AccordComposable domain modeling

Simplifying DDD for the rest of us. Business rules, events, and reactions through a small, explicit TypeScript API.

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Small, explicit API

Aggregates, events, rejections, views, and policies. Plain functions and classes you can read in one sitting.

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Every operation returns [value, null] or [null, error]. Business failures are plain tagged values you can match exhaustively.

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An in-process runtime with a memory store by default, and optional SQLite persistence that recovers after restart.

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Zero runtime dependencies for the core. Add Effect only if you want layers and lazy Effects.