isComputingMemo

Says whether a memo (not an effect) is computing right now: writing signals is a mistake there. Cleanups that run while a memo tears down rows or children may write, so a disposal in progress is not a violation, and neither is a memo created with allowWrites. Use it to guard a custom write path the way writeSignal does.

Import#

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

Signature#

function isComputingMemo(): boolean

Returns#

true while a memo without allowWrites computes and no disposal is running.

Examples#

import { isComputingMemo, ShadowError } from "@shadow-js/core/extend";

function appendLog(log: string[], entry: string): void {
  if (isComputingMemo()) throw new ShadowError("WRITE_IN_MEMO");
  log.push(entry);
}