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What?

Fixes a regression with the getServerState and getServerContext functions introduced in #72381.

The bug makes navigation fail when an object obtained from the returned server state/context is also referenced inside the regular state/context. This worked before without issues.

In particular, the problem happens when the regular state/context is updated during navigation. The algorithm uses an internal function called deepMerge, which attempts to add new values if they exist. The objects returned by getServerState and getServerContext are deepReadOnly objects, which throw when anything attempts to modify them. If the algorithm tries to add new values to these objects, navigation fails.

Why?

This bug is critical. When this occurs, the Interactivity API completely breaks and stops working.

How?

The getServerState and getServerContext functions returned deepReadOnly as a measure to prevent any modification of these internal objects. The bug fix changes that, making these functions return regular objects without any modification-prevention logic, but cloning the original ones, so the returned values are always the same.

Testing Instructions

TBD

@DAreRodz DAreRodz added [Type] Bug An existing feature does not function as intended Backport to WP 6.9 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta [Feature] Interactivity API API to add frontend interactivity to blocks. [Package] Interactivity /packages/interactivity labels Nov 19, 2025
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Size Change: +10 B (0%)

Total Size: 2.54 MB

Filename Size Change
build/modules/interactivity/index.min.js 14.9 kB +10 B (+0.07%)
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@t-hamano
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This bug is critical. When this occurs, the Interactivity API completely breaks and stops working.

I would like to confirm if this PR is required for 6.9 RC3, which will be released tomorrow. How urgent is this bug? cc @luisherranz

@luisherranz
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It should be included. I'm about to start reviewing and merge it if everything is fine.

@luisherranz luisherranz marked this pull request as ready for review November 24, 2025 10:25
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The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: DAreRodz <darerodz@git.wordpress.org>
Co-authored-by: luisherranz <luisherranz@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

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LGTM!

Thanks for the fix, David.

I've also added a couple of tests to cover the specific use case of when an object is copied from the server and then attempted to be modified.

@luisherranz luisherranz enabled auto-merge (squash) November 24, 2025 10:29
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Flaky tests detected in 116c0ba.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/19630995671
📝 Reported issues:

@luisherranz luisherranz merged commit bf8215d into trunk Nov 24, 2025
41 checks passed
@luisherranz luisherranz deleted the fix/iapi-get-server-state-context-deepclone branch November 24, 2025 11:00
@github-project-automation github-project-automation bot moved this from 🔎 Needs Review to ✅ Done in WordPress 6.9 Editor Tasks Nov 24, 2025
@github-actions github-actions bot added this to the Gutenberg 22.2 milestone Nov 24, 2025
@t-hamano
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For some reason, the automatic cherry-pick to the 6.9 branch has been skipped. I'll try re-adding the label.

@t-hamano t-hamano added Backport to WP 6.9 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta and removed Backport to WP 6.9 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta labels Nov 24, 2025
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There was a conflict while trying to cherry-pick the commit to the wp/6.9 branch. Please resolve the conflict manually and create a PR to the wp/6.9 branch.

PRs to wp/6.9 are similar to PRs to trunk, but you should base your PR on the wp/6.9 branch instead of trunk.

# Checkout the wp/6.9 branch instead of trunk.
git checkout wp/6.9

# Create a new branch for your PR.
git checkout -b my-branch

# Cherry-pick the commit.
git cherry-pick bf8215d8ec78d5504a486bbde037da2867596cf2

# Check which files have conflicts.
git status

# Resolve the conflict...
# Add the resolved files to the staging area.
git status
git add .
git cherry-pick --continue

# Push the branch to the repository
git push origin my-branch

# Create a PR and set the base to the wp/6.9 branch.
# See https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/changing-the-base-branch-of-a-pull-request.

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There was a conflict while trying to cherry-pick the commit to the wp/6.9 branch. Please resolve the conflict manually and create a PR to the wp/6.9 branch.

@DAreRodz @luisherranz, could you manually submit a backport PR against the wp/6.9 branch?

@luisherranz
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Sure.

luisherranz added a commit that referenced this pull request Nov 24, 2025
…Context` functions (#73437)

* Move `deepClone` to utils

* Stop using `deepReadOnly` in getServer functions

* Update `getServerState` and `getServerContext` e2e tests

* Update `getServerState` and `getServerContext` TSDocs

* Add changelog update

* Remove "read-only" from type tests

* Add e2e test for copying obj from server state

* Add e2e test for copying obj from server context

---------

Co-authored-by: DAreRodz <darerodz@git.wordpress.org>
Co-authored-by: luisherranz <luisherranz@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
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luisherranz added a commit that referenced this pull request Nov 24, 2025
…nd `getServerContext` functions" (#73514)

* iAPI: Return a deep-clone object from `getServerState` and `getServerContext` functions (#73437)

* Move `deepClone` to utils

* Stop using `deepReadOnly` in getServer functions

* Update `getServerState` and `getServerContext` e2e tests

* Update `getServerState` and `getServerContext` TSDocs

* Add changelog update

* Remove "read-only" from type tests

* Add e2e test for copying obj from server state

* Add e2e test for copying obj from server context

---------

Co-authored-by: DAreRodz <darerodz@git.wordpress.org>
Co-authored-by: luisherranz <luisherranz@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

* Update packages/interactivity/CHANGELOG.md

Co-authored-by: Aki Hamano <54422211+t-hamano@users.noreply.github.com>

---------

Co-authored-by: DAreRodz <darerodz@git.wordpress.org>
Co-authored-by: luisherranz <luisherranz@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
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This PR was manually backported into the wp/6.9 branch by #73514.

@t-hamano t-hamano added Backported to WP Core Pull request that has been successfully merged into WP Core and removed Backport to WP 6.9 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta labels Nov 24, 2025
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Backported to WP Core Pull request that has been successfully merged into WP Core [Feature] Interactivity API API to add frontend interactivity to blocks. [Package] Interactivity /packages/interactivity [Type] Bug An existing feature does not function as intended

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4 participants