fix(store): return original reference from updateItems when no elements match

[arturovt]

updateItems always returned a new array clone, even when no element matched the predicate. This caused memoized selectors to see a changed reference and re-evaluate on every no-op call.

Track whether any element was actually updated and return the original array reference unchanged when the predicate matched nothing.

[nx-cloud]

🤖 Nx Cloud AI Fix Eligible

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nx run-many --target=lint --all --configuration...	✅ Succeeded	5s	View ↗
nx lint-types store	✅ Succeeded	3s	View ↗
nx run-many --target=build --all	✅ Succeeded	2s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-03-31 17:32:13 UTC

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commit: bdcf5d7

[bundlemon]

BundleMon

Files updated (1)

Status	Path	Size	Limits
❌	fesm2022/ngxs-store-operators.mjs	15.74KB (+217B +1.36%)	16KB / +0.5%

Unchanged files (5)

Status	Path	Size	Limits
✅	fesm2022/ngxs-store.mjs	111.92KB	114KB / +0.5%
✅	fesm2022/ngxs-store-internals.mjs	13.74KB	15KB / +0.5%
✅	fesm2022/ngxs-store-internals-testing.mjs	10.32KB	13KB / +0.5%
✅	fesm2022/ngxs-store-plugins.mjs	2.37KB	3KB / +0.5%
✅	fesm2022/ngxs-store-experimental.mjs	574B	2KB / +0.5%

Total files change +217B +0.14%

Groups updated (1)

Status	Path	Size	Limits
✅	@ngxs/store(fesm2022)[gzip] ./fesm2022/*.mjs	38.33KB (+30B +0.08%)	+1%

Final result: ❌

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[bundlemon]

BundleMon (NGXS Plugins)

Unchanged files (9)

Status	Path	Size	Limits
✅	Plugins(fesm2022)[gzip] storage-plugin/fesm2022/ngxs-storage-plugin.m js	4.12KB	+0.5%
✅	Plugins(fesm2022)[gzip] router-plugin/fesm2022/ngxs-router-plugin.mjs	3.4KB	+0.5%
✅	Plugins(fesm2022)[gzip] hmr-plugin/fesm2022/ngxs-hmr-plugin.mjs	2.72KB	+0.5%
✅	Plugins(fesm2022)[gzip] websocket-plugin/fesm2022/ngxs-websocket-plug in.mjs	2.58KB	+0.5%
✅	Plugins(fesm2022)[gzip] form-plugin/fesm2022/ngxs-form-plugin.mjs	2.47KB	+0.5%
✅	Plugins(fesm2022)[gzip] devtools-plugin/fesm2022/ngxs-devtools-plugin .mjs	2.23KB	+0.5%
✅	Plugins(fesm2022)[gzip] logger-plugin/fesm2022/ngxs-logger-plugin.mjs	2.03KB	+0.5%
✅	Plugins(fesm2022)[gzip] storage-plugin/fesm2022/ngxs-storage-plugin-i nternals.mjs	947B	+0.5%
✅	Plugins(fesm2022)[gzip] router-plugin/fesm2022/ngxs-router-plugin-int ernals.mjs	453B	+0.5%

No change in files bundle size

Unchanged groups (1)

Status	Path	Size	Limits
✅	All Plugins(fesm2022)[gzip] ./-plugin/fesm2022/.mjs	20.91KB	+0.5%

Final result: ✅

View report in BundleMon website ➡️

---

Current branch size history | Target branch size history

[bundlemon]

BundleMon (Integration Projects)

Unchanged files (1)

Status	Path	Size	Limits
✅	Main bundles(Gzip) hello-world-ng21/dist-integration/browser/mai n-(hash).js	67.33KB	+1%

No change in files bundle size

Final result: ✅

View report in BundleMon website ➡️

---

Current branch size history | Target branch size history

[nineninesevenfour]

Hi! You might have a look at operators/tests/update-items.spec.ts, which seems to have started failing with this MR.