From e8900da9166892533f57094802dca9866fd7ca1f Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Mon, 8 Jun 2026 20:46:59 +0800
Subject: [PATCH] Remove extra group around object properties (#19310)

---
 changelog_unreleased/javascript/19310.md      | 20 +++++
 src/language-js/print/object.js               |  2 +-
 .../__snapshots__/format.test.js.snap         | 12 ++-
 .../typescript/object-type/comments/11308.ts  | 35 ++++++++
 .../__snapshots__/format.test.js.snap         | 87 +++++++++++++++++++
 5 files changed, 151 insertions(+), 5 deletions(-)
 create mode 100644 changelog_unreleased/javascript/19310.md
 create mode 100644 tests/format/typescript/object-type/comments/11308.ts

diff --git a/changelog_unreleased/javascript/19310.md b/changelog_unreleased/javascript/19310.md
new file mode 100644
index 000000000..4eee19ebb
--- /dev/null
+++ b/changelog_unreleased/javascript/19310.md
@@ -0,0 +1,20 @@
+#### Improve formatting of comments in objects (#19310 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+const P = {/** X */
+  Y: "z",
+}
+
+// Prettier stable
+const P = {
+  /** X */ Y: "z",
+};
+
+// Prettier main
+const P = {
+  /** X */
+  Y: "z",
+};
+```
diff --git a/src/language-js/print/object.js b/src/language-js/print/object.js
index 15adb6fa1..d7eb01655 100644
--- a/src/language-js/print/object.js
+++ b/src/language-js/print/object.js
@@ -105,7 +105,7 @@ function printObject(path, options, print) {
   /** @type {Doc[]} */
   let separatorParts = [];
   const parts = path.map(({ node }) => {
-    const result = [...separatorParts, group(print())];
+    const result = [...separatorParts, print()];
     separatorParts = [",", line];
     if (isNextLineEmpty(node, options)) {
       separatorParts.push(hardline);
diff --git a/tests/format/js/comments/__snapshots__/format.test.js.snap b/tests/format/js/comments/__snapshots__/format.test.js.snap
index fdac21fab..b1c6bb994 100644
--- a/tests/format/js/comments/__snapshots__/format.test.js.snap
+++ b/tests/format/js/comments/__snapshots__/format.test.js.snap
@@ -6598,7 +6598,8 @@ var a = { /* comment */
 b };
 =====================================output=====================================
 var a = {
-  /* comment */ b,
+  /* comment */
+  b,
 }
 
 ================================================================================
@@ -6613,7 +6614,8 @@ var a = { /* comment */
 b };
 =====================================output=====================================
 var a = {
-  /* comment */ b,
+  /* comment */
+  b,
 };
 
 ================================================================================
@@ -6629,7 +6631,8 @@ var a = { /* comment */
 b };
 =====================================output=====================================
 var a = {
-  /* comment */ b,
+  /* comment */
+  b,
 }
 
 ================================================================================
@@ -6644,7 +6647,8 @@ var a = { /* comment */
 b };
 =====================================output=====================================
 var a = {
-  /* comment */ b,
+  /* comment */
+  b,
 };
 
 ================================================================================
diff --git a/tests/format/typescript/object-type/comments/11308.ts b/tests/format/typescript/object-type/comments/11308.ts
new file mode 100644
index 000000000..56ee93159
--- /dev/null
+++ b/tests/format/typescript/object-type/comments/11308.ts
@@ -0,0 +1,35 @@
+o = {/** X */
+  Y: "z",
+}
+o = {// X
+  Y: "z",
+}
+o = {
+/** X */
+  Y: "z",
+}
+o = {
+/** X */ Y: "z",
+}
+o = {/** X */
+  Y: "z",
+  /** X */ Z: 1,
+}
+
+type T1 = {/** X */
+  Y: "z",
+}
+type T2 = {// X
+  Y: "z",
+}
+type T3 = {
+/** X */
+  Y: "z",
+}
+type T4 = {
+/** X */ Y: "z",
+}
+type T5 = {/** X */
+  Y: "z",
+  /** X */ Z: 1,
+}
diff --git a/tests/format/typescript/object-type/comments/__snapshots__/format.test.js.snap b/tests/format/typescript/object-type/comments/__snapshots__/format.test.js.snap
index 87bc8e47d..3dd0add4f 100644
--- a/tests/format/typescript/object-type/comments/__snapshots__/format.test.js.snap
+++ b/tests/format/typescript/object-type/comments/__snapshots__/format.test.js.snap
@@ -50,3 +50,90 @@ o = /** K */ {
 
 ================================================================================
 `;
+
+exports[`11308.ts format 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+o = {/** X */
+  Y: "z",
+}
+o = {// X
+  Y: "z",
+}
+o = {
+/** X */
+  Y: "z",
+}
+o = {
+/** X */ Y: "z",
+}
+o = {/** X */
+  Y: "z",
+  /** X */ Z: 1,
+}
+
+type T1 = {/** X */
+  Y: "z",
+}
+type T2 = {// X
+  Y: "z",
+}
+type T3 = {
+/** X */
+  Y: "z",
+}
+type T4 = {
+/** X */ Y: "z",
+}
+type T5 = {/** X */
+  Y: "z",
+  /** X */ Z: 1,
+}
+
+=====================================output=====================================
+o = {
+  /** X */
+  Y: "z",
+};
+o = {
+  // X
+  Y: "z",
+};
+o = {
+  /** X */
+  Y: "z",
+};
+o = {
+  /** X */ Y: "z",
+};
+o = {
+  /** X */
+  Y: "z",
+  /** X */ Z: 1,
+};
+
+type T1 = {
+  /** X */
+  Y: "z";
+};
+type T2 = {
+  // X
+  Y: "z";
+};
+type T3 = {
+  /** X */
+  Y: "z";
+};
+type T4 = {
+  /** X */ Y: "z";
+};
+type T5 = {
+  /** X */
+  Y: "z";
+  /** X */ Z: 1;
+};
+
+================================================================================
+`;