diff --git a/crates/swc/tests/fixture/issues-6xxx/6255/1/input/input.js b/crates/swc/tests/fixture/issues-6xxx/6255/1/input/input.js
new file mode 100644
index 00000000000..0005abdbc6e
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-6xxx/6255/1/input/input.js
@@ -0,0 +1,6 @@
+function test(node) {
+    return (
+        // comment from the source code
+        (_a = node.modifiers) === null || _a === void 0 ? void 0 : _a.filter((m) => !ts.isDecorator(m))
+    );
+}
diff --git a/crates/swc/tests/fixture/issues-6xxx/6255/1/output/input.js b/crates/swc/tests/fixture/issues-6xxx/6255/1/output/input.js
new file mode 100644
index 00000000000..18b1a73eaaa
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-6xxx/6255/1/output/input.js
@@ -0,0 +1,6 @@
+function test(node) {
+    return(// comment from the source code
+    (_a = node.modifiers) === null || _a === void 0 ? void 0 : _a.filter(function(m) {
+        return !ts.isDecorator(m);
+    }));
+}
diff --git a/crates/swc_ecma_codegen/src/lib.rs b/crates/swc_ecma_codegen/src/lib.rs
index 14447057fe0..2b88143c891 100644
--- a/crates/swc_ecma_codegen/src/lib.rs
+++ b/crates/swc_ecma_codegen/src/lib.rs
@@ -2736,6 +2736,12 @@ where
                 }
             }
 
+            Expr::Cond(e) => {
+                if self.has_leading_comment(&e.test) {
+                    return true;
+                }
+            }
+
             Expr::Seq(e) => {
                 if let Some(e) = e.exprs.first() {
                     if self.has_leading_comment(e) {
@@ -2744,6 +2750,22 @@ where
                 }
             }
 
+            Expr::Assign(e) => {
+                if let Some(cmt) = self.comments {
+                    let lo = e.span.lo;
+
+                    if cmt.has_leading(lo) {
+                        return true;
+                    }
+                }
+
+                if let Some(e) = e.left.as_expr() {
+                    if self.has_leading_comment(e) {
+                        return true;
+                    }
+                }
+            }
+
             _ => {}
         }