biomejs · ematipico · Nov 29, 2025 · Nov 28, 2025 · Nov 28, 2025
diff --git a/.changeset/calm-foxes-dance.md b/.changeset/calm-foxes-dance.md
@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed [#8109](https://github.com/biomejs/biome/issues/8109): return statements in Astro frontmatter no longer trigger "Illegal return statement" errors when using `experimentalFullSupportEnabled`.
diff --git a/crates/biome_cli/tests/cases/handle_astro_files.rs b/crates/biome_cli/tests/cases/handle_astro_files.rs
@@ -718,3 +718,33 @@ function foo(){console.log("Hello")}
         result,
     ));
 }
+
+#[test]
+fn does_not_throw_parse_error_for_return_full_support() {
+    let fs = MemoryFileSystem::default();
+    let mut console = BufferConsole::default();
+
+    fs.insert(
+        "biome.json".into(),
+        r#"{ "html": { "experimentalFullSupportEnabled": true } }"#.as_bytes(),
+    );
+
+    let astro_file_path = Utf8Path::new("file.astro");
+    fs.insert(astro_file_path.into(), ASTRO_RETURN.as_bytes());
+
+    let (fs, result) = run_cli(
+        fs,
+        &mut console,
+        Args::from(["lint", astro_file_path.as_str()].as_slice()),
+    );
+
+    assert!(result.is_ok(), "run_cli returned {result:?}");
+
+    assert_cli_snapshot(SnapshotPayload::new(
+        module_path!(),
+        "does_not_throw_parse_error_for_return_full_support",
+        fs,
+        console,
+        result,
+    ));
+}
diff --git a/...ots/main_cases_handle_astro_files/does_not_throw_parse_error_for_return_full_support.snap b/...ots/main_cases_handle_astro_files/does_not_throw_parse_error_for_return_full_support.snap
@@ -0,0 +1,28 @@
+---
+source: crates/biome_cli/tests/snap_test.rs
+expression: redactor(content)
+---
+## `biome.json`
+
+```json
+{ "html": { "experimentalFullSupportEnabled": true } }
+```
+
+## `file.astro`
+
+```astro
+---
+const foo = true;
+if (foo) {
+    return "Something";
+}
+
+---
+<div></div>
+```
+
+# Emitted Messages
+
+```block
+Checked 1 file in <TIME>. No fixes applied.
+```
diff --git a/crates/biome_js_syntax/src/file_source.rs b/crates/biome_js_syntax/src/file_source.rs
@@ -132,7 +132,7 @@ pub enum EmbeddingKind {
 
 impl EmbeddingKind {
     pub const fn is_astro(&self) -> bool {
-        matches!(self, Self::Astro { frontmatter: false })
+        matches!(self, Self::Astro { .. })
     }
     pub const fn is_astro_frontmatter(&self) -> bool {
         matches!(self, Self::Astro { frontmatter: true })