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/**
* The result of parsing a URL relative to a base URL.
*/
export type RelativeURL = {
/**
* The relative URL. Either a URL including the origin or a relative URL.
*/
url: string
/**
* Whether the URL is relative to the base URL.
*/
isRelative: boolean
}
export function parseRelativeURL(
url: string | URL,
base: string | URL
): RelativeURL {
const baseURL = typeof base === 'string' ? new URL(base) : base
const relative = new URL(url, base)
// The URL is relative if the origin is the same as the base URL.
const isRelative = relative.origin === baseURL.origin
return {
url: isRelative
? relative.toString().slice(baseURL.origin.length)
: relative.toString(),
isRelative,
}
}
/**
* Given a URL as a string and a base URL it will make the URL relative
* if the parsed protocol and host is the same as the one in the base
* URL. Otherwise it returns the same URL string.
*/
export function getRelativeURL(url: string | URL, base: string | URL): string {
const relative = parseRelativeURL(url, base)
return relative.url
}
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