835c into facebook:master Mar 24, 2020
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SimenB commented Mar 24, 2020

@SimenB Do you mind doing a patch release for jestjs/jest#9575?

I don't have publish access, only FB employees do. You can try to ping @scotthovestadt or @DiZy internally? Or @cpojer might be able to

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gaearon commented Mar 25, 2020

Sorry for inconvenience @SimenB, I just followed up with our team and you should have access to all packages now.

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SimenB commented Mar 25, 2020

Cool, thanks! I've published 25.2.0 now.

Did you test if the bugfix actually fixes all the things? The fix doesn't seem fully correct to me. E.g. what happens if we implement a setter that throws instead of freezing. Which we do sometimes.

This probably isn't fixed though, maybe open up an issue with a test that fails which should pass?

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gaearon commented Apr 2, 2020

Current blocker: jestjs/jest#9745

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SimenB commented Apr 3, 2020

25.2.7 published with fix for ^. Thanks for the help landing it @gaearon!

gaearon added a commit to gaearon/react that referenced this pull request Apr 3, 2020
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Revert "Revert "Upgrade to jest 25 (facebook#17896)" (facebook#18376)"
ea41676 
This reverts commit fc7835c.
@gaearon gaearon mentioned this pull request Apr 3, 2020
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gaearon added a commit that referenced this pull request Apr 3, 2020
@gaearon
Update to Jest 25 (#18480)
a8f2165 
* Revert "Revert "Upgrade to jest 25 (#17896)" (#18376)"

This reverts commit fc7835c.

* Other fixes

* Fix a broken test
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@acdlite @gaearon @sizebot @sebmarkbage @SimenB @bvaughn @facebook-github-bot