Can virtua cause memory leak on frequent scroll

[morajabi]

In our chat app we're hunting for a memory leak. I noticed this memory uptick on frequently scrolling (around 100 MB) which doesn't go down. I'm still not 100% sure this is virtua, but wanted to open this discussion to understand better if it can be indeed caused by virtua.

CleanShot.2023-11-26.at.18.22.11-converted.mp4

Higher quality:
CleanShot 2023-11-26 at 18.22.11.mp4.zip

[inokawa]

I hope it is not caused by virtua. In theory it will not cause memory leak but there are several things that might help:

• If props.children is ReactNode, it is flattened to array and keeped with useMemo.
• Items' sizes and offsets are cached in number array. The length will match total length of items.
• Item's actual DOM is keeped in WeakMap to associate DOM and item's index until unmount.
• Items are observed with ResizeObserver on mount and unobserved on unmount.