fix(index.d.ts): work around #9969 for #9850

Author: vkarpov15

index.d.ts

@@ -99,7 +99,7 @@ declare module 'mongoose' {
    */
   export function isValidObjectId(v: any): boolean;
 
-  export function model<T extends Document, TQueryHelpers = {}>(name: string, schema?: Schema<any>, collection?: string, skipInit?: boolean): Model<T, TQueryHelpers>;
+  export function model<T extends Document>(name: string, schema?: Schema<any>, collection?: string, skipInit?: boolean): Model<T>;
   export function model<T extends Document, U extends Model<T, TQueryHelpers>, TQueryHelpers = {}>(
     name: string,
     schema?: Schema<T, U>,

test/typescript/queries.ts

@@ -17,7 +17,7 @@ interface ITest extends Document {
   tags?: string[];
 }
 
-const Test = model<ITest, QueryHelpers>('Test', schema);
+const Test = model<ITest, Model<ITest, QueryHelpers>>('Test', schema);
 
 Test.find().byName('test').orFail().exec().then(console.log);