From c520587077be83bfd4154d9d0e88753bb1ccfb66 Mon Sep 17 00:00:00 2001
From: Phillip Huang <phillip@vanta.com>
Date: Fri, 4 Aug 2023 15:57:00 -0700
Subject: [PATCH 1/2] Backport empty bulkwrite fix #13684 to Mongoose v6

---
 lib/model.js       | 26 +++++++++++++++-----------
 test/model.test.js |  9 +++++++++
 2 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/lib/model.js b/lib/model.js
index 07bd9ef43b0..b4f6596f676 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -3772,17 +3772,21 @@ Model.bulkWrite = function(ops, options, callback) {
     let remaining = validations.length;
     let validOps = [];
     let validationErrors = [];
-    for (let i = 0; i < validations.length; ++i) {
-      validations[i]((err) => {
-        if (err == null) {
-          validOps.push(i);
-        } else {
-          validationErrors.push({ index: i, error: err });
-        }
-        if (--remaining <= 0) {
-          completeUnorderedValidation.call(this);
-        }
-      });
+    if (remaining === 0) {
+      completeUnorderedValidation.call(this)
+    } else {
+      for (let i = 0; i < validations.length; ++i) {
+        validations[i]((err) => {
+          if (err == null) {
+            validOps.push(i);
+          } else {
+            validationErrors.push({ index: i, error: err });
+          }
+          if (--remaining <= 0) {
+            completeUnorderedValidation.call(this);
+          }
+        });
+      }
     }
 
     validationErrors = validationErrors.
diff --git a/test/model.test.js b/test/model.test.js
index 848a1d6455b..b9b0ff0f3f6 100644
--- a/test/model.test.js
+++ b/test/model.test.js
@@ -7852,6 +7852,15 @@ describe('Model', function() {
 
   });
 
+  it('Model.bulkWrite(...) does not hang with empty array and ordered: false (gh-13664)', async function() {
+    const userSchema = new Schema({ name: String });
+    const User = db.model('User', userSchema);
+
+    const err = await User.bulkWrite([], { ordered: false }).then(() => null, err => err);
+    assert.ok(err);
+    assert.equal(err.name, 'MongoInvalidArgumentError');
+  });
+
   it('allows calling `create()` after `bulkWrite()` (gh-9350)', async function() {
     const schema = Schema({ foo: Boolean });
     const Model = db.model('Test', schema);

From 6f5adfbbcf24a56e64aab1f266ace7efab80a66a Mon Sep 17 00:00:00 2001
From: Phillip Huang <phillip@vanta.com>
Date: Fri, 4 Aug 2023 15:59:32 -0700
Subject: [PATCH 2/2] lint

---
 lib/model.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/model.js b/lib/model.js
index b4f6596f676..f304618a7ef 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -3773,7 +3773,7 @@ Model.bulkWrite = function(ops, options, callback) {
     let validOps = [];
     let validationErrors = [];
     if (remaining === 0) {
-      completeUnorderedValidation.call(this)
+      completeUnorderedValidation.call(this);
     } else {
       for (let i = 0; i < validations.length; ++i) {
         validations[i]((err) => {