@jsvision/ui / untrack

Function: untrack()

untrack<T>(fn): T

Defined in: ui/src/reactive/scheduler.ts:342

Run fn without subscribing the current computation to anything it reads. Use it inside an effect or computed to read a signal's current value without making that signal a dependency, so a later change to it will not trigger a re-run. The tracking context is restored afterwards.

Type Parameters

T

T

Parameters

fn

() => T

The function to run untracked.

Returns

T

Whatever fn returns.

Example

import { signal, effect, untrack } from '@jsvision/ui';

const value = signal(0);
const label = signal('count');
effect(() => {
  // Re-runs when `value` changes, but NOT when `label` changes (read untracked).
  console.log(untrack(() => label()), '=', value());
});