pub fn get_env(key: String, default_value: String) -> String

pub fn get_env_int(key: String, default_value: Int) -> Int

pub fn http_get_text(
  url: String,
  headers: List(#(String, String)),
) -> Result(String, String)

pub fn now() -> Float

pub fn print(val: a) -> String

pub fn println(val: a) -> String

pub fn read_file(filepath: String) -> Result(BitArray, String)

pub fn read_text_file(filepath: String) -> Result(String, String)

pub fn readline(prompt: String) -> String

pub fn run_test() -> String

pub fn show(val: a) -> String