Vibe Coding Kills, Opus Dials, and Git Goes Cinema
Source: Dev.to
Anthropic just dropped Claude Opus 4.5 with an “effort” dial—finally, a model that lets you control your reasoning budget instead of the other way around! Meanwhile, a vibe‑coded SaaS killed a team (the cautionary tale we all needed but hoped to avoid), and Elio Capella Sánchez migrated 6,000 React tests in one week using AI agents and ASTs—proof that AI actually shines when wrangling legacy code.
Also in this issue: Matt Perry ranks animation performance like a fighting‑game tier list, Josh Comeau makes CSS Subgrid finally click, Lazar Nikolov shows how the Speculation Rules API can push e‑commerce loads under 100 ms, PostgreSQL 19 learns to aggregate first and join later, Matteo Collina squeezes 93 % more performance out of Next.js on Kubernetes, and Burak Yigit Kaya teaches us to publish packages with valet keys for better supply‑chain security.
On the tools front: Rete.js brings visual programming to React, Vue, Angular, and Svelte; gitlogue turns your Git history into terminal cinema; Athas offers a lightweight Cursor alternative with Vim mode and agentic AI; and SyncKit makes local‑first apps simple with CRDTs and zero‑config offline support.
Migrating 6000 React tests using AI Agents and ASTs
by Elio Capella Sánchez
The internet is flooded with impressive vibe‑style coding demos, but in day‑to‑day work at Filestage we rarely start codebases from scratch. This guide shows how AI agents and abstract syntax trees were used to migrate 6,000 React tests in a single week.
Introducing Claude Opus 4.5
by Anthropic
Claude Opus 4.5 is now available, featuring an “effort” dial that lets developers set a reasoning budget for the model, giving more predictable performance and cost control.
The Web Animation Performance Tier List
by Matt Perry
Animation performance is ranked like a fighting‑game tier list, revealing which CSS properties and techniques deliver the smoothest experience (spoiler: width is F‑tier).
Brand New Layouts with CSS Subgrid
by Josh W. Comeau
CSS Subgrid finally allows nested grids to participate in a parent grid layout, unlocking powerful new layout possibilities.
<100 ms E‑commerce
by Lazar Nikolov
Using the Speculation Rules API, e‑commerce sites can achieve sub‑100 ms load times, dramatically improving user experience.
A Vibe‑Coded SaaS Killed My Team
by cendyne.dev
A cautionary tale about a SaaS built with “vibe coding” that led to a team’s downfall, highlighting the risks of overly experimental development practices.
Releasing Packages with a Valet Key
by Burak Yigit Kaya
A guide to publishing npm, PyPI, and other packages using “valet keys” to improve supply‑chain security.
Super fast aggregations in PostgreSQL 19
by Hans‑Jürgen Schönig
PostgreSQL 19 introduces early aggregation before joins, enabling dramatically faster query performance.
93 % Faster Next.js in (your) Kubernetes
by Matteo Collina
Techniques and benchmarks showing how to achieve a 93 % performance boost for Next.js applications running on Kubernetes.
Rete.js
by retejs.org
A JavaScript framework for visual programming that works with React, Vue, Angular, and Svelte.
gitlogue
by Yuji Ueki
A cinematic Git commit replay tool for the terminal, turning your Git history into a living, animated story.
Athas
by athas.dev
A lightweight code editor featuring Vim mode, Git integration, and agentic AI editing capabilities.
SyncKit
by Daniel Bitengo
A powerful, type‑safe sync engine for building real‑time collaborative applications. It’s local‑first, CRDT‑based, and offers zero‑config offline support.