From 106a8774faece8df907532c1a7a5c81774b49c31 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Mond=C3=A9jar=20Rubio?=
 <mondejar1994@gmail.com>
Date: Tue, 20 May 2025 23:49:20 +0200
Subject: [PATCH 1/2] Support Leptos `class:` attributes

---
 crates/oxide/src/extractor/mod.rs | 17 +++++++++++++++++
 crates/oxide/src/scanner/mod.rs   |  2 +-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/crates/oxide/src/extractor/mod.rs b/crates/oxide/src/extractor/mod.rs
index 736deb28d4b9..33a3651f630e 100644
--- a/crates/oxide/src/extractor/mod.rs
+++ b/crates/oxide/src/extractor/mod.rs
@@ -1054,6 +1054,23 @@ mod tests {
         );
     }
 
+    // See: https://github.com/tailwindlabs/tailwindcss/issues/18092
+    #[test]
+    fn test_leptos_rs_view_class_colon_syntax() {
+        for (input, expected) in [
+            (
+                r#"<div class:px-6=true>"#,
+                vec!["class", "px-6"],
+            ),
+            (
+                r#"view! { <div class:px-6=true> }"#,
+                vec!["class", "px-6", "view!"],
+            ),
+        ] {
+            assert_extract_sorted_candidates(&pre_process_input(input, "svelte"), expected);
+        }
+    }
+
     #[test]
     fn test_extract_css_variables() {
         for (input, expected) in [
diff --git a/crates/oxide/src/scanner/mod.rs b/crates/oxide/src/scanner/mod.rs
index 05fcd71f19f7..0bd2b6574b3c 100644
--- a/crates/oxide/src/scanner/mod.rs
+++ b/crates/oxide/src/scanner/mod.rs
@@ -488,7 +488,7 @@ pub fn pre_process_input(content: &[u8], extension: &str) -> Vec<u8> {
         "pug" => Pug.process(content),
         "rb" | "erb" => Ruby.process(content),
         "slim" => Slim.process(content),
-        "svelte" => Svelte.process(content),
+        "svelte" | "rs" => Svelte.process(content),
         "vue" => Vue.process(content),
         _ => content.to_vec(),
     }

From 982b757b03576962957ca7712eed7d0a7f6572eb Mon Sep 17 00:00:00 2001
From: Robin Malfait <malfait.robin@gmail.com>
Date: Fri, 23 May 2025 12:11:19 +0200
Subject: [PATCH 2/2] update changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5fb9603d04b..5b5c30e89fc8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Upgrade: Do not migrate declarations that look like candidates in `<style>` blocks ([#18057](https://github.com/tailwindlabs/tailwindcss/pull/18057), [18068](https://github.com/tailwindlabs/tailwindcss/pull/18068))
 - Upgrade: Improve `pnpm` workspaces support ([#18065](https://github.com/tailwindlabs/tailwindcss/pull/18065))
+- Support Leptos `class:` attributes when extracting classes ([#18093](https://github.com/tailwindlabs/tailwindcss/pull/18093))
 
 ## [4.1.7] - 2025-05-15