File Content: index.js 'use strict'; module.exports = function (url) { if (typeof url !== 'string') { throw new TypeError('Expected a string, got ' + typeof url); } url = url.trim(); if (/^\.*\/|^(?!localhost)\w+:/.test(url)) { return url; } return url.replace(/^(?!(?:\w+:)?\/\/)/, 'http://'); }; Submit