`linkedSignal()`

A writable signal whose value is derived but can also be overridden locally.

Since Angular 19+ Spec ↗

Syntax

linkedSignal<T>(computation) | linkedSignal({ source, computation })

Parameters

Name	Type	Required	Description
`computation`	`function`	No	Derives the value from source signals.
`source`	`function`	No	Optional source whose change resets the linked value.

Returns

WritableSignal<T> — A writable signal that recomputes when its source changes.

Examples

import { signal, linkedSignal } from '@angular/core';

const options = signal(['a', 'b', 'c']);
const selected = linkedSignal(() => options()[0]);

selected.set('b');          // local override
options.set(['x', 'y']);    // resets to 'x'

Notes

linkedSignal behaves like computed (it derives from sources) but is writable, so the user can override the derived value. When the source changes the value recomputes, discarding the override. Ideal for selections that should reset when the underlying list changes.