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-rw-r--r--devtools/shared/path.js27
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diff --git a/devtools/shared/path.js b/devtools/shared/path.js
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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
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/*
+ * Join all the arguments together and normalize the resulting URI.
+ * The initial path must be an full URI with a protocol (i.e. http://).
+ */
+exports.joinURI = (initialPath, ...paths) => {
+ let url;
+
+ try {
+ url = new URL(initialPath);
+ } catch (e) {
+ return null;
+ }
+
+ for (const path of paths) {
+ if (path) {
+ url = new URL(path, url);
+ }
+ }
+
+ return url.href;
+};