[@types/mongoose] Add missing autoCreate?: boolean to ConnectionOptions type (#37853)

* Add autocreate to ConnectionOptions

https://mongoosejs.com/docs/guide.html#autoCreate was not included in types for Mongoose

* Update mongoose-tests.ts

* Update mongoose-tests.ts

* Update index.d.ts

types/mongoose/index.d.ts

@@ -28,6 +28,7 @@
 //                 Richard Davison <https://github.com/richarddd>
 //                 Brian Chen <https://github.com/ToucheSir>
 //                 Boris Figovsky <https://github.com/borfig>
+//                 Simon Driscoll <https://github.com/dinodeSimon>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -336,6 +337,11 @@ declare module "mongoose" {
     };
     autoIndex?: boolean;
 
+    /** Before Mongoose builds indexes, it calls Model.createCollection() 
+     * to create the underlying collection in MongoDB if autoCreate 
+     * is set to true.(default: false) */
+    autoCreate?: boolean;
+
     /** Specify a journal write concern (default: false). */
     journal?: boolean;
 

types/mongoose/mongoose-tests.ts

@@ -28,7 +28,8 @@ const connection2: Promise<mongoose.Mongoose> = mongoose.connect(connectUri, {
   useNewUrlParser: true,
   useFindAndModify: true,
   useCreateIndex: true,
-  autoIndex: true
+  autoIndex: true,
+  autoCreate: true,
 });
 const connection3 = mongoose.connect(connectUri, function (error) {
   error.stack;