langium-zodZod schemas from Langium grammars

Derive Zod v4 validation schemas from Langium grammar definitions, enabling runtime validation of AST-shaped data.

Grammar-driven schemas

Walks Langium's inferred AstTypes (interfaces, unions, primitives, cross-references) and emits a corresponding set of Zod schemas as a single TypeScript module.

Recursive type support

Detects cycles in the type graph and emits z.lazy(...) where required so recursive AST shapes validate correctly.

Cross-reference helper

Provides a zRef runtime helper so generated schemas can model Langium cross-references without losing type safety.

Langium DI integration

DefaultZodSchemaGenerator and ZodSchemaGeneratorModule let you register generation as a service on a custom language.

Configurable output

Control output paths and filter which types are emitted via FilterConfig and ZodGeneratorConfig.

Structured errors

Generation failures surface as ZodGeneratorError with enough context to pinpoint the grammar element at fault.