Fix comment around nullish coalescing (#19652)

src/language-js/comments/handle-comments.js

@@ -15,6 +15,7 @@ import { isBlockComment, isLineComment } from "../utilities/comment-types.js";
 import { createTypeCheckFunction } from "../utilities/create-type-check-function.js";
 import { getFunctionParameters } from "../utilities/function-parameters.js";
 import { isMethod } from "../utilities/is-method.js";
+import { isNullishCoalescing } from "../utilities/is-nullish-coalescing.js";
 import { isObjectProperty } from "../utilities/is-object-property.js";
 import { isPrettierIgnoreComment } from "../utilities/is-prettier-ignore-comment.js";
 import { isTypeCastComment } from "../utilities/is-type-cast-comment.js";
@@ -70,6 +71,7 @@ function handleOwnLineComment(context) {
   return [
     handleCommentInEmptyParens,
     handleIgnoreComments,
+    handleClosureTypeCastComments,
     handleConditionalExpressionComments,
     handleLastFunctionParameterComments,
     handleMemberExpressionComments,
@@ -135,6 +137,7 @@ function handleRemainingComment(context) {
   return [
     handleCommentInEmptyParens,
     handleIgnoreComments,
+    handleClosureTypeCastComments,
     handleIfStatementComments,
     handleWhileLikeComments,
     handleSwitchStatementComments,
@@ -152,9 +155,21 @@ function handleRemainingComment(context) {
   ].some((fn) => fn(context));
 }
 
-function handleClosureTypeCastComments({ comment, followingNode }) {
+function handleClosureTypeCastComments({
+  comment,
+  followingNode,
+  enclosingNode,
+}) {
   if (followingNode && isTypeCastComment(comment)) {
-    addLeadingComment(followingNode, comment);
+    addLeadingComment(
+      // We'll add parentheses to the nullish coalescing expression,
+      // The comment need attach to the left side, so the comments can print inside it
+      enclosingNode?.type === "ConditionalExpression" &&
+        isNullishCoalescing(followingNode)
+        ? followingNode.left
+        : followingNode,
+      comment,
+    );
     return true;
   }
   return false;