Keep iife function comments in parentheses (#18538)

changelog_unreleased/javascript/18538.md

@@ -0,0 +1,35 @@
+#### Keep iife function comments in parentheses (#18538 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+const a = (
+  /**
+   * @param {number} foo
+   * @return {number}
+   */
+  function (foo) {
+    return foo + 1;
+  }
+)(1);
+
+// Prettier stable
+const a = /**
+ * @param {number} foo
+ * @return {number}
+ */
+(function (foo) {
+  return foo + 1;
+})(1);
+
+// Prettier main
+const a = (
+  /**
+   * @param {number} foo
+   * @return {number}
+   */
+  function (foo) {
+    return foo + 1;
+  }
+)(1);
+```