track

Records that the running computation read source, so a later markObservers on it marks that computation stale.

Records that the running computation read source, so a later markObservers on it marks that computation stale. Call it in the reader of a custom source; readSignal does it for signals. Does nothing when untracked, and a source read again in the same run is recorded once.

Import#

import { track } from "@shadow-js/core/extend";

Signature#

function track(source: Source): void

Parameters#

Name	Description
`source`	The source that was read.

Examples#

import { markObservers, schedule, type SourceNode, track } from "@shadow-js/core/extend";

const clock: SourceNode = { kind: 0, value: Date.now(), observers: null, stamp: 0 };
export function now(): number {
  track(clock);
  return clock.value as number;
}
setInterval(() => {
  clock.value = Date.now();
  markObservers(clock);
  schedule();
}, 1000);