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Blocks: Deprecate isValidBlockContent #38794

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merged 3 commits into from
Mar 15, 2022

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@dmsnell dmsnell commented Feb 14, 2022

Description

The isValidBlockContent function attempts to validate a block by
re-generating its output but does so by ignoring any innerBlocks
that might exist. Since blocks can change their output based on the
presence or content of its inner blocks this will lead to incorrect
results from the validator.

validateBlock also makes this mistake however it is fixable since
it requires passing in the block itself (fixable in another patch
once there are no longer two interfaces for what appears to be the
same purpose). isValidBlockContent doesn't pass in the block and
so is fundamentally limited in being able to validate properly.
This limitation also means that we can't rely on isValidBlockContent
once we start threading source information into blocks; that is, as
we improve our ability to catch and fix or preserve issues with the
block markup, this function provides no way forward to incorporate
those updates.

After scouring through the commit logs I was unable to find a clear
purpose for this second validation method and in Core it only seems
to be used as a convenience function for tests. We're deprecating it
in this patch because it's an exposed public interface and it's not
clear if anyone relies on it.

Testing Instructions

There are two testable changes in this PR:

  • Are you aware of external code relying on isValidBlockContent?
    What do we think about the deprecation? Should we schedule removal?
    Should we outright remove it instead?
  • By rewriting the internal tests to use validateBlock we have
    removed the tests and constraints on isValidBlockContent. We could
    preserve them but I want to avoid as much confusion as possible and
    suggest people only use validateBlock.

The only affected code in Core should be the tests, so if they pass
then there's nothing more to test.

Types of changes

As part of ongoing work to preserve existing unrecognized content (via invalid or missing blocks) this patch is deprecating an interface for block validation that overlooks inner blocks and parse failures. Because of this and because of the broader issue the editor has a tendency to corrupt or lose content on save, even for unrelated changes.

This change works to make it easier to account for inner blocks on validation as well as better preservation of those unrecognized bits.

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).
  • I've updated related schemas if appropriate.

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github-actions bot commented Feb 14, 2022

Size Change: +98 B (0%)

Total Size: 1.16 MB

Filename Size Change
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build/blocks/index.min.js 46.5 kB +90 B (0%)
ℹ️ View Unchanged
Filename Size
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compressed-size-action

@gziolo gziolo added [Feature] Block API API that allows to express the block paradigm. [Package] Blocks /packages/blocks [Type] New API New API to be used by plugin developers or package users. labels Feb 15, 2022
@dmsnell dmsnell force-pushed the blocks/deprecate-is-valid-block-content branch 2 times, most recently from 2787918 to a51947f Compare February 15, 2022 20:10
@dmsnell dmsnell force-pushed the blocks/deprecate-is-valid-block-content branch from a51947f to 36336cf Compare February 16, 2022 23:03
dmsnell added a commit that referenced this pull request Feb 22, 2022
Potentially this is a conflict with #38794 and once `isValidBlockContent`
is gone we might be able to remove this change.
@dmsnell dmsnell force-pushed the blocks/deprecate-is-valid-block-content branch from 36336cf to d4998ae Compare February 23, 2022 21:06
@dmsnell dmsnell requested a review from gziolo February 23, 2022 21:06
dmsnell added a commit that referenced this pull request Feb 23, 2022
Potentially this is a conflict with #38794 and once `isValidBlockContent`
is gone we might be able to remove this change.
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@scruffian scruffian left a comment

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LGTM. You might want to wait for a review from someone who is more familiar with the code.

dmsnell added a commit that referenced this pull request Mar 4, 2022
Potentially this is a conflict with #38794 and once `isValidBlockContent`
is gone we might be able to remove this change.
@adamziel
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adamziel commented Mar 8, 2022

I didn't find much on sourcegraph:
https://sourcegraph.com/search?q=context:global+isValidBlockContent&patternType=literal

There were a few matches on the wpdirectory.net, though:
https://wpdirectory.net/search/01FXMXQ0QKRJ5M26G0Q8FYYP8A

CleanShot 2022-03-08 at 15 11 34

Most of them seems like a bundled version of Gutenberg, but I didn't dive super deep into every single one.

Overall, it seems like it isn't a wildly popular function.

What do we think about the deprecation?

👍

Should we schedule removal? Should we outright remove it instead?

It is part of the public API so I'd rather not remove it, even if there aren't many publicly facing results. The way I saw deprecations work in Gutenberg was marking the function as deprecated, which you already did, and then wait at least two Gutenberg versions or longer if needed. A sensible way to proceed here would be to merge this PR, make the change visible on slack, and then create an issue to remove the function later on. Even if it ends up being removed after WP 6.0 is released to give the plugin authors time to adjust, that sounds fine.

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Looks good! Please also add a corresponding changelog entry.

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adamziel commented Mar 8, 2022

also cc @ellatrix @mcsf @noisysocks

@dmsnell dmsnell force-pushed the blocks/deprecate-is-valid-block-content branch from d4998ae to e990701 Compare March 9, 2022 22:39
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dmsnell commented Mar 9, 2022

There were a few matches on the wpdirectory.net, though:

Thanks for looking that up @adamziel! that's a great idea I hadn't considered. looks good then. I didn't suspect we'd find much; still could be some uses out there but I bet the risk is low here.

I added CHANGELOG entries but I don't know what I'm doing, so I added them under Unreleased sections. Would be grateful if someone could review that.

dmsnell added a commit that referenced this pull request Mar 9, 2022
Potentially this is a conflict with #38794 and once `isValidBlockContent`
is gone we might be able to remove this change.
dmsnell added a commit that referenced this pull request Mar 11, 2022
Potentially this is a conflict with #38794 and once `isValidBlockContent`
is gone we might be able to remove this change.
dmsnell added a commit that referenced this pull request Mar 14, 2022
Potentially this is a conflict with #38794 and once `isValidBlockContent`
is gone we might be able to remove this change.
The `isValidBlockContent` function attempts to validate a block by
re-generating its output but does so by ignoring any `innerBlocks`
that might exist. Since blocks can change their output based on the
presence or content of its inner blocks this will lead to incorrect
results from the validator.

`validateBlock` also makes this mistake however it is fixable since
it requires passing in the block itself (fixable in another patch
once there are no longer two interfaces for what appears to be the
same purpose). `isValidBlockContent` doesn't pass in the block and
so is fundamentally limited in being able to validate properly.
This limitation also means that we can't rely on `isValidBlockContent`
once we start threading source information into blocks; that is, as
we improve our ability to catch and fix or preserve issues with the
block markup, this function provides no way forward to incorporate
those updates.

After scouring through the commit logs I was unable to find a clear
purpose for this second validation method and in Core it only seems
to be used as a convenience function for tests. We're deprecating it
in this patch because it's an exposed public interface and it's not
clear if anyone relies on it.
@dmsnell dmsnell force-pushed the blocks/deprecate-is-valid-block-content branch from 2b7bb5b to 7b13d9e Compare March 14, 2022 22:50
@dmsnell dmsnell merged commit 03fd2b6 into trunk Mar 15, 2022
@dmsnell dmsnell deleted the blocks/deprecate-is-valid-block-content branch March 15, 2022 00:05
@github-actions github-actions bot added this to the Gutenberg 12.9 milestone Mar 15, 2022
@bph bph added the Needs Dev Note Requires a developer note for a major WordPress release cycle label Mar 23, 2022
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Labels
[Feature] Block API API that allows to express the block paradigm. Needs Dev Note Requires a developer note for a major WordPress release cycle [Package] Blocks /packages/blocks [Type] New API New API to be used by plugin developers or package users.
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5 participants