fix(NODE-6955): add missing wallTime property to applicable change stream documents

src/change_stream.ts

@@ -183,6 +183,14 @@ export interface ChangeStreamDocumentCommon {
    */
   clusterTime?: Timestamp;
 
+  /**
+   * The server date and time of the database operation.
+   * wallTime differs from clusterTime in that clusterTime is a timestamp taken from the oplog entry associated with the database operation event.
+   * The format is "YYYY-MM-DD HH:MM.SS.millis".
+   * @sinceServerVersion 6.0.0
+   */
+  wallTime?: Date;
+
   /**
    * The transaction number.
    * Only present if the operation is part of a multi-document transaction.

test/integration/change-streams/change_stream.test.ts

@@ -170,6 +170,26 @@ describe('Change Streams', function () {
     }
   });
 
+  it('contains a wallTime date property on the change', {
+    metadata: { requires: { topology: 'replicaset', mongodb: '>=6.0.0' } },
+    async test() {
+      const collection = db.collection('wallTimeTest');
+      const changeStream = collection.watch(pipeline);
+
+      const willBeChanges = on(changeStream, 'change');
+      await once(changeStream.cursor, 'init');
+
+      await collection.insertOne({ d: 4 });
+
+      const change = (await willBeChanges.next()).value[0];
+
+      await changeStream.close();
+
+      expect(change).to.have.property('wallTime');
+      expect(change.wallTime).to.be.instanceOf(Date);
+    }
+  });
+
   it('should create a ChangeStream on a collection and emit change events', {
     metadata: { requires: { topology: 'replicaset' } },
     async test() {

test/types/change_stream.test-d.ts

@@ -63,6 +63,7 @@ expectType<ResumeToken>(change._id);
 expectType<Timestamp | undefined>(change.clusterTime);
 expectType<number | undefined>(change.txnNumber); // Could be a Long if promoteLongs is off
 expectType<ServerSessionId | undefined>(change.lsid);
+expectType<Date | undefined>(change.wallTime);
 
 type CrudChangeDoc =
   | ChangeStreamInsertDocument<Schema> //  C