pub fn read_string_opt<A, E, R>(path: &[&str]) -> Effect<A, E, R>where
A: From<Option<String>> + 'static,
E: From<ConfigError> + 'static,
R: NeedsConfigProvider + 'static,Expand description
Optional string — missing key yields None.
pub fn read_string_opt<A, E, R>(path: &[&str]) -> Effect<A, E, R>where
A: From<Option<String>> + 'static,
E: From<ConfigError> + 'static,
R: NeedsConfigProvider + 'static,Optional string — missing key yields None.