Environment variables look simple until one of them is missing, empty, malformed, or interpreted in a way your application did not expect.
In TypeScript projects, this can be easy to overlook. The code may be typed, the build may pass, and the app may still ship with broken configuration.
This is especially common in frontend builds, server-side rendering, backend services, CLI tools, Docker images, and CI/CD pipelines, where configuration is injected from outside the codebase.
That is the problem valitype is designed to address: strict, type-safe validation of environment variables with zero dependencies.
The problem with environment variables
