From 28fca3c9b7b53ee230554f390950a857d1770512 Mon Sep 17 00:00:00 2001
From: Boshen <1430279+Boshen@users.noreply.github.com>
Date: Thu, 3 Jul 2025 06:32:27 +0000
Subject: [PATCH] feat(codegen): preserve comments for lingui /*i18n*/ (#12047)

closes https://github.com/rolldown/rolldown/issues/5118
---
 crates/oxc_codegen/src/gen.rs                    | 3 +++
 crates/oxc_codegen/tests/integration/comments.rs | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/crates/oxc_codegen/src/gen.rs b/crates/oxc_codegen/src/gen.rs
index fdb9c49a9dff8..0b6314b7548db 100644
--- a/crates/oxc_codegen/src/gen.rs
+++ b/crates/oxc_codegen/src/gen.rs
@@ -1482,6 +1482,9 @@ impl GenExpr for ObjectExpression<'_> {
         let is_multi_line = len > 1;
         let wrap = p.start_of_stmt == n || p.start_of_arrow_expr == n;
         p.wrap(wrap, |p| {
+            // Print comments for lingui https://lingui.dev/ref/macro#definemessage
+            // `const message = /*i18n*/ { };`
+            p.print_leading_comments(self.span.start);
             p.add_source_mapping(self.span);
             p.print_ascii_byte(b'{');
             if is_multi_line {
diff --git a/crates/oxc_codegen/tests/integration/comments.rs b/crates/oxc_codegen/tests/integration/comments.rs
index 82b3beadad137..a844865dc7778 100644
--- a/crates/oxc_codegen/tests/integration/comments.rs
+++ b/crates/oxc_codegen/tests/integration/comments.rs
@@ -3,6 +3,8 @@ use crate::tester::test_same;
 #[test]
 fn unit() {
     test_same("<div>{/* Hello */}</div>;\n");
+    // https://lingui.dev/ref/macro#definemessage
+    test_same("const message = /*i18n*/{};\n");
 }
 
 pub mod jsdoc {