From b4d420f8ae8188960a7dfc36be76d6983a103e0c Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Thu, 25 Nov 2021 09:26:45 -0500
Subject: [PATCH] ignore hrefs with a scheme - fixes #2909

---
 packages/kit/src/utils/url.js      | 3 +++
 packages/kit/src/utils/url.spec.js | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/packages/kit/src/utils/url.js b/packages/kit/src/utils/url.js
index 486742357d0c..a0acf2aedaf4 100644
--- a/packages/kit/src/utils/url.js
+++ b/packages/kit/src/utils/url.js
@@ -1,10 +1,13 @@
 const absolute = /^([a-z]+:)?\/?\//;
+const scheme = /^[a-z]+:/;
 
 /**
  * @param {string} base
  * @param {string} path
  */
 export function resolve(base, path) {
+	if (scheme.test(path)) return path;
+
 	const base_match = absolute.exec(base);
 	const path_match = absolute.exec(path);
 
diff --git a/packages/kit/src/utils/url.spec.js b/packages/kit/src/utils/url.spec.js
index 11df39fee009..3d15d17a2cd1 100644
--- a/packages/kit/src/utils/url.spec.js
+++ b/packages/kit/src/utils/url.spec.js
@@ -46,4 +46,8 @@ test('resolves an absolute path', () => {
 	assert.equal(resolve('/a/b/c', 'https://example.com/foo'), 'https://example.com/foo');
 });
 
+test('handles schemes like tel: and mailto:', () => {
+	assert.equal(resolve('/a/b/c', 'mailto:hello@svelte.dev'), 'mailto:hello@svelte.dev');
+});
+
 test.run();