TypeScript 7.0 and 7.1 deep dive: parallelism, new defaults, and migration
A technical deep dive into TypeScript 7.0 and 7.1: how --checkers and --builders work, why the defaults changed, what was removed, migration examples, and FAQ.
Diego Betto · Technical consulting for companies
Solid web architecture for companies that can't afford downtime or technical debt
I'm Diego Betto, Co-Founder & CTO of PAPION. My team and I help companies, agencies, and product teams design, build, and secure scalable React, Node.js, and TypeScript applications.
Services
End-to-end technical consulting, from frontend to security, for companies that need to scale without surprises.
Frontend Architecture
Design and scalability for React, Next.js, and Astro applications: maintainable components, solid performance, less technical debt over time.
Backend & APIs
Development and optimization of Node.js, Fastify, and TypeScript APIs: reliable services built to handle business growth.
Code Review & Mentoring
Hands-on support for dev teams to raise TS/JS code quality, cut production bugs, and speed up onboarding.
Security & Performance
Application hardening, dependency/CVE monitoring, Core Web Vitals optimization.
About me
My name is Diego Betto. I am Co-Founder & CTO, senior full-stack engineer at PAPION, with 20+ years of experience. I'm based in Udine, Italy, working mostly remotely for clients across the country. I work across frontend and backend architecture, application security, and mentoring other developers, with particular depth in React, JavaScript/TypeScript, and Node.js.
Learn more →Where we work
Detailed case studies coming soon — in the meantime, here are the contexts we work in most often with PAPION.
E-commerce & Retail
High-traffic React frontends and order-management system integrations.
B2B SaaS Products
Node.js/Fastify backends for growing products, with a focus on security and observability.
In-house Tech Teams
Code review, mentoring, and security hardening without slowing delivery down.
From the blog
Technical notes on React, Node.js, security, and performance.
Vitest: what it is, how to install it, and how to use it with React 19
A practical guide to Vitest: installation, configuration, testing React 19 components (including useActionState), mocking with vi, coverage, and a comparison with Jest and node:test.
GEO vs SEO: differences, overlap and a pre-launch checklist
GEO (Generative Engine Optimization) is not a replacement for SEO: it builds on it. What changes, where the two overlap, and a checklist to run before going live.
WordPress security checklist: what to check before and after going live
A practical WordPress security checklist: what to lock down before you publish (updates, login, permissions, headers, backups) and what to monitor after launch.
Why 0.1 + 0.2 !== 0.3 in JavaScript (and in almost every language)
How IEEE 754 floating-point numbers actually work, why this isn't a JavaScript-specific bug, and the safe ways to compare and store decimal numbers.
JavaScript's new Set methods: union, intersection, difference, and the rest
The native Set operations that shipped in modern engines — union, intersection, difference, symmetricDifference, isSubsetOf, isSupersetOf, isDisjointFrom — with before/after examples.
The most common forEach mistakes in TypeScript
forEach looks like the simplest array method there is, but in TypeScript it hides real traps: async callbacks TypeScript won't flag, narrowing lost inside closures, implicit-any indexing.
Let's talk about your project
Tell me about your technical challenge: architecture, performance, security, or a team that needs reinforcing. I answer every email personally.