5 posts tagged with "React"

Encountered this issue while building an AI Agent SaaS platform for a client. Here's the root cause and solution.

TL;DR​

E2E tests shouldn't depend on real OAuth login flows. By detecting localStorage test markers in the useAuth hook, you can inject mock auth state directly and skip Supabase initialization. Also change the Zustand store's loading default to false to prevent AuthGuard from showing an infinite spinner.

Encountered this issue while building an AI Agent chat interface. Here's the root cause and solution.

TL;DR​

Date.now() millisecond timestamps can duplicate within the same millisecond. When used as React list keys, this causes DOM errors. Fix by adding a random suffix or using crypto.randomUUID().

Encountered this issue while building an AI Agent platform. Here's the root cause and solution.

TL;DR​

Add lastFetchTime field and TTL constant to Zustand store. Check cache expiration before requesting. Implement effective data caching in ~10 lines of code, avoiding duplicate requests across pages.

TL;DR​

Key points for GA4 in React SPA: 1) Set send_page_view: false to prevent duplicate counts; 2) Use useLocation to track route changes and send pageviews manually; 3) Set user_id after login for cross-device tracking.

TL;DR​

The key to cascade selection: when parent changes, reset child to a valid value. Use Record<string, Option[]> for type-safe data mapping, and update child state inside onValueChange callback.