fn(args, deps) — Bringing Order to Chaos Without Breaking Anything

There’s a major disconnect in AI-assisted development right now. Most of the conversation assumes you’re building something new, or working from the kind of clean, stable foundation that barely exists in real engineering teams.

The reality is that most engineering teams live in legacy systems under high load, with god classes, global singletons, and console.log as observability. The kind of code where every change is a gamble.

This post shows what happens when you apply fn(args, deps) and autotel to those codebases. fn(args, deps) creates the seam for safe change; production telemetry captures the behavioural record that survives when every other spec has decayed.

To prove the point, we’ll do this in plain JavaScript, not TypeScript.

A Decade of Leadership: Celebrating Joe Parry's Legacy at the JavaScript & NodeJS Cambridge Meetup Group

This post celebrates and thanks Joe Parry as he takes a well-deserved bow and steps down from his role as the head of the JavaScript & NodeJS Cambridge Meetup Group.

He has been an extraordinary leader who has dedicated the past ten years to fostering a vibrant community of Javascriptors in Cambridge.