@thwack/resolve

What is it?

• Functionally equivalent to new URL(url, base).href
• Works on browsers, NodeJS, and React Native
• Tiny.
• Has loads of tests that use JSDOM's WHATWG URL as its expected results

What it's not?

• It is not, nor does it intend to be, a replacement for URL (i.e. an implementation of the WHATWG URL Standard )
• If you need to full URL replacement, see whatwg-url.

Why?

I needed to resolve a URL against a base when writing Thwack. Initially I used new URL(url, base).href, but found that it failed when running on React Native as its implimenation of URL sucks (to put it mildly).

I initially imported react-native-url-polyfill but it's 41k, which is more than 10x Thwack itself!

So I set out to write my own and share it with the world.

Installation

$ npm i @thwack/resolve

or

$ yarn add @thwack/resolve

The RegEx

It is based on the RegEx in the RFC for Uniform Resource Identifier (i.e. the URL syntax for the internet)

^(([^:\/?#]+):)?(\/\/([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?

see https://tools.ietf.org/html/rfc3986#appendix-B

The RegEx returns:

$1 = http:
$2 = http                //protocol
$3 = //www.example.com
$4 = www.example.com     //domain
$5 = /foo/bar/ or foo    //path
$6 = ?a=b                //search
$7 = a=b
$8 = #hash               //hash
$9 = hash

Note 1: all but $5 will be undefined if missing. $5 will be ""

Note 2: $5 will be "undefined" (a string) if uri is undefined

Note 3: $4 will be undefined if missing or "" if present but blank

License

Licensed under MIT