Specification Pattern

To encapsulate business rules as reusable predicates in TypeScript, create atomic specification objects implementing a generic interface with `isSatisfiedBy`, then compose them using `.and()`, `.or()`, and `.not()` operators to eliminate scattered conditional logic.

The specification pattern in domain-driven design is a technique that encapsulates business rules as composable, reusable objects. It allows you to apply consistent logic across domain-driven filtering, entity validation, and query predicate construction instead of writing nested if statements.

Yes, you can translate composable filters into Prisma where clauses. The Skill provides optional query translation guidance, allowing the same specification concepts used for in-memory filtering to be extended to drive Prisma-style database queries efficiently.

You validate domain entities without scattered conditional logic by applying composable specification objects via the `isSatisfiedBy` method. This enforces domain invariants deterministically by checking small atomic business rules combined with AND, OR, and NOT operators.

Yes, TypeScript strict mode works seamlessly with immutable specification objects. The Skill uses a TypeScript-first implementation with generics, immutable constructor parameters, and strict-mode friendly design to keep composable business rules safe and maintainable.

You should avoid using composable specifications for simple, one-off filtering tasks where introducing a generic Specification interface would add unnecessary abstraction overhead, making the code harder to read than straightforward inline conditional logic.