'use strict'; module.exports = url => { if (typeof url !== 'string') { throw new TypeError(`Expected a \`string\`, got \`${typeof url}\``); } // Don't match Windows paths `c:\` if (/^[a-zA-Z]:\\/.test(url)) { return false; } // Scheme: https://tools.ietf.org/html/rfc3986#section-3.1 // Absolute URL: https://tools.ietf.org/html/rfc3986#section-4.3 return /^[a-zA-Z][a-zA-Z\d+\-.]*:/.test(url); };