alternative to url-join or proper-url-join node modules

url-join-path.js

const path = require('path')
const assert = require('assert')

function urlJoinPath(url, pathToAdd) {
    const u = new URL(url)
    u.pathname = path.posix.join(u.pathname, pathToAdd)
    return u.href
}

let result1 = urlJoinPath('https://foo.bar/a/b', 'recordlogin')
console.log('url no trailing slash, pathToAdd no leading slash', '-->', result1) // result: 'https://foo.bar/a/b/recordlogin'
 
let result2 = urlJoinPath('https://foo.bar/a/b', '/recordlogin')
console.log('url no trailing slash, pathToAdd has leading slash', '-->', result2) // result: 'https://foo.bar/a/b/recordlogin'

let result3 = urlJoinPath('https://foo.bar/a/b/', 'recordlogin')
console.log('url has trailing slash, pathToAdd no leading slash', '-->', result3) // result: 'https://foo.bar/a/b/recordlogin'

let result4 = urlJoinPath('https://foo.bar/a/b/', '/recordlogin')
console.log('url has trailing slash, pathToAdd has leading slash', '-->', result4) // result: 'https://foo.bar/a/b/recordlogin'

assert.strictEqual(result1, result2)
assert.strictEqual(result1, result3)
assert.strictEqual(result3, result4)

code is https://creativecommons.org/publicdomain/mark/1.0/