Ontologic

A TypeScript toolkit for building software that speaks your domain's language. Model your business rules, protect your invariants, and make failures explicit.

Documentation

Full documentation, guides, and examples are available at:

ontologic.site

Quick start

npm install ontologic

What's inside

• Domain Entity — Entities that own their state and enforce their own rules
• Invariants — Business rules checked on every state read, not just after specific operations
• Domain Events — Immutable, versioned facts about what happened in your domain
• Result Pattern — Typed domain failures as return values, not hidden exceptions
• Repository — Persistence interface that saves entity state and events atomically
• Event Bus — Types event bus that allows to publish and listen to your domain events
• Message Relay — Built-in Outbox Pattern with in-memory component for fast prototyping
• Workflows — Typed, resumable pipelines for multi-step business processes

Examples

Library Management App

A full-featured library management application built with NestJS, demonstrating all Ontologic features on a real-world use case:

sachacr/library-examples

Smaller examples

Focused examples (entity, invariants, events, use cases) are in the examples/ directory — a credit balance aggregate and an order lifecycle.

License

MIT