[feritcemkahraman]

Changing AutoSizer's box prop after mounting leaves measurements using the original box model. Switching from border-box to content-box should immediately remove padding and borders from the reported size, even without another resize event.

Keep box in the existing stable values ref and remeasure in a layout effect when it changes. Both observer and fallback subscriptions remain stable. Read computed styles from the measured element's own window.

Validation: the immediate fallback regressions and stable-observer regression failed on the previous revision; all 7 unit tests, full TypeScript, ESLint, formatting, and the library CJS/ESM/declaration build pass. Docs/examples were generated earlier with a temporary, restored Windows tooling adapter; the review changes leave the public API and generated content unchanged. Browser integration and cross-document browser tests were not run.

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[bvaughn]

This seems like a problem worth fixing, so thanks for pointing it out 👍🏼

I think the fix might be too narrowly focused, because it doesn't handle the fallback case:

react-virtualized-auto-sizer/lib/hooks/useSize.ts

Lines 142 to 151 in 328ddd0

	} else {
	// Defer requiring resize handler in order to support server-side rendering.
	// See github.com/bvaughn/react-virtualized-auto-sizer/issues/41
	const detectElementResize = createDetectElementResize(nonce);
	detectElementResize.addResizeListener(parentNode, onResizeStable);
	return () => {
	detectElementResize.removeResizeListener(parentNode, onResizeStable);
	};
	}

Admittedly this case is probably only very rarely used but even so it seems like it would be nice to fix both 😄

We could do that by adding box to the stableValuesRef, updating the callback ref to read box from that ref instead, and then re-evaluating the callback if the prop changes:

useLayoutEffect(() => {
  stableValuesRef.current.box = box;
  onResizeStableRef.current();
}, [box]);

If you're down for making that change– awesome. If not, I'm happy to chip in.

🔔 @bvaughn

[bvaughn]

While we're in here we could fix this too:

Suggested change

	cons getComputedStyle = parentNode.ownerDocument.defaultView.getComputedStyle;
	const style = getComputedStyle(parentNode) || {};

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Project	Deployment	Actions	Updated
react-virtualized-auto-sizer	Ready	Preview	Oct 16, 2026 8:53pm UTC

[bvaughn]

Published in 2.0.4: https://github.com/bvaughn/react-virtualized-auto-sizer/releases/tag/2.0.4

Thanks again!