Effectful View Model Architecture Guide

Effect Source Reference

The Effect v4 source is vendored in consuming projects at repos/effect/. Browse and read files there directly to look up APIs, types, and implementations.

Reference this for:

• Atom reactivity: packages/effect/src/unstable/reactivity/
• Context source: packages/effect/src/Context.ts
• Layer source: packages/effect/src/Layer.ts
• Effect source: packages/effect/src/

The Golden Rule: Zero UI Logic

VMs take domain input → VMs produce UI-ready output → Components are pure renderers

VM transforms domain to UI-ready: