From c52f9e78ed5649f4a608adf26e0ffd3fbbe436dd Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Thu, 29 Aug 2024 11:50:41 -0400
Subject: [PATCH 1/2] types(query): add $expr to RootQuerySelector

Fix #14841
Re: #14764
---
 test/types/queries.test.ts | 6 ++++++
 types/query.d.ts           | 1 +
 2 files changed, 7 insertions(+)

diff --git a/test/types/queries.test.ts b/test/types/queries.test.ts
index 5396f384cad..cafb98949cf 100644
--- a/test/types/queries.test.ts
+++ b/test/types/queries.test.ts
@@ -672,3 +672,9 @@ async function gh14545() {
   const myProjection = await M.findOne({}).select<SlimTest>({ prop: 1 }).exec();
   expectType<SlimTestDocument | null>(myProjection);
 }
+
+function gh14841() {
+  const filter: FilterQuery<{ owners: string[] }> = {
+    $expr: { $lt: [{ $size: "$owners" }, 10] },
+  };
+}
\ No newline at end of file
diff --git a/types/query.d.ts b/types/query.d.ts
index 572ec33e1df..0df0388c3d4 100644
--- a/types/query.d.ts
+++ b/types/query.d.ts
@@ -116,6 +116,7 @@ declare module 'mongoose' {
     $where?: string | Function;
     /** @see https://www.mongodb.com/docs/manual/reference/operator/query/comment/#op._S_comment */
     $comment?: string;
+    $expr?: Record<string, any>;
     // we could not find a proper TypeScript generic to support nested queries e.g. 'user.friends.name'
     // this will mark all unrecognized properties as any (including nested queries) only if
     // they include a "." (to avoid generically allowing any unexpected keys)

From 47950f42d559c18a6b9b6fb5445098ee12df955e Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Thu, 29 Aug 2024 15:23:30 -0400
Subject: [PATCH 2/2] style: fix lint

---
 test/types/queries.test.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/types/queries.test.ts b/test/types/queries.test.ts
index cafb98949cf..02998362434 100644
--- a/test/types/queries.test.ts
+++ b/test/types/queries.test.ts
@@ -675,6 +675,6 @@ async function gh14545() {
 
 function gh14841() {
   const filter: FilterQuery<{ owners: string[] }> = {
-    $expr: { $lt: [{ $size: "$owners" }, 10] },
+    $expr: { $lt: [{ $size: '$owners' }, 10] }
   };
-}
\ No newline at end of file
+}