JSPM

A comprehensive collection of performant type guards and assertions with excellent TypeScript support

A schema validation library for TypeScript inspired by Zod. Includes features like type inference, runtime validation, and type-safe schema definition.

JavaScript runtime type inference utilities.

Type-safe assertion library for TypeScript

ENVSAURUS is a zero-dependency CLI + library that turns your .env.example into a fully typed config file. It validates environment variables at runtime, fails fast in CI, and exports a safe CONFIG object for Node/TypeScript apps. Catch missing or invalid

code which aids with untyped javascript