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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
"use strict";
exports.getSourcemapBaseURL = getSourcemapBaseURL;
function getSourcemapBaseURL(url, global) {
let sourceMapBaseURL = null;
if (url) {
// Sources that have explicit URLs can be used directly as the base.
sourceMapBaseURL = url;
} else if (global?.location?.href) {
// If there is no URL for the source, the map comment is relative to the
// page being viewed, so we use the document href.
sourceMapBaseURL = global?.location?.href;
} else {
// If there is no valid base, the sourcemap URL will need to be an absolute
// URL of some kind.
return null;
}
// A data URL is large and will never be a valid base, so we can just treat
// it as if there is no base at all to avoid a sending it to the client
// for no reason.
if (sourceMapBaseURL.startsWith("data:")) {
return null;
}
// If the base URL is a blob, we want to resolve relative to the origin
// that created the blob URL, if there is one.
if (sourceMapBaseURL.startsWith("blob:")) {
try {
const parsedBaseURL = new URL(sourceMapBaseURL);
return parsedBaseURL.origin === "null" ? null : parsedBaseURL.origin;
} catch (err) {
return null;
}
}
return sourceMapBaseURL;
}