Fix comment in abstract methods (#12185)

changelog_unreleased/javascript/12185.md

@@ -0,0 +1,26 @@
+#### Fix misplaced argument comment in abstract methods (#12185 by @duailibe)
+
+<!-- prettier-ignore -->
+```ts
+// Input
+abstract class Foo {
+  abstract bar(
+    /** comment explaining userId param */
+    userId
+  )
+}
+
+// Prettier stable
+abstract class Foo {
+  abstract bar(userId);
+  /** comment explaining userId param */
+}
+
+// Prettier main
+abstract class Foo {
+  abstract bar(
+    /** comment explaining userId param */
+    userId
+  );
+}
+```