flow-typer-js
Declarative static and runtime type checking with Flow
type-sentry
A powerful TypeScript library for runtime type checking and validation using decorators
typed-env-parser
Simple environment parser with full typescript inferring support
bguard
**bguard** is a powerful, flexible, and type-safe validation library for TypeScript. It allows developers to define validation schemas for their data structures and ensures that data conforms to the expected types and constraints.