14 lines
569 B
TypeScript
14 lines
569 B
TypeScript
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/**
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* Given a URL as a string and a base URL it will make the URL relative
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* if the parsed protocol and host is the same as the one in the base
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* URL. Otherwise it returns the same URL string.
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*/
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export function relativizeURL(url: string | string, base: string | URL) {
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const baseURL = typeof base === 'string' ? new URL(base) : base
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const relative = new URL(url, base)
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const origin = `${baseURL.protocol}//${baseURL.host}`
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return `${relative.protocol}//${relative.host}` === origin
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? relative.toString().replace(origin, '')
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: relative.toString()
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}
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