types(models): make all properties to Model constructor optional

Fix #13897
Re: #11563

Author: vkarpov15

test/types/models.test.ts

@@ -751,3 +751,22 @@ function gh13957() {
   const repository = new RepositoryBase<ITest>(TestModel);
   expectType<Promise<ITest[]>>(repository.insertMany([{ name: 'test' }]));
 }
+
+function gh13897() {
+  interface IDocument {
+    name: string;
+    createdAt: Date;
+    updatedAt: Date;
+  }
+
+  const documentSchema = new Schema<IDocument>({
+    name: { type: String, required: true }
+  },
+  {
+    timestamps: true
+  });
+
+  const Document = model<IDocument>('Document', documentSchema);
+  const doc = new Document({ name: 'foo' });
+  expectType<Date>(doc.createdAt);
+}

types/models.d.ts

@@ -158,7 +158,7 @@ declare module 'mongoose' {
     AcceptsDiscriminator,
     IndexManager,
     SessionStarter {
-    new <DocType = TRawDocType>(doc?: DocType, fields?: any | null, options?: boolean | AnyObject): THydratedDocumentType;
+    new <DocType = Partial<TRawDocType>>(doc?: DocType, fields?: any | null, options?: boolean | AnyObject): THydratedDocumentType;
 
     aggregate<R = any>(pipeline?: PipelineStage[], options?: AggregateOptions): Aggregate<Array<R>>;
     aggregate<R = any>(pipeline: PipelineStage[]): Aggregate<Array<R>>;