Function cargo_lambda_metadata::cargo::function_environment_metadata

pub fn function_environment_metadata<P: AsRef<Path>>(
    manifest_path: P,
    name: Option<&str>
) -> Result<HashMap<String, String>>

Create a HashMap of environment varibales from the package and workspace manifest See the documentation to learn about how we use this metadata: https://www.cargo-lambda.info/commands/watch.html#environment-variables