Juanchi.dev
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Juanchi.dev
Digital Native · real systems
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TypeScript in production

The blog's deepest topic: 91 posts on strict types, compiler limits, ecosystem tooling, and decisions you pay for in production.

  • Strict types and their limits

    What the compiler guarantees, what it does not, and where type safety ends.

  • Package managers and monorepos

    pnpm, npm, yarn, and bun compared on real repos, not marketing benchmarks.

  • Browser APIs that fail

    Cases where the type signature says one thing and the runtime does another.

Recommended reads

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Aug 17 2026

Server Actions Solves Your Mutation, Not Your Cache

Server Actions in Next.js 16 App Router makes mutations dead simple without writing an endpoint. But when you need client-side cache, optimistic revalidation, or reactive data shared across components, that's where Server Actions falls short — and TanStack Query steps in to solve that, not to replace it.

Aug 17 2026 · 8′ · Tutorials · TypeScript · app-router

8′
Aug 17 2026

Cline in production: the autonomous code agent for VS Code I use with deliberate constraints

Cline can create files, run commands, and open the browser autonomously from inside VS Code. That sounds like productivity. It also smells like risk if you haven't thought through the permissions before you start. My thesis: the mental model matters more than the tool.

Aug 17 2026 · 9′ · Tutorials · TypeScript · LLM

9′
Aug 14 2026

A native discriminated union already does what Either promises

I wrote about fp-ts this week and was left with an uncomfortable doubt: did I really need all that machinery? A look at when a native discriminated union solves the same problem as Either/Option without the learning curve.

Aug 14 2026 · 7′ · Tutorials · TypeScript · arquitectura de software

7′
Aug 14 2026

tsconfig paths in Next.js 16 App Router: when they help and when they silently break the build

Path aliases look innocent until the production build fails with no clear message. I documented the 3 most common breakage cases in a monorepo with Next.js 16 App Router and strict TypeScript, and the config pattern that survived.

Aug 14 2026 · 9′ · Tutorials · TypeScript · pnpm

9′
Aug 07 2026

Functional programming with TypeScript: what fp-ts teaches you even if you never ship it

fp-ts is a university, not a production framework for most teams. But ignoring it completely means leaving genuinely valuable concepts on the table. An honest walkthrough of Option, Either, and pipe from the perspective of strict TypeScript in the real world — plus the uncomfortable question of whether you actually need it.

Aug 07 2026 · 10′ · Tutorials · Next.js · TypeScript

10′
Aug 04 2026

The Complete Guide to Docker HEALTHCHECK: Dockerfile vs Compose vs Orchestrator

Why a HEALTHCHECK copied from a tutorial usually lies more than having none at all, and how to decide between Dockerfile, Compose, and the orchestrator based on what you actually need to monitor.

Aug 04 2026 · 9′ · Tutorials · docker · devops

9′

Juanchi.dev is Juan Torchia’s public notebook — architecture, real systems and product decisions. Written and reviewed by hand in Buenos Aires. Built with Next.js, Prisma and PostgreSQL; deployed on Railway. No third-party trackers beyond aggregate analytics.

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