Traditional CLI libraries like Commander.js and Yargs often suffer from a gap between runtime validation and TypeScript type safety, where mutually exclusive options are typed as flat collections of optional fields. This disconnect forces developers to rely on manual type narrowing or risky non-null assertions, even when the underlying validator knows exactly which inputs are incompatible. Optique 1.0 addresses this by utilizing parser combinators to generate precise discriminated unions that reflect the true structure of the command-line interface. By modeling options as structural components rather than independent flags, the library ensures the compiler accurately represents available fields, effectively eliminating the need for boilerplate validation logic. The 1.0 release expands this philosophy to include environment variables, configuration files, and interactive prompts, treating all input sources as a single unified problem. It enforces consistent validation across every layer, ensuring that constraints defined for the CLI are never bypassed by values arriving from the environment or filesystem. This approach is essential for building robust, type-safe command-line tools that remain maintainable as their complexity and configuration sources grow.