Event Nest

A collection of NestJS libraries for building event-sourced applications.

Documentation

Read the Event Nest documentation or start with Build Your First Aggregate.

Features

• Domain events and aggregate roots with event replay.
• Transactional event persistence through MongoDB, PostgreSQL, or Microsoft SQL Server.
• Optimistic concurrency through aggregate stream versions.
• Optional snapshots with composable synchronous or asynchronous policies.
• In-process NestJS domain subscriptions after persistence.
• Aggregate purging for explicit administrative deletion workflows.

Event Nest is a focused set of libraries, not a complete application framework, ORM, or distributed event bus.

Installation

Install core and one persistence adapter:

pnpm add @event-nest/core @event-nest/postgresql pg

Replace @event-nest/postgresql pg with @event-nest/mongodb mongodb or @event-nest/mssql tedious for another adapter. See the installation guide for module configuration.

Packages

Package	Purpose
@event-nest/core	Aggregate, event, repository, snapshot, and subscription primitives
@event-nest/mongodb