fix(timestamps): set timestamps on empty replaceOne()

Re: #9951
Re: #13170

lib/helpers/timestamps/setupTimestamps.js

@@ -7,6 +7,11 @@ const handleTimestampOption = require('../schema/handleTimestampOption');
 const setDocumentTimestamps = require('./setDocumentTimestamps');
 const symbols = require('../../schema/symbols');
 
+const replaceOps = new Set([
+  'replaceOne',
+  'findOneAndReplace'
+]);
+
 module.exports = function setupTimestamps(schema, timestamps) {
   const childHasTimestamp = schema.childSchemas.find(withTimestamp);
   function withTimestamp(s) {
@@ -90,7 +95,7 @@ module.exports = function setupTimestamps(schema, timestamps) {
       currentTime() :
       this.model.base.now();
     // Replacing with null update should still trigger timestamps
-    if (this.op === 'findOneAndReplace' && this.getUpdate() == null) {
+    if (replaceOps.has(this.op) && this.getUpdate() == null) {
       this.setUpdate({});
     }
     applyTimestampsToUpdate(now, createdAt, updatedAt, this.getUpdate(),

test/timestamps.test.js

@@ -548,6 +548,19 @@ describe('timestamps', function() {
       assert.ok(doc.createdAt.getTime() === doc.updatedAt.getTime());
     });
 
+    it('sets timestamps on replaceOne (gh-9951)', async function() {
+      await Cat.deleteMany({});
+      const { _id } = await Cat.create({ name: 'notexistname' });
+      await Cat.replaceOne({ name: 'notexistname' }, {});
+      const docs = await Cat.find({});
+      assert.equal(docs.length, 1);
+      const [doc] = docs;
+      assert.equal(doc._id.toHexString(), _id.toHexString());
+      assert.ok(doc.createdAt);
+      assert.ok(doc.updatedAt);
+      assert.ok(doc.createdAt.getTime() === doc.updatedAt.getTime());
+    });
+
     it('should change updatedAt when save', async function() {
       const doc = await Cat.findOne({ name: 'newcat' });
       const old = doc.updatedAt;