Fix duplicated comments on prettier-ignored super class (#18168)

src/language-js/comments/printer-methods.js

@@ -151,32 +151,26 @@ function canAttachComment(node, ancestors) {
  * @returns {boolean}
  */
 function willPrintOwnComments(path) {
-  const { node, parent, key } = path;
+  const { key, parent } = path;
   if (
     (key === "types" && isUnionType(parent)) ||
     (key === "argument" && parent.type === "JSXSpreadAttribute") ||
-    (key === "expression" && parent.type === "JSXSpreadChild")
+    (key === "expression" && parent.type === "JSXSpreadChild") ||
+    (key === "superClass" &&
+      (parent.type === "ClassDeclaration" ||
+        parent.type === "ClassExpression")) ||
+    // Not tested, don't know how to
+    (key === "patterns" && parent.type === "MatchOrPattern")
   ) {
     return true;
   }
 
+  const { node } = path;
   if (hasNodeIgnoreComment(node)) {
     return false;
   }
 
-  if (isJsxElement(node) || isUnionType(node)) {
-    return true;
-  }
-
-  if (!parent) {
-    return false;
-  }
-
-  return (
-    parent.type === "MatchOrPattern" ||
-    (path.key === "superClass" &&
-      (parent.type === "ClassDeclaration" || parent.type === "ClassExpression"))
-  );
+  return isJsxElement(node) || isUnionType(node);
 }
 
 function isGap(text, { parser }) {

tests/format/js/class-comment/__snapshots__/format.test.js.snap

@@ -97,6 +97,9 @@ class C2  // comment
 extends Base
 {  foo(){} }
 
+(class A10 extends /* a */ /* prettier-ignore */B {});
+class A10 extends /* a */ /* prettier-ignore */B {}
+
 =====================================output=====================================
 class A // comment 1
 // comment 2
@@ -142,5 +145,8 @@ class C2 // comment
   foo() {}
 }
 
+(class A10 extends /* a */ /* prettier-ignore */ B {});
+class A10 extends /* a */ /* prettier-ignore */ B {}
+
 ================================================================================
 `;

tests/format/js/class-comment/superclass.js

@@ -38,3 +38,6 @@ class c extends d
 class C2  // comment
 extends Base
 {  foo(){} }
+
+(class A10 extends /* a */ /* prettier-ignore */B {});
+class A10 extends /* a */ /* prettier-ignore */B {}