TypeScript-first schema validation with automatic static type inference from runtime schemas.

• Define schemas once and automatically infer TypeScript types for compile-time safety; supports primitives, objects, arrays, unions, and recursive types
• Validate data with parse() (throws) or safeParse() (returns result object); includes async validation for database lookups and external checks
• Transform and refine data during validation using transform(), refine(), and superRefine() for custom logic and cross-field validation
• Integrates seamlessly with React Hook Form, tRPC, Next.js, Express, Drizzle ORM, and environment variable validation
• Compose schemas by extending, merging, picking, omitting, and creating discriminated unions; customize error messages globally or per field