feat(store): error in dev mode when selectSignal selector returns new reference with identical value

[arturovt]

In dev mode, selectSignal now logs a console.error when a selector returns a new object reference with the same JSON value as the previous result. This usually means the selector is missing memoization and is causing unnecessary downstream recomputations.

The check uses Object.is(a, b) to avoid warning for properly memoized selectors that already return the same reference.

The equal function still always returns false so recomputation continues to propagate normally, keeping the warning accurate for all state updates.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 563ea6e

Command	Status	Duration	Result
nx run-many --target=test --all --configuration...	✅ Succeeded	1m 15s	View ↗
nx run-many --target=lint --all --configuration...	✅ Succeeded	3s	View ↗
nx lint-types store	✅ Succeeded	<1s	View ↗
nx run-many --target=build --all	✅ Succeeded	1m 11s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-05-07 20:19:56 UTC

[bundlemon]

BundleMon

Files updated (1)

Status	Path	Size	Limits
❌	fesm2022/ngxs-store.mjs	115.91KB (+748B +0.63%)	114KB / +0.5%

Unchanged files (5)

Status	Path	Size	Limits
✅	fesm2022/ngxs-store-operators.mjs	15.7KB	16KB / +0.5%
✅	fesm2022/ngxs-store-internals.mjs	12.7KB	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 +748B +0.47%

Groups updated (1)

Status	Path	Size	Limits
✅	@ngxs/store(fesm2022)[gzip] ./fesm2022/*.mjs	39.47KB (+235B +0.58%)	+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	2.78KB	+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	20.96KB	+0.5%

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[bundlemon]

BundleMon (Integration Projects)

Files updated (1)

Status	Path	Size	Limits
✅	Main bundles(Gzip) hello-world-ng21/dist-integration/browser/mai n-(hash).js	67.88KB (-71B -0.1%)	+1%

Total files change -71B -0.1%

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history