From eb0155289f3e2e46ea551b624426e48a5bbc048d Mon Sep 17 00:00:00 2001
From: Sarath Francis <sarathfrancis90@gmail.com>
Date: Wed, 3 Jun 2026 13:20:50 -0400
Subject: [PATCH] Fix unstable trailing comment on a parenthesized assignment
 statement (#19276)

Co-authored-by: fisker <lionkay@gmail.com>
---
 src/language-js/comments/handle-comments.js   | 11 +++--
 .../__snapshots__/format.test.js.snap         | 48 ++++++++++++++++---
 ...parenthesized-trailing-comment-unstable.js |  2 -
 .../parenthesized-trailing-comment.js         | 25 +++++++++-
 4 files changed, 73 insertions(+), 13 deletions(-)

diff --git a/src/language-js/comments/handle-comments.js b/src/language-js/comments/handle-comments.js
index 0fe5dc995..c7fc2e80f 100644
--- a/src/language-js/comments/handle-comments.js
+++ b/src/language-js/comments/handle-comments.js
@@ -1081,6 +1081,14 @@ function handleParenthesizedExpressionTrailingComment({
   text,
 }) {
   if (!followingNode && enclosingNode) {
+    if (
+      enclosingNode.type === "ExpressionStatement" &&
+      enclosingNode.expression === precedingNode
+    ) {
+      addTrailingComment(enclosingNode, comment);
+      return true;
+    }
+
     const isSequence = precedingNode?.type === "SequenceExpression";
     const isAssignment = precedingNode?.type === "AssignmentExpression";
 
@@ -1092,9 +1100,6 @@ function handleParenthesizedExpressionTrailingComment({
           enclosingNode.init === precedingNode) ||
         (enclosingNode.type === "ReturnStatement" &&
           enclosingNode.argument === precedingNode) ||
-        (isSequence &&
-          enclosingNode.type === "ExpressionStatement" &&
-          enclosingNode.expression === precedingNode) ||
         (isSequence &&
           enclosingNode.type === "AssignmentExpression" &&
           enclosingNode.right === precedingNode)) &&
diff --git a/tests/format/js/sequence-expression/__snapshots__/format.test.js.snap b/tests/format/js/sequence-expression/__snapshots__/format.test.js.snap
index 2aedc70df..fbec30c5c 100644
--- a/tests/format/js/sequence-expression/__snapshots__/format.test.js.snap
+++ b/tests/format/js/sequence-expression/__snapshots__/format.test.js.snap
@@ -136,7 +136,30 @@ const x1 = (a, b, c /* comment */);
 const x2 = (a = c /* comment */);
 
 (a, b, c /* comment */);
-// (a = c /* comment */);
+(a, b, c /* comment */
+);
+(a, b, c
+/* comment */
+);
+(a = c /* comment */);
+(a = c /* comment */
+);
+(a = c
+/* comment */
+);
+({a} = c /* comment */);
+({a} = c
+/* comment */
+);
+({a} = c /* comment */
+);
+
+(foo() /* comment */);
+(foo()
+/* comment */
+);
+(foo() /* comment */
+);
 
 assigned = (a, b, c /* comment */);
 // assigned = (a = c /* comment */);
@@ -150,8 +173,23 @@ function f() {
 const x1 = (a, b, c /* comment */);
 const x2 = (a = c /* comment */);
 
-(a, b, c /* comment */);
-// (a = c /* comment */);
+(a, b, c); /* comment */
+(a, b, c); /* comment */
+(a, b, c);
+/* comment */
+a = c; /* comment */
+a = c; /* comment */
+a = c;
+/* comment */
+({ a } = c); /* comment */
+({ a } = c);
+/* comment */
+({ a } = c); /* comment */
+
+foo(); /* comment */
+foo();
+/* comment */
+foo(); /* comment */
 
 assigned = (a, b, c /* comment */);
 // assigned = (a = c /* comment */);
@@ -171,15 +209,11 @@ parsers: ["babel", "flow", "typescript"]
 =====================================input======================================
 // TODO: Enable tests in parenthesized-trailing-comment.js when they are stable
 
-(a = c /* comment */);
-
 assigned = (a = c /* comment */);
 
 =====================================output=====================================
 // TODO: Enable tests in parenthesized-trailing-comment.js when they are stable
 
-a = c /* comment */;
-
 assigned = a = c /* comment */;
 
 ================================================================================
diff --git a/tests/format/js/sequence-expression/parenthesized-trailing-comment-unstable.js b/tests/format/js/sequence-expression/parenthesized-trailing-comment-unstable.js
index 659db507c..9cb146df4 100644
--- a/tests/format/js/sequence-expression/parenthesized-trailing-comment-unstable.js
+++ b/tests/format/js/sequence-expression/parenthesized-trailing-comment-unstable.js
@@ -1,5 +1,3 @@
 // TODO: Enable tests in parenthesized-trailing-comment.js when they are stable
 
-(a = c /* comment */);
-
 assigned = (a = c /* comment */);
diff --git a/tests/format/js/sequence-expression/parenthesized-trailing-comment.js b/tests/format/js/sequence-expression/parenthesized-trailing-comment.js
index 92ac2f5b4..3db517fe7 100644
--- a/tests/format/js/sequence-expression/parenthesized-trailing-comment.js
+++ b/tests/format/js/sequence-expression/parenthesized-trailing-comment.js
@@ -2,7 +2,30 @@ const x1 = (a, b, c /* comment */);
 const x2 = (a = c /* comment */);
 
 (a, b, c /* comment */);
-// (a = c /* comment */);
+(a, b, c /* comment */
+);
+(a, b, c
+/* comment */
+);
+(a = c /* comment */);
+(a = c /* comment */
+);
+(a = c
+/* comment */
+);
+({a} = c /* comment */);
+({a} = c
+/* comment */
+);
+({a} = c /* comment */
+);
+
+(foo() /* comment */);
+(foo()
+/* comment */
+);
+(foo() /* comment */
+);
 
 assigned = (a, b, c /* comment */);
 // assigned = (a = c /* comment */);