Fix cart blocks crash on corrupt localStorage cart cache by soroush5 · Pull Request #68372 · woocommerce/woocommerce

soroush5 · 2026-09-04T08:56:14Z

Submission Review Guidelines:

I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
I have checked to ensure there aren't other open Pull Requests for the same update/change.
I have reviewed my code for security best practices.

Changes proposed in this Pull Request:

persistenceLayer.get() called JSON.parse on the cached cart with no guard. One corrupt storeApiCartData value threw at store creation and on page load, killing cart/checkout/mini-cart rendering. Now returns null so the store falls back to defaults and re-fetches — the same best-effort philosophy the set method in the same file already documents.

How to test the changes in this Pull Request:

With a valid cart session, set localStorage.storeApiCartData to {corrupt-json.
Load a page with the cart block: it renders (re-fetches) instead of crashing.
Run pnpm --filter=@woocommerce/block-library test:js -- persistence-layer.

Testing that has already taken place:

Ran the fixed file in Node with stubbed storage: corrupt value returns null, valid JSON returns the parsed object. New Jest regression test added (could not run the suite locally, leaving it to CI).

Milestone

Automatically assign milestone for the next WooCommerce version

github-actions · 2026-09-04T08:56:54Z

Testing Guidelines

Hi ,

Apart from reviewing the code changes, please make sure to review the testing instructions (Guide) and verify that relevant tests (E2E, Unit, Integration, etc.) have been added or updated as needed.

Reminder: PR reviewers are required to document testing performed. This includes:

🖼️ Screenshots or screen recordings.
📝 List of functionality tested / steps followed.
🌐 Site details (environment attributes such as hosting type, plugins, theme, store size, store age, and relevant settings).
🔍 Any analysis performed, such as assessing potential impacts on environment attributes and other plugins, conducting performance profiling, or using LLM/AI-based analysis.

⚠️ Within the testing details you provide, please ensure that no sensitive information (such as API keys, passwords, user data, etc.) is included in this public issue.

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plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/test/index.ts

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📝 Walkthrough

Walkthrough

The cart persistence layer now returns null when cached data is invalid or inaccessible. The cart item check defaults a missing count to zero. Tests cover cache reads, storage errors, and typed cart mocks. A changelog records the fix.

Changes

Cart persistence

Layer / File(s)	Summary
Cache parsing and validation `plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/persistence-layer.ts`, `plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/test/persistence-layer.js`, `plugins/woocommerce/changelog/68370-fix-cart-persistence-corrupt-cache`	`persistenceLayer.get()` catches errors across the cache-read flow and returns `null`. Valid cached cart data remains supported. Tests cover corrupt JSON, valid data, and localStorage access errors. The changelog records the fix.
Cart state fallback and test typing `plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/index.ts`, `plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/test/index.ts`	`hasItemsInCachedCart` treats a missing or null `itemsCount` as zero. Tests use `Cart` assertions and updated event-handler types. Mock loading uses `jest.requireActual`.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 8841e

Corrupt or unreadable cached cart data can fall back to a cart request; no actionable merge risk remains in the reviewed changes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: preventing cart blocks from crashing when the localStorage cart cache is corrupt.
Description check	✅ Passed	The description directly explains the corrupt cart cache issue, the persistence-layer fix, testing steps, and regression coverage.
Linked Issues check	✅ Passed	The changes satisfy [`#68370`]. `persistenceLayer.get()` catches localStorage read and JSON parse failures and returns `null`. The parsed-value object guard remains in place. `hasItemsInCachedCart` hand…
Out of Scope Changes check	✅ Passed	The persistence change, fallback handling, regression tests, type fixes, and changelog entry support [`#68370`]. No unrelated change appears in the reviewed change summary.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4…

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Actionable comments posted: 1

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Inline comments:
In
`@plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/persistence-layer.ts`:
- Line 47: Update persistenceLayer.get() to explicitly return Cart | null, and
narrow or validate the parsed value as Cart before returning it so
cachedCart?.itemsCount remains type-safe.

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📒 Files selected for processing (3)

plugins/woocommerce/changelog/68370-fix-cart-persistence-corrupt-cache
plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/persistence-layer.ts
plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/test/persistence-layer.js

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ralucaStan · 2026-09-11T14:19:14Z

There are no warnings anymore, closing the issue.

soroush5 · 2026-09-11T14:26:36Z

Understood, thanks for checking. The issue is still open on my side, so happy to rebase if it becomes relevant again.

ralucaStan · 2026-09-11T14:27:16Z

@soroush5 my bad, I meant to close another issue. I'll add my comments on the PR now

ralucaStan

Thank you @soroush5 for working on this. I left a few comments, I think we could be more cautios and wrap the whole get. What do you think?

soroush5 · 2026-09-11T14:37:52Z

Good call — done. get() is now wrapped as a whole, so a throwing localStorage and a corrupt value both fall back to null, mirroring set(). Verified with a Jest test that fails before and passes after.

ralucaStan

the try catch change looks good but there are still TS errors introduced by the PR

tjcafferkey · 2026-09-22T15:11:13Z

@soroush5 let me know if you have a problem with the requested changes. Looks like this is almost ready for approval?

soroush5 · 2026-09-22T17:59:57Z

Thanks for the detailed TS report. Fixed both: the test mocks now cast the partial objects to Cart, and the itemsCount check uses nullish coalescing so undefined is handled. tsc is clean on these files. The jest runner fails here on a pre-existing global-mocks issue (same failure with my changes stashed), so I could not run the suite locally, but CI should confirm. The changelog suggestion is applied too if you still want it.

soroush5 · 2026-09-23T09:19:21Z

Thanks for the lint fix on the test file, that is cleaner than my cast. Let me know if anything else needs a touch.

tjcafferkey

LGTM now thank you for addressing the feedback :)

Addressed feedback and has been rereviewed

soroush5 · 2026-09-23T11:14:25Z

Thanks for merging, and for the lint cleanup on the test file. Happy to help again.

Fix cart blocks crash on corrupt localStorage cart cache

fdde9cb

soroush5 requested a review from a team as a code owner September 4, 2026 08:56

soroush5 requested review from ralucaStan and removed request for a team September 4, 2026 08:56

woocommercebot requested review from a team and gigitux and removed request for a team September 4, 2026 08:56

github-actions Bot added type: community contribution plugin: woocommerce Issues related to the WooCommerce Core plugin. labels Sep 4, 2026

coderabbitai Bot reviewed Sep 4, 2026

View reviewed changes

Comment thread plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/persistence-layer.ts Resolved

Fix Cart return contract on persistence layer get

03a959b

ralucaStan closed this Sep 11, 2026

ralucaStan reopened this Sep 11, 2026

ralucaStan reviewed Sep 11, 2026

View reviewed changes

Comment thread plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/persistence-layer.ts Resolved

Comment thread plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/persistence-layer.ts Resolved

Wrap the whole persistence get in try/catch

49bbd42

ralucaStan previously requested changes Sep 11, 2026

View reviewed changes

Comment thread plugins/woocommerce/changelog/68370-fix-cart-persistence-corrupt-cache Resolved

Comment thread plugins/woocommerce/client/blocks/packages/public-api/block-data/cart/persistence-layer.ts Resolved

gigitux removed their request for review September 17, 2026 06:56

tjcafferkey self-requested a review September 22, 2026 15:06

fix TS errors from Cart|null return contract

97c8abf

Fix linting in test file

8841eb8

tjcafferkey approved these changes Sep 23, 2026

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tjcafferkey merged commit 9217024 into woocommerce:trunk Sep 23, 2026
36 checks passed

github-actions Bot added this to the 11.3.0 milestone Sep 23, 2026

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