Crate const_dotenvy 

A procedural macro to read environment variables at compile-time and embed them as expressions in the code.

This is useful for embedding configuration values in the environments where you can’t read a .env file at runtime, for example on an esp32 microcontroller.

Example

use const_dotenvy::dotenvy;

let (host, port, use_tls): (&str, u16, bool) = dotenvy!(
    HOST: &'static str,
    PORT: u16 = 8080,
    USE_TLS: bool = false
);

assert_eq!(host, "localhost");
assert_eq!(port, 8080);
assert_eq!(use_tls, false);

Macros

dotenvy

This macro reads environment variables at compile-time from the .env file or optionally from the environment, then emits a literal containing the value. You can specify a type and a default value, if the variable is optional.