chore(react-core): internalize fast-deep-equal (KNO-13810)

[kylemcd]

Description

Internalizes fast-deep-equal in @knocklabs/react-core and drops the runtime dependency. It is reimplemented as a small internal deepEqual (the default non-ES6 behavior: recursive comparison of primitives, plain objects, arrays, Date, and RegExp; no Map/Set special-casing).

What changed

• Added packages/react-core/src/modules/core/deepEqual/ — a dedicated folder containing the deepEqual util.
• Repointed the single import in useStableOptions.ts.
• Added packages/react-core/test/core/deepEqual.test.ts covering primitives, NaN, nested objects/arrays, key-order independence, differing key counts, array-vs-object, Date, and RegExp.
• Dropped fast-deep-equal from packages/react-core/package.json and updated the lockfile.

fast-deep-equal remains in the lockfile only as a transitive dependency of ajv — it is no longer a direct dependency of ours.

Why: Part of the npm supply chain hardening effort. @knocklabs/react-core is published, so dropping the dependency also removes it from every consumer's install graph.

Linear: KNO-13810

---

Stack (bottom → top) — npm supply chain hardening:

1. chore(react): remove clsx dependency (KNO-13814) #1020 — remove clsx from @knocklabs/react
2. chore(client): internalize jwt-decode (KNO-13812) #1021 — internalize jwt-decode in @knocklabs/client
3. chore(react): internalize lodash.debounce (KNO-13811) #1022 — internalize lodash.debounce in @knocklabs/react
4. chore(react-core): internalize fast-deep-equal (KNO-13810) #1023 — internalize fast-deep-equal in @knocklabs/react-core ◀ this PR

Checklist

• Tests have been added (test/core/deepEqual.test.ts) and useStableOptions.test.ts passes against the internalized deepEqual.

[linear-code]

KNO-13810

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
javascript-ms-teams-connect-example	Ready	Preview, Comment	Jun 17, 2026 2:39pm
javascript-nextjs-example	Ready	Preview, Comment	Jun 17, 2026 2:39pm
javascript-slack-connect-example	Ready	Preview, Comment	Jun 17, 2026 2:39pm
javascript-slack-kit-example	Ready	Preview, Comment	Jun 17, 2026 2:39pm

[kylemcd]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• chore(react-core): internalize fast-deep-equal (KNO-13810) #1023 👈 (View in Graphite)
• chore(react): internalize lodash.debounce (KNO-13811) #1022
• chore(client): internalize jwt-decode (KNO-13812) #1021
• chore(react): remove clsx dependency (KNO-13814) #1020
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[changeset-bot]

🦋 Changeset detected

Latest commit: d69399c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@knocklabs/react-core	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[kylemcd]

Combined into #1024.

[codecov]

Codecov Report

❌ Patch coverage is 97.56098% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.58%. Comparing base (29f99c5) to head (d69399c).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ges/react-core/src/modules/core/deepEqual/index.ts	97.43%	1 Missing ⚠️

Additional details and impacted files

@@                                             Coverage Diff                                              @@
##           kyle-kno-13811-internalize-lodashdebounce-in-knocklabsreact-and-drop-the    #1023      +/-   ##
============================================================================================================
- Coverage                                                                     63.64%   63.58%   -0.07%     
============================================================================================================
  Files                                                                           210      211       +1     
  Lines                                                                         10081    10157      +76     
  Branches                                                                       1303     1329      +26     
============================================================================================================
+ Hits                                                                           6416     6458      +42     
- Misses                                                                         3640     3678      +38     
+ Partials                                                                         25       21       -4     

Files with missing lines	Coverage Δ
...ct-core/src/modules/core/hooks/useStableOptions.ts	100.00% <100.00%> (ø)
...ges/react-core/src/modules/core/deepEqual/index.ts	97.43% <97.43%> (ø)

... and 10 files with indirect coverage changes