// 11 articles on JavaScript by Faez Tgh — practical React, Next.js, TypeScript and web-performance write-ups.
A click that lands on an already-rendered page feels like magic. The Speculation Rules API is the standardized, low-effort way to get there — the browser prefetches or fully prerenders likely next pages so navigation is near-instant. Here's the mental model and the guardrails.
Most 'impossible states' bugs come from types that are too loose — an object with optional fields that shouldn't coexist. Discriminated unions make the illegal combinations unrepresentable, and give you exhaustive checking for free.
There's a tension in TypeScript between 'check that this matches a type' and 'keep the precise type of what I wrote.' A plain annotation forces you to choose the first and lose the second. The satisfies operator, added in 4.9, gives you both.
Scroll, resize, input, mousemove — some events fire dozens of times a second. Debounce and throttle are the two techniques for turning that firehose into something your handlers can survive. They're often confused; they solve different problems.
Google's Core Web Vitals are three numbers that quietly shape your search ranking and your users' patience. INP replaced FID in 2024 — here's what each metric measures, the thresholds that matter, and the fixes that actually help.
Performance doesn't happen by accident. Here are the tools every Next.js developer should know — from automated audits and bundle visualization to image compression and Core Web Vitals tracking.
Decorators are one of TypeScript's most powerful features. Understand what they are, how they attach to classes and members, and how to write your own from scratch.
TypeScript namespaces bundle related code into logical containers and prevent naming collisions — but with ES6 modules now mainstream, should you still reach for them?
Function overloading and generics bring flexibility, reusability, and safety to TypeScript. Learn how each works and when to reach for them.
Derive types directly from your JavaScript modules using typeof import and indexed access types — fine-grained, module-driven type control in TypeScript.
Write more dynamic and robust TypeScript by mastering six advanced concepts: generics, union and intersection types, type guards, nullish coalescing, and discriminated unions.