Isaí Céspedes’ Post

Ever tired of waiting for TypeScript builds just to test a quick change? 🤔 Node.js now runs TypeScript natively, but there's a catch: not all TypeScript features are erasable. Starting with Node.js 22.18.0+, you can execute .ts files directly. However, features like enums, decorators, and private modifiers aren't erasable—they'll cause runtime errors. The solution? Use the `--erasableSyntaxOnly` flag to ensure your code stays runtime-safe. Why does this matter? → Faster development cycles → Direct debugging with preserved line numbers → No source map confusion → Reduced toolchain complexity Check out this comparison of erasable vs non-erasable syntax: What's your biggest pain point with TypeScript builds, and will native execution change your workflow? 💭 #TypeScript #NodeJS #JavaScript #WebDevelopment #DeveloperTools

I just learned something small in TypeScript today… but it completely changed how I think about handling user state in React Instead of guessing if a user exists or not, I used a proper type: • AuthUser | null That one line made everything safer and cleaner. • No more “undefined errors” flying around. • No more messy checks. • Just clear, predictable state. I built a simple login/logout flow where: • The user is either an object (logged in) • Or null (logged out) And with optional chaining (user?.name), my UI stays smooth without breaking. It may look basic… but this is how solid frontend systems are built one correct type at a time. TypeScript is slowly turning my “it works” code into “it’s reliable” code If you’re learning React + TypeScript, don’t skip this pattern. It’s a game changer. I’m currently deep in my TypeScript journey, sharing what I learn as I grow. Let’s connect 🤝 #typescript #reactjs #frontenddeveloper #webdevelopment #codingjourney #javascript #techinpublic #buildinpublic #devcommunity

🚀 Day 1 of 30 Days of TypeScript 🔥 Why TypeScript is dominating modern frontend & backend development If you're still writing large-scale apps in plain JavaScript… you're making life harder than it needs to be. TypeScript isn’t just a trend — it’s becoming the default for serious development. 💡 So why is everyone switching? 👉 1. Type Safety = Fewer Bugs Catch errors before they hit production. No more “undefined is not a function” surprises. 👉 2. Better Developer Experience Autocomplete, IntelliSense, and clear APIs make coding faster and more enjoyable. 👉 3. Scales with Your Project Whether it's a small app or a massive system, TypeScript keeps your code maintainable. 👉 4. First-Class Framework Support From Angular to Node.js backends, TypeScript is deeply integrated everywhere. 👉 5. Easier Team Collaboration Types act like documentation — your team instantly understands what’s going on. ⚡ Reality check: JavaScript gives you freedom. TypeScript gives you confidence. 👨💻 If you're building anything beyond a simple project, TypeScript is no longer optional — it's essential. 💬 Are you using TypeScript already, or still sticking with JavaScript? #TypeScript #JavaScript #WebDevelopment #Frontend #Backend #100DaysOfCode #Coding

JavaScript has a somewhat bad reputation, and it's honestly warranted. Being loosely typed, too flexible and easy to shoot yourself in the foot. TypeScript's safety benefits are well documented at this point: catching errors at compile time, better tooling, fewer runtime surprises. That's not the interesting part anymore, if we dig deeper on TypeScript systems, there's more to its' usage. To me, what's more compelling is how typing the components forces you to actually understand your data before you use it. You can't just pass something around and hope for the best. You have to know its shape, its constraints, what it represents in the context of the application. That's where it gets interesting for frontend developers specifically. When you're defining and consuming typed interfaces, you're not just writing safer code, you're reasoning about business rules. What does an Order look like? What states can a User be in? Those are product questions, not just technical ones.That proximity to the domain and to what the product actually does, is something frontend used to be distanced from. TypeScript quietly closes that gap. It makes you a better developer not just because it catches your mistakes, but because it demands that you understand what you're building before you build it. And in the end, turns out frontend can be less about centering divs and more about understanding what the product actually needs. #TypeScript #JavaScript #FrontendDevelopment #WebDevelopment #React #SoftwareEngineering

💻 5 React mistakes I stopped making (and it improved my code a lot) When I started with React, I used to write code that worked… But not code that was clean, scalable, and maintainable. Here are 5 mistakes I fixed: ❌ 1. Writing everything in one component 👉 Now I break UI into small reusable components ❌ 2. Ignoring proper state management 👉 Learned when to use useState vs useEffect vs lifting state ❌ 3. Not handling performance 👉 Started using memoization (useMemo, useCallback) ❌ 4. Poor folder structure 👉 Now I follow a clean project structure ❌ 5. Debugging randomly 👉 Now I debug step-by-step with proper logs Small changes… but huge difference in code quality 🚀 Still learning every day 👨💻 Which mistake did you make the most? 😅 #ReactJS #FrontendDevelopment #JavaScript #CleanCode #WebDevelopment #SoftwareEngineer

🚀 Day 970 of #1000DaysOfCode ✨ What is JSX, Why It’s Used & What is TSX If you’ve worked with React, you’ve definitely written JSX — but many developers don’t fully understand what it actually is under the hood. In today’s post, I’ve explained what JSX is, why it’s used, and how it makes writing UI more intuitive by combining JavaScript and HTML-like syntax. I’ve also covered TSX — which is basically JSX with TypeScript — helping you write type-safe components and catch errors early during development. Understanding this difference helps you choose the right approach based on your project needs and team setup. This is one of those concepts that looks simple but plays a big role in how modern React applications are built. If you’re working with React or planning to learn TypeScript, this clarity will really help. 👇 Do you prefer working with JSX or TSX in your projects? #Day970 #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #TypeScript #CodingCommunity

Framework fatigue is real. Every year, a new JavaScript framework promises faster development, cleaner code, and better performance. React, Vue, Svelte… and the list keeps growing. But here’s the uncomfortable question: Are we actually becoming more productive, or just better at relearning the same concepts in different syntaxes? On one hand, modern frameworks have undeniably improved developer experience: - Better state management - Component-based architecture - Rich ecosystems On the other hand: - Constant churn means skills have a shorter shelf life - Teams spend more time migrating than building - “Best practices” change faster than projects can stabilize The result? We risk optimizing for trends instead of outcomes. Most users don’t care what framework you used. They care if the product works, loads fast, and solves their problem. So maybe the real skill isn’t mastering the latest tool, it’s knowing when not to switch. Curious where others stand: Are new frameworks pushing the industry forward, or just creating noise?

. 🚀 Building a Real-Time Web IDE: React Sandbox with Docker I’ve been diving deep into system architecture lately, and I’m excited to share a project I’ve been building: a dynamic sandbox environment for React development. Think of it as a lightweight, browser-based VS Code. It allows users to spin up a React environment instantly, execute code, and interact with a live terminal—all within a secure, isolated container. 💡 Technical Deep Dive: Isolated Environments: Each user gets a dedicated Docker container. This ensures the host machine remains untouched and provides a true "sandbox" experience. Persistent Sessions: I recently optimized the backend to reuse existing containers for active sessions, significantly reducing overhead and improving terminal latency. Real-Time Sync: Using Socket.io for code synchronization and raw WebSockets for the terminal stream to ensure sub-millisecond feedback loops. The Frontend Experience: Integrated Monaco Editor for a premium coding feel and Xterm.js for a fully functional terminal UI. 🛠️ The Tech Stack: Backend: Node.js Terminal/Real-time: Xterm.js & WebSockets Editor: Monaco Editor Infrastructure: Docker (Containerization) & Socket.io . 🔗 GitHub Repo:https://lnkd.in/g6Xj5hVf 🔄 What’s Next? I’m currently working on a branch for dynamic port mapping to allow previewing multiple services, alongside some UI polish. I plan to push the stable version in the next 1–2 weeks. In the future, I’ll be extending support to Node.js, Next.js, and Go environments. I’d love to hear your thoughts on the architecture or any suggestions for features! #BuildInPublic #FullStack #SystemDesign #Docker #ReactJS #NodeJS #WebSockets #DevTools

🚀 Day 5/30 — Async/Await changed JavaScript forever Before async/await, we wrote: 𝘭𝘰𝘨𝘪𝘯𝘜𝘴𝘦𝘳() .𝘵𝘩𝘦𝘯(𝘨𝘦𝘵𝘖𝘳𝘥𝘦𝘳𝘴) .𝘵𝘩𝘦𝘯(𝘱𝘳𝘰𝘤𝘦𝘴𝘴𝘗𝘢𝘺𝘮𝘦𝘯𝘵) .𝘤𝘢𝘵𝘤𝘩(𝘩𝘢𝘯𝘥𝘭𝘦𝘌𝘳𝘳𝘰𝘳) Worked well… But async/await made asynchronous code feel natural: 𝘵𝘳𝘺 { 𝘤𝘰𝘯𝘴𝘵 𝘶𝘴𝘦𝘳 = 𝘢𝘸𝘢𝘪𝘵 𝘭𝘰𝘨𝘪𝘯𝘜𝘴𝘦𝘳(); 𝘤𝘰𝘯𝘴𝘵 𝘰𝘳𝘥𝘦𝘳𝘴 = 𝘢𝘸𝘢𝘪𝘵 𝘨𝘦𝘵𝘖𝘳𝘥𝘦𝘳𝘴(𝘶𝘴𝘦𝘳.𝘪𝘥); 𝘢𝘸𝘢𝘪𝘵 𝘱𝘳𝘰𝘤𝘦𝘴𝘴𝘗𝘢𝘺𝘮𝘦𝘯𝘵(𝘰𝘳𝘥𝘦𝘳𝘴); } 𝘤𝘢𝘵𝘤𝘩(𝘦𝘳𝘳){ 𝘤𝘰𝘯𝘴𝘰𝘭𝘦.𝘦𝘳𝘳𝘰𝘳(𝘦𝘳𝘳); } Cleaner. Easier to debug. Easier to maintain. 𝐁𝐮𝐭 𝐡𝐞𝐫𝐞’𝐬 𝐭𝐡𝐞 𝐦𝐢𝐬𝐭𝐚𝐤𝐞 𝐦𝐚𝐧𝐲 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫𝐬 𝐦𝐚𝐤𝐞👇 await getUsers(); await getOrders(); await getProducts(); ❌ Slow (runs sequentially) Better: await Promise.all([ getUsers(), getOrders(), getProducts() ]); ✅ Concurrent + faster 💡 Big lesson: Async/Await improved readability. Promise.all() improves performance. Small code decisions create big scalability differences. What do you prefer in production: Async/Await or .then() chains? #NodeJS #JavaScript #AsyncAwait #BackendDevelopment #SoftwareEngineering

🚀 Level Up Your TypeScript: 21 Best Practices You Need to Know TypeScript's type system is a game-changer for writing reliable, scalable code. But knowing the syntax is one thing—mastering best practices is another. I recently came across a solid guide covering 21 practical TypeScript tips. Here are the key takeaways every developer should know: ✅ Strict mode on – Catch bugs early with "strict": true ✅ Let TypeScript infer – Don't over-annotate; trust type inference where it makes sense ✅ Use interfaces for objects – Clear contracts = cleaner refactoring ✅ Prefer unknown over any – It forces type checks and prevents silent failures ✅ Leverage utility types – Pick, Partial, Readonly save time and reduce bugs ✅ Type guards & generics – Write flexible, reusable code without losing safety ✅ Mapped & conditional types – Advanced but powerful for complex scenarios ✅ Decorators – Add logic cleanly without messing with core code Whether you're just starting or already deep into TS, these practices will help you write cleaner, more maintainable code. 🎯 Your turn: Which TypeScript best practice has saved you the most headaches? #TypeScript #JavaScript #WebDevelopment #CodingBestPractices #SoftwareEngineering #CleanCode #FrontendDevelopment #ProgrammingTips #TechLearning #CodeQuality