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Lodash: Refactor away from _.mergeWith() #51483

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merged 3 commits into from
Jun 15, 2023
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@tyxla tyxla commented Jun 14, 2023

What?

This PR removes the last usage of Lodash's _.mergeWith() and deprecates the function.

Blocked by #50637 and should be rebased after it lands.

Why?

Lodash is known to unnecessarily inflate the bundle size of packages, and in most cases, it can be replaced with native language functionality. See these for more information and rationale:

How?

Just like we've been doing in other places, we're replacing _.mergeWith() with the deepmerge package.

To ensure we're not merging arrays, we're adding a isMergeableObject: isPlainObject setting that will only merge objects and fully override arrays to preserve the pre-existing behavior.

Testing Instructions

  • Verify global styles continue to work and that user-provided styles override the global ones.
  • Verify all checks are green.

@tyxla tyxla added [Type] Performance Related to performance efforts [Status] Blocked Used to indicate that a current effort isn't able to move forward [Type] Code Quality Issues or PRs that relate to code quality [Package] Edit Site /packages/edit-site labels Jun 14, 2023
@tyxla tyxla self-assigned this Jun 14, 2023
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github-actions bot commented Jun 14, 2023

Size Change: +589 B (0%)

Total Size: 1.4 MB

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ℹ️ View Unchanged
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tyxla commented Jun 14, 2023

Thank you for taking a look, @ntsekouras 🙌
Mind reviewing #50637 as well, since it's a prerequisite of this one?
Thanks a lot! 🙇

Base automatically changed from try/lodash-merge-with-deepmerge to trunk June 14, 2023 10:00
@tyxla tyxla removed the [Status] Blocked Used to indicate that a current effort isn't able to move forward label Jun 14, 2023
@tyxla tyxla merged commit 12a01d5 into trunk Jun 15, 2023
@tyxla tyxla deleted the remove/lodash-merge-with branch June 15, 2023 09:24
@github-actions github-actions bot added this to the Gutenberg 16.1 milestone Jun 15, 2023
sethrubenstein pushed a commit to pewresearch/gutenberg that referenced this pull request Jul 13, 2023
* Lodash: Refactor away from _.mergeWith()

* Add back the comment

* Update package-lock.json
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