Shared Domain Library Contract

Purpose

Use this skill to audit or design Angular shared domain libraries in Nx monorepos.

A shared domain library must behave as a reusable source of business concepts, not as a dumping ground for UI helpers, transport adapters, or feature orchestration. It should expose entities, value objects, policies, rules, and domain-level invariants that can be shared across multiple features or data-access layers without leaking infrastructure or presentation concerns.

The core rule is simple:

Domain libraries define concepts and rules.
Data-access libraries implement transport and persistence.
Feature libraries orchestrate workflows.
UI libraries render and emit intent.

When to Use