ERROR RuntimeError: NG0600: Writing to signals is not allowed in a `computed`.

[KibetMasiror]

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

core

Is this a regression?

Yes

Description

ERROR RuntimeError: NG0600: Writing to signals is not allowed in a computed.

dialog = signal(false)

openDialog(action: ') {
    this.dialog.update(action => action = !action)
  }

Please provide a link to a minimal reproduction of the bug

Updating a writableSignal using update() throws the error: NG0600: Writing to signals is not allowed in a computed.

Please provide the exception or error you saw

quadrants.component.ts:42 ERROR RuntimeError: NG0600: Writing to signals is not allowed in a `computed`.

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

Angular CLI: 19.1.4
Node: 20.13.0
Package Manager: npm 10.5.2
OS: win32 x64

Angular: 19.1.3
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1901.4
@angular-devkit/build-angular   19.1.4
@angular-devkit/core            19.1.4
@angular-devkit/schematics      19.1.4
@angular/cli                    19.1.4
@schematics/angular             19.1.4
rxjs                            7.8.1
typescript                      5.6.3

Anything else?

No response

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