discourse/app/assets/javascripts/discourse-common/lib/get-url.js.es6

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let baseUri;
export default function getURL(url) {
if (!url) return url;
if (!baseUri) {
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baseUri = $('meta[name="discourse-base-uri"]').attr("content") || "";
}
// if it's a non relative URL, return it.
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if (url !== "/" && !/^\/[^\/]/.test(url)) return url;
const found = url.indexOf(baseUri);
if (found >= 0 && found < 3) return url;
if (url[0] !== "/") url = "/" + url;
return baseUri + url;
}