pub fn add_claim(
  jwt: #(header.Header, payload.Payload),
  claim: #(String, dynamic.Dynamic),
) -> #(header.Header, payload.Payload)

pub fn add_header(
  jwt: #(header.Header, payload.Payload),
  key: String,
  value: dynamic.Dynamic,
) -> #(header.Header, payload.Payload)

pub fn from_jwt(
  jwt_as_string: String,
  key: key.Key,
) -> Result(#(header.Header, payload.Payload), Nil)

pub fn new() -> #(header.Header, payload.Payload)

pub fn sign_off(
  jwt: #(header.Header, payload.Payload),
  key: key.Key,
) -> String

pub fn verify(jwt_as_string: String, key: key.Key) -> Bool