Mastering TypeSafe Jev

It is the companion source code for the book Mastering TypeSafe Jev, subtitled the complete engineering playbook for building AI decision engines with TypeSafe Jev and open-source Kev. The book site lives at mastering-jev-and-kev-book.vercel.app.

Part I builds an Autonomous Incident and FinTech Triage Engine on the hosted Jev API; Part II builds SmartPlant Decision Intelligence, an industrial-IoT capstone, on self-hosted Kev. Both run on one shared decision client.

Chapters 1–8 use hosted Jev and build the triage package in capstone-project/; chapters 9–13 use self-hosted Kev for the smartplant package in smartplant-capstone/, reusing triage. Two appendices explain the System One approach and summarise both capstones' use cases.

The triage engine returns is_fraud_suspected (Noul), urgency_rating 1–5 (Score), and dispatch_target (Choice) in one call; code owns eligibility, fraud override, confidence gates, and a circuit breaker. SmartPlant returns intervention_urgency and operational_action decisions with safety floors and a hash-chained audit in code.

At a glance: 13 chapters plus 2 appendices, 2 installable packages, 48 automated tests plus one live eval, and 12 runnable mini-projects; chapters 10–13 include 10-minute hands-on IoT walk-throughs.

No — this is the companion source code. The README presents it as the code repository for the book and links the book site; the chapter text lives on the book's own site, and the captured README was cut off partway through the chapter table.

The GitHub repository is udooz/mastering-jev-and-kev-book under the MIT license, created 2026-10-11 and last pushed 2026-10-14, with 0 stars at capture time. The README publishes no independent evaluation of the capstone decisions.