CHANGELOG.md

@@ -2,6 +2,18 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## v1.5.2
+
+[compare changes](https://github.com/unjs/ufo/compare/v1.5.1...v1.5.2)
+
+### 🩹 Fixes
+
+- Use lookbehind regex only inside `joinRelativeURL` ([#226](https://github.com/unjs/ufo/pull/226))
+
+### ❤️ Contributors
+
+- Pooya Parsa ([@pi0](http://github.com/pi0))
+
 ## v1.5.1
 
 [compare changes](https://github.com/unjs/ufo/compare/v1.5.0...v1.5.1)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ufo",
-  "version": "1.5.1",
+  "version": "1.5.2",
   "description": "URL utils for humans",
   "repository": "unjs/ufo",
   "license": "MIT",
@@ -30,7 +30,7 @@
     "test": "pnpm lint && vitest run --typecheck"
   },
   "devDependencies": {
-    "@types/node": "^20.11.28",
+    "@types/node": "^20.11.30",
     "@vitest/coverage-v8": "^1.4.0",
     "automd": "^0.3.6",
     "changelogen": "^0.5.5",

src/utils.ts

@@ -345,8 +345,8 @@ export function joinURL(base: string, ...input: string[]): string {
  * @group utils
  */
 export function joinRelativeURL(..._input: string[]): string {
-  // Inlined regex to increase browser compatibiltiy for lookbehind (#224)
-  const JOIN_SEGMENT_SPLIT_RE = /(?<!\/)\/(?!\/)/;
+  // Inlined regex to increase browser compatibiltiy
+  const JOIN_SEGMENT_SPLIT_RE = /\/(?!\/)/;
 
   const input = _input.filter(Boolean);
 
@@ -358,7 +358,7 @@ export function joinRelativeURL(..._input: string[]): string {
     if (!i || i === "/") {
       continue;
     }
-    for (const s of i.split(JOIN_SEGMENT_SPLIT_RE)) {
+    for (const [sindex, s] of i.split(JOIN_SEGMENT_SPLIT_RE).entries()) {
       if (!s || s === ".") {
         continue;
       }
@@ -370,6 +370,11 @@ export function joinRelativeURL(..._input: string[]): string {
         segmentsDepth--;
         continue;
       }
+      // eslint-disable-next-line unicorn/prefer-at
+      if (sindex === 1 && segments[segments.length - 1]?.endsWith(":/")) {
+        segments[segments.length - 1] += "/" + s;
+        continue;
+      }
       segments.push(s);
       segmentsDepth++;
     }

test/join.test.ts

@@ -20,6 +20,10 @@ const joinURLTests = [
     input: ["https://google.com/", "./foo", "/bar"],
     out: "https://google.com/foo/bar",
   },
+  {
+    input: ["//google.com/", "./foo", "/bar"],
+    out: "//google.com/foo/bar",
+  },
 ] as const;
 
 describe("joinURL", () => {