fix: comment position in anonymous class (#1580)

Fixes #1546

Author: czosel

src/comments.js

@@ -497,6 +497,16 @@ function handleClassComments(enclosingNode, followingNode, comment) {
       return true;
     }
   }
+
+  if (
+    followingNode &&
+    followingNode.kind === "class" &&
+    followingNode.isAnonymous &&
+    followingNode.leadingComments &&
+    comment.kind === "commentblock"
+  ) {
+    return true;
+  }
   return false;
 }
 

src/printer.js

@@ -2143,6 +2143,13 @@ function printNode(path, options, print) {
 
       if (isAnonymousClassNode) {
         parts.push(
+          node.what.leadingComments &&
+            node.what.leadingComments[0].kind === "commentblock"
+            ? concat([
+                comments.printComments(node.what.leadingComments, options),
+                " ",
+              ])
+            : "",
           "class",
           node.arguments.length > 0
             ? concat([" ", printArgumentsList(path, options, print)])

tests/comments/__snapshots__/jsfmt.spec.js.snap

@@ -859,6 +859,8 @@ $var = new class {
     // Comment
 };
 
+$foo = /*a*/ new /* b */ class {};
+
 =====================================output=====================================
 <?php
 namespace Test\\test\\test;
@@ -1001,6 +1003,8 @@ $var = new class {
     // Comment
 };
 
+$foo = /*a*/ new /* b */ class {};
+
 ================================================================================
 `;
 

tests/comments/class.php

@@ -134,3 +134,5 @@ class MyClass
 $var = new class {
     // Comment
 };
+
+$foo = /*a*/ new /* b */ class {};