Insights, tutorials, and thoughts on building scalable applications and premium user experiences.
25 Vitest interview questions with real answers and code examples. Covers setup, globals, watch mode, mocking (vi.fn, vi.mock, vi.spyOn), snapshots, coverage, browser mode, and migrating from Jest. Updated for 2026.
How to set up Vitest with Next.js 16 App Router in 2026. Fixes ESM/CommonJS errors, configures happy-dom, mocks Next.js router and Supabase, and gets you to 100% reliable tests. Includes copy-paste config.
Complete guide to building a production-grade analytics dashboard with Next.js 16, Google Analytics, GitHub API, and Supabase. Includes full code examples, troubleshooting, and deployment strategies.
Step-by-step Vite to Next.js 16 App Router migration guide with real metrics: 54% JS bundle reduction, 0.8s TTFB, Lighthouse 78→96. Covers route restructuring, Server Components, async params gotchas, and image handling.
How I fixed LCP to under 1.2s, removed 14KB of render-blocking JS, pushed CLS to 0, and hit 100/100/100/100 on Lighthouse. Real code, before/after numbers, and every gotcha you will hit.
How AI, Server Components, and a return to simplicity are reshaping the way we build for the web.
A comprehensive guide to understanding JavaScript quirks - from type coercion to closures. Learn why [] + {} behaves the way it does and master the language peculiarities.