fix: wrong return type of onDuplicateUpdate

Author: felixmosh

__tests-tsd__/types.test-d.ts

@@ -13,7 +13,9 @@ const db = knex({});
       name: db.raw('Concat(name, "_test")'),
     });
 
-  const response = await db<{ id: number; name: string }>('table')
+  const [{ insertId }] = await db<{ id: number; name: string }>('table')
     .insert({ id: 1, name: 'bla' })
     .onDuplicateUpdate('name', 'id', { name: db.raw('Concat(name, "_test")') });
+
+  const testId = insertId === 1 ? 1 : 0;
 })();

types.d.ts

@@ -2,13 +2,13 @@ import { Knex } from 'knex';
 
 declare module 'knex' {
   namespace Knex {
-    interface QueryBuilder<TRecord extends {} = any, TResult = any> {
+    interface QueryBuilder<TRecord extends {} = any> {
       onDuplicateUpdate(
         ...columnNames: Array<
           | Knex.DbRecord<Knex.ResolveTableType<TRecord, 'insert'>>
           | keyof TRecord
         >
-      ): Knex.QueryBuilder<TRecord, TResult>;
+      ): Knex.QueryBuilder<TRecord, any>;
     }
   }
 }