Typings for functions with no parameter are incorrect

[gndelia]

Functions such as getLastHeader don't have any parameter. However, the way the exposed function infers them requires in typescript to pass undefined as parameter, otherwise it won't work.

expected

const client = publicClient.extend(hemiPublicBitcoinKitActions())
client.getLastHeader() // Doesn't work in typescript; should not require any parameter, but it requires "undefined" passed to compile
client.getLastHeader(undefined) // works