From 61b473aacbfc652bb2be8275d02e19e14c109f4e Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Fri, 5 Jun 2026 17:37:05 +0800
Subject: [PATCH] Add test for #4032 (#19296)

---
 .../__snapshots__/format.test.js.snap         | 114 ++++++++++++++++++
 .../format/js/comments/return-statement-2.js  |  24 ++++
 2 files changed, 138 insertions(+)

diff --git a/tests/format/js/comments/__snapshots__/format.test.js.snap b/tests/format/js/comments/__snapshots__/format.test.js.snap
index 2eaf4615c..fdac21fab 100644
--- a/tests/format/js/comments/__snapshots__/format.test.js.snap
+++ b/tests/format/js/comments/__snapshots__/format.test.js.snap
@@ -6202,6 +6202,30 @@ function foo() {
   );
 }
 
+// #4032
+function transitionedFromBleepToBloop() {
+  return !!(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+
+  return Boolean(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+
+  return foo(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+}
+
 =====================================output=====================================
 function foo() {
   return (
@@ -6242,6 +6266,39 @@ function foo() {
   )
 }
 
+// #4032
+function transitionedFromBleepToBloop() {
+  return !!(
+    // Start with a bloop.
+    thing != null &&
+    thing.foo &&
+    thing.foo.bar === "bloop" &&
+    // End up with a bleep.
+    thing.foo &&
+    thing.foo.bar === "bleep"
+  )
+
+  return Boolean(
+    // Start with a bloop.
+    thing != null &&
+    thing.foo &&
+    thing.foo.bar === "bloop" &&
+    // End up with a bleep.
+    thing.foo &&
+    thing.foo.bar === "bleep",
+  )
+
+  return foo(
+    // Start with a bloop.
+    thing != null &&
+      thing.foo &&
+      thing.foo.bar === "bloop" &&
+      // End up with a bleep.
+      thing.foo &&
+      thing.foo.bar === "bleep",
+  )
+}
+
 ================================================================================
 `;
 
@@ -6288,6 +6345,30 @@ function foo() {
   );
 }
 
+// #4032
+function transitionedFromBleepToBloop() {
+  return !!(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+
+  return Boolean(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+
+  return foo(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+}
+
 =====================================output=====================================
 function foo() {
   return (
@@ -6328,6 +6409,39 @@ function foo() {
   );
 }
 
+// #4032
+function transitionedFromBleepToBloop() {
+  return !!(
+    // Start with a bloop.
+    thing != null &&
+    thing.foo &&
+    thing.foo.bar === "bloop" &&
+    // End up with a bleep.
+    thing.foo &&
+    thing.foo.bar === "bleep"
+  );
+
+  return Boolean(
+    // Start with a bloop.
+    thing != null &&
+    thing.foo &&
+    thing.foo.bar === "bloop" &&
+    // End up with a bleep.
+    thing.foo &&
+    thing.foo.bar === "bleep",
+  );
+
+  return foo(
+    // Start with a bloop.
+    thing != null &&
+      thing.foo &&
+      thing.foo.bar === "bloop" &&
+      // End up with a bleep.
+      thing.foo &&
+      thing.foo.bar === "bleep",
+  );
+}
+
 ================================================================================
 `;
 
diff --git a/tests/format/js/comments/return-statement-2.js b/tests/format/js/comments/return-statement-2.js
index 179d42486..1d2f15ecb 100644
--- a/tests/format/js/comments/return-statement-2.js
+++ b/tests/format/js/comments/return-statement-2.js
@@ -35,3 +35,27 @@ function foo() {
     a = b
   );
 }
+
+// #4032
+function transitionedFromBleepToBloop() {
+  return !!(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+
+  return Boolean(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+
+  return foo(
+    // Start with a bloop.
+    thing != null && (thing.foo && thing.foo.bar === 'bloop') &&
+    // End up with a bleep.
+    (thing.foo && thing.foo.bar === 'bleep')
+  );
+}