DevIdiot!
Generic Constraints and infer: Reading the Types You Did Not Write
Book: The TypeScript Type System — From Generics to DSL-Level TypesAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou hover over a function and the tooltip readsPromise<{ id: string; name: string }>. You want the{ id: string; name: string } part on its own, as a namedtype, without typing it out by hand. The shape lives insideanother type. You did no
TypeScript Narrowing: 5 Control-Flow Tricks That Delete Your Type Casts
Book: TypeScript Essentials — From Working Developer to Confident TSAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou parse a webhook payload. The variable comes back asunknown, the compiler refuses to let you read .event off it,and the deadline is in twenty minutes. So you write(payload as WebhookEvent).event and move on.That cast is a promise you made
Shipping Dual ESM/CJS in 2026: The Library Author Checklist
Book: TypeScript in Production — Tooling, Build, and Library AuthoringAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou publish a small utility package. It compiles. The READMEexample runs on your laptop. You npm publish and move on.A week later an issue lands. A user on a CommonJS projectimports your package, and their bundler pulls in the ESM copyof yo
The 6 tsconfig Flags That Decide Whether Strict Mode Actually Helps
Book: TypeScript in Production — Tooling, Build, and Library AuthoringAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou turned on strict. The PR was clean. Your team felt goodabout it. Then a request comes in, body.items[0] is read on anempty array, and undefined flows three functions deep beforeit throws Cannot read properties of undefined. The stack tr
Template Literal Types: Type-Safe Routes Without a Codegen Step
Book: The TypeScript Type System — From Generics to DSL-Level TypesAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou register a route as /users/:id/posts/:postId. Somewhereelse in the handler you reach for req.params.postID. Wrongcase. The value is undefined at runtime. Nothing flagged it.The string in the route and the keys in the params object aretwo u
Branded Types: Stop Passing the Wrong String to the Right Function
Book: The TypeScript Type System — From Generics to DSL-Level TypesAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou have a function that cancels an order. It takes an orderID and a user ID, both strings, in that order.function cancelOrder( orderId: string, userId: string,): void { // ...}Six months later somebody calls it with the argumentsswapped. T
Discriminated Unions + never: Exhaustive Checks at Compile Time
Book: The TypeScript Type System — From Generics to DSL-Level TypesAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou add a new payment method. PixPayment joins CardPaymentand BankTransfer in the type, the API starts sending it, andthe order page renders it fine. Two weeks later finance askswhy Pix orders show a blank fee line on the invoice PDF. Thefee c
satisfies vs Type Annotation: The TypeScript Choice That Changes Inference
Book: The TypeScript Type System — From Generics to DSL-Level TypesAlso by me: The TypeScript Library — the 5-book collectionMy project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding toolsMe: xgabriel.com | GitHubYou have a config object. You want the compiler to check itagainst a known shape, so you reach for a type annotation:type RouteConfig = Record<string, string>;const routes: RouteConfig = { home: "/", users: "/users", billing: "/billin
Java Course: Learn Java Programming and Start Your Career in Software Development
Want to know why Java matters in today’s tech world? This course dives into the must-know Java concepts, walks you through practical topics, and shows you where a Java programming background can take your career.Java Course: Your Guide to Learning Java ProgrammingLet's be honest—if you aim to create contemporary software, websites, or apps, programming is more than just useful. It’s necessary. Out of all the programming languages out there, Java stands out. It’s popular, reliable, and found thro
🚀 Build a Production-Ready E-Commerce Application with React & Modern Frontend Technologies
Want to learn how modern e-commerce applications are built in real-world companies?In this comprehensive project-based series, we'll build a complete online store from scratch using React and industry-standard tools used by professional frontend developers.Here is a link to a playlist freely uploaded in Youtube:Youtube playlist🎯 What You'll Build✅ Advanced Product Listing Page✅ Search, Filtering, Sorting & Pagination✅ Product Details & Related Products✅ Shopping Cart with Persistent Stat
How Our AI Agents Built a Global Project Scope & Deliverable Generator in Record Time
Building the Future of Project Definition with AIIn the fast-paced world of freelancing and agency work, clearly defining project scope and deliverables is paramount. It's often a bottleneck, prone to miscommunication, and time-consuming. At Pixel Office, we tasked our specialized AI agents, Jan (our expert coder) and Klára (our intuitive designer), with a mission: to create a "Global Project Scope & Deliverable Generator" that would simplify this process, making it fast, private, and
Show HN: Paca – Lightweight Jira alternative for human-AI collaboration
<a href="https://news.ycombinator.com/item?id=48515385">Comments</a>
A low-carbon computing platform from your retired phones
<a href="https://news.ycombinator.com/item?id=48515336">Comments</a>
From Label Design to Bulk Print: A Complete React Integration Guide (Part 2)
Part 1 covered the what and why. This post is the full how — the complete workflow from designing a label template to bulk-printing hundreds of records, with real code from the React demo. The WorkflowLabels Tab → Design a template, save it with a title + entity typeMaster Table → Select that layout from a dropdownTable Rows → Check the records you want to printExport → PNG · PDF · ZPLThe key idea: the template and the data are separate. One layout can generate labels for hund
Introducing Arvia: a design system compiler for the web
Introducing ArviaArvia is a design system compiler. You describe your tokens, themes, and components in .arv files, and a compiler turns each one into three things before your app ever loads:plain CSS — the kind you'd write by hand,a typed styling API — call a function, get your class names, with autocomplete on every variant,TypeScript types — so a bad variant is a red squiggle, not a bug in production.The whole thing rests on one idea: styles are compiled, not computed. Because the compi
Why React? – Advantages and Disadvantages of React
IntroductionReact is one of the most popular JavaScript libraries for building user interfaces, especially Single Page Applications (SPAs). It was developed by Meta Platforms (formerly Facebook) and is widely used by companies such as Netflix, Instagram, and Airbnb.React helps developers create fast, interactive, and reusable UI components.Why React?Before React, developers often manipulated the DOM directly using JavaScript or jQuery, which became difficult to manage as applications grew.React
useState vs useReducer in React
What is useState?useState is a React Hook that allows functional components to create and manage state. Before Hooks were introduced, state could only be managed inside class components. With useState, developers can store values such as numbers, strings, booleans, arrays, and objects directly inside functional components and update them whenever needed.Whenever the state changes, React automatically re-renders the component and updates the UI with the latest data.Syntaxconst [state, setState] =
Most React boilerplates assume you're building a landing page
ShipFast, T3, Supastarter — great tools. For a basic SaaS MVP.When you need 30+ screens, complex filters, data tables, multi-step forms — you rebuild everything from scratch. Every project.You keep rebuilding the same damn foundation. A week of setup that still breaks the moment someone else joins.I'm packaging the patterns that actually fixed this into a boilerplate. Built specifically for data-heavy dashboards.$79 when it ships.Be honest: would you pay for that — or just read a blog post about
Calligraph: Motion-Based Text Transitions for React Apps
Calligraph: a React component for character-level text transitions powered by Motion.Key features:Shared characters slide into new positions.New characters fade in.Removed characters fade out.Custom spring settings tune the transition.Good fit for labels, headings, prices, and status text.👉 Blog Post👉 GitHub Repo👉 Live Demo
Leaving Mozilla
<a href="https://news.ycombinator.com/item?id=48513806">Comments</a>
