npm-tips.txt

installed from npm, created LeftPad.js and LeftPad.purs
the JS file is 

import pkg from '@sevalkeles/padding';

const { leftpad } = pkg;

export const _leftpad = (s) => (n) => (c) => leftpad(s, n, c);

 
and the purs file:

module LeftPad where

foreign import _leftpad :: String -> Int -> String -> String


then, from spago repl:

import Prelude

> import LeftPad
> :t _leftpad
String -> Int -> String -> String

> _leftpad "whatever" 15 " "
"       whatever"