📰 Dev.to · HK Lee
Articles from Dev.to · HK Lee · 33 articles · Updated every 3 hours · View all reads
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Dev.to · HK Lee
2mo ago
Rust Is Eating the JavaScript Toolchain: Rolldown, Oxc, Rspack, and the End of JS-Based Build Tools
Your bundler, linter, transpiler, and minifier are all being rewritten in Rust. Here's what's happening, why it matters, and how to migrate before you're left b
Dev.to · HK Lee
2mo ago
React Compiler Deep Dive: How Automatic Memoization Eliminates 90% of Performance Optimization Work
Master the React Compiler in 2026. Learn how automatic memoization works under the hood, migration strategies from useMemo/useCallback, real-world performance b
Dev.to · HK Lee
2mo ago
TypeScript 5.5's Game-Changing Feature: Inferred Type Predicates Explained
TypeScript 5.5 introduces automatic type guard inference that eliminates thousands of lines of boilerplate. Learn how Inferred Type Predicates work, when they t
Dev.to · HK Lee
2mo ago
Why Your React App Re-renders Too Much: A Deep Dive into Performance Optimization
Your React app feels sluggish and you don't know why. Learn the exact patterns causing unnecessary re-renders, how to identify them with React DevTools, and bat
Dev.to · HK Lee
2mo ago
Why Your React App Feels Slow: Fixing Performance with Web Workers
Your React app freezes during heavy computations. Users rage-quit. The main thread is crying. Learn how to offload expensive operations to Web Workers and make
Dev.to · HK Lee
3mo ago
Vercel AI SDK Complete Guide: Building Production-Ready AI Chat Apps with Next.js
Master the Vercel AI SDK to build streaming AI chat applications with Next.js. Learn useChat, useCompletion, AI SDK Core, multi-provider integration, and produc
Dev.to · HK Lee
3mo ago
Tailwind CSS v4 Migration Guide: Everything That Changed and How to Upgrade (2026)
Tailwind v4 rewrote everything—new engine, CSS-first config, no PostCSS plugin. Here's the complete migration guide with before/after code and gotchas we learne
Dev.to · HK Lee
3mo ago
PostgreSQL vs MySQL vs MongoDB in 2026: The Honest Comparison Nobody Asked For
Tired of biased database comparisons? We break down when to actually use PostgreSQL, MySQL, or MongoDB based on real-world use cases, performance data, and deve
Dev.to · HK Lee
3mo ago
Model Context Protocol (MCP): The Complete Guide to Building AI Agents That Actually Work
Learn how MCP is revolutionizing AI agent development. From architecture deep-dive to production implementation, this guide covers everything you need to build
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