toRootRelativePath

See source on Github 

Transforms a given path to be root relative.

• @param str - The path or absolute URL to transform.
• @returns The root-relative path, or the original absolute URL.

Example

toRootRelativePath('foo/bar') // '/foo/bar'
toRootRelativePath('/foo/bar') // '/foo/bar'
toRootRelativePath('http://google.com/foo/bar') // 'http://google.com/foo/bar'

See

• https://developer.mozilla.org/en-US/docs/Web/API/URL_API/Resolving_relative_references#root_relative