Developer Builds Typed, Zero-Dependency Library to Simplify Environment Variable Validation

A developer frustrated by repeated environment variable bugs in production codebases built a lightweight TypeScript library called ctroenv to address the problem. The library lets developers define a typed schema for environment variables, automatically coercing types, applying defaults, and throwing clear errors at import time if values are missing or invalid. It includes built-in support for secret masking via a Proxy wrapper, preventing accidental credential leaks through stray console logs. A companion CLI tool enables CI pipeline validation, flagging missing or mismatched variables and even catching typos in .env files. The library also offers framework-specific integrations for Next.js and Vite, enforcing environment validation at both runtime and build time.