### What was failing - `Typecheck` failed in `apps/web/app/home/autopilot-trigger-demo.tsx:303` with `TS18048: 'entry' is possibly 'undefined'`. - `Build web` compiled the application but failed during its TypeScript phase on the same error. ### Root cause The `IntersectionObserver` callback destructured the first array item and accessed `entry.isIntersecting` directly. With the repository's strict TypeScript settings, the first observer entry is typed as potentially absent. ### Fix - Updated `useOnScreen` in `apps/web/app/home/autopilot-trigger-demo.tsx` to use `entry?.isIntersecting ?? false`. This safely handles an empty observer-entry array while preserving behavior for normal callbacks. - Verified the targeted check with `npx --yes pnpm@9.15.9 --filter web typecheck`; it passes. - Re-ran the web build. Compilation and TypeScript now pass; local page-data collection proceeds until it reaches the unrelated environment requirement `DATABASE_URL is required` for `/api/campfire/refs`. - Ran `git diff --check`; no whitespace errors were found, and only the intended source file remains modified. Failing checks addressed: `Build web`, `Typecheck` Verification passed and changes were pushed as `26269010166a`. Changed files: ```text apps/web/app/home/autopilot-trigger-demo.tsx | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) ``` Diff preview: ```diff diff --git a/apps/web/app/home/autopilot-trigger-demo.tsx b/apps/web/app/home/autopilot-trigger-demo.tsx index 9c43ea7..da9092f 100644 --- a/apps/web/app/home/autopilot-trigger-demo.tsx +++ b/apps/web/app/home/autopilot-trigger-demo.tsx @@ -300,7 +300,7 @@ function useOnScreen(ref: RefObject<Element | null>) { if (!node) return const observer = new IntersectionObserver( - ([entry]) => setVisible(entry.isIntersecting), + ([entry]) => setVisible(entry?.isIntersecting ?? false), { threshold: 0.35 } ) observer.observe(node) ```