env

With no external libraries, env keeps Go builds minimal and fast, reducing dependency bloat and simplifying maintenance, as highlighted in the README's philosophy.

Handles built-in Go types, pointers, slices, maps, and complex types like time.Duration and url.URL, plus custom types via encoding.TextUnmarshaler, offering extensive out-of-the-box functionality.

Uses struct tags like `required` and `envDefault` to enforce rules and set defaults, eliminating boilerplate code for common configuration checks.

Supports reading values from files with the `file` tag and expanding nested environment variables via the `expand` tag, adding flexibility for security and dynamic configurations.

Offers generics support, custom prefixes, and hooks through ParseWithOptions, allowing fine-grained control over parsing behavior without compromising simplicity.