setting signal outside of angular zone error

[robertIsaac]

Which @angular/* package(s) are the source of the bug?

zone.js

Is this a regression?

No

Description

when updating signal outside of Angular zone, it doesn't reflect in the Angular app which produce very hard to debug bugs

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/stackblitz-starters-amkub7?file=src%2Fmain.ts

Please provide the exception or error you saw

it shows `Hello from Angular!` instead of `Hello from Rob!`

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 17.3.6
Node: 20.11.0
Package Manager: npm 10.4.0
OS: win32 x64

Angular: 17.3.6
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router, ssr

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1703.6
@angular-devkit/build-angular   17.3.6
@angular-devkit/core            17.3.6
@angular-devkit/schematics      17.3.6
@schematics/angular             17.3.6
rxjs                            7.8.1
typescript                      5.4.5
zone.js                         0.14.4

Anything else?

workaround is to run effect that does nothing but read the signal fixes the problem

effect(() => {
  this.name();
});

this error happen in both default and push detect changes strategy

[JeanMeche]

This is a known issue and being adressed in v18 with the new hybrid change detection scheduling. The new feature is opt-out, meaning by default every v18 apps will trigger CD on signal update even when happening outside the zone.

The opt-out to return to pre-v18 behavior will be accessible via provideZoneChangeDetection({ ignoreChangesOutsideZone: true }).

You can already try this is the latest pre-release.

[robertIsaac]

This is a known issue and being adressed in v18 with the new hybrid change detection scheduling. The new feature is opt-out, meaning by default every v18 apps will trigger CD on signal update even when happening outside the zone.

The opt-out to return to pre-v18 behavior will be accessible via provideZoneChangeDetection({ ignoreChangesOutsideZone: true }).

You can already try this is the latest pre-release.

sorry to bother you then, I tried to search first but couldn't see a reported issue about it

[JeanMeche]

The umbrella issue is #53844, feel free to have a look at it 🙂