Troubleshooting

For renders fallback even though I expected rows

Check whether each is null, undefined, or an empty array. For is the API for list emptiness; Show array truthiness is not a length check.

My Show branch does not render for 0

0 is falsy. Pass a boolean condition and render the numeric value separately.

<Show when={count !== null}>{count}</Show>

Show.Link is undefined

Register the component first with PluginManager.register, and add UtilinentRegister module augmentation for TypeScript.

Lazy loading never starts

Make sure the observed element has size. Observer applies minimal size defaults, but your CSS can still make the element impossible to intersect.

Next.js complains about hooks or browser APIs

Move Mount, Observer, Slacker, or useIntersectionObserver usage into a Client Component with 'use client'.