untrack

Runs fn outside of any reactive tracking — reads inside fn will not subscribe the current scope. Returns whatever fn returns.

Use untrack inside a memo or effect when you need to read a signal once without making the surrounding computation depend on its future changes.

Pass a strictReadLabel string to enable a dev-mode warning: any reactive read inside fn that isn't inside a nested tracking scope will log a warning naming the label.

Import

import { untrack } from "solid-js";

Type signature

function untrack<T>(fn: () => T, strictReadLabel?: string | false): T;

Examples

createEffect(
  () => trigger(), // tracks `trigger` only
  () => {
    const snapshot = untrack(() => state); // read once, untracked
    log(snapshot);
  }
);