<?php

namespace Yajra\Datatables\Contracts;

interface DataTableEngineContract
{
    /**
     * Get results
     *
     * @return mixed
     */
    public function results();

    /**
     * Count results
     *
     * @return integer
     */
    public function count();

    /**
     * Count total items.
     *
     * @return integer
     */
    public function totalCount();

    /**
     * Set auto filter off and run your own filter.
     * Overrides global search
     *
     * @param \Closure $callback
     * @return $this
     */
    public function filter(\Closure $callback);

    /**
     * Perform global search
     *
     * @return void
     */
    public function filtering();

    /**
     * Perform column search
     *
     * @return void
     */
    public function columnSearch();

    /**
     * Perform pagination
     *
     * @return void
     */
    public function paging();

    /**
     * Perform sorting of columns
     *
     * @return void
     */
    public function ordering();

    /**
     * Organizes works
     *
     * @param bool $mDataSupport
     * @return \Illuminate\Http\JsonResponse
     */
    public function make($mDataSupport = false);
}

<?php

namespace Yajra\Datatables\Contracts;

interface DataTableEngineContract
{
    /**
     * Get results
     *
     * @return mixed
     */
    public function results();

    /**
     * Count results
     *
     * @return integer
     */
    public function count();

    /**
     * Set auto filter off and run your own filter.
     * Overrides global search
     *
     * @param \Closure $callback
     * @return $this
     */
    public function filter(\Closure $callback);

    /**
     * Perform global search
     *
     * @return void
     */
    public function filtering();

    /**
     * Perform column search
     *
     * @return void
     */
    public function columnSearch();

    /**
     * Perform pagination
     *
     * @return void
     */
    public function paging();

    /**
     * Perform sorting of columns
     *
     * @return void
     */
    public function ordering();


    /**
     * Organizes works
     *
     * @param bool $mDataSupport
     * @return \Illuminate\Http\JsonResponse
     */
    public function make($mDataSupport = false);
}

--- 
+++ 
@@ -17,6 +17,13 @@
      * @return integer
      */
     public function count();
+
+    /**
+     * Count total items.
+     *
+     * @return integer
+     */
+    public function totalCount();
 
     /**
      * Set auto filter off and run your own filter.
@@ -55,7 +62,6 @@
      */
     public function ordering();
 
-
     /**
      * Organizes works
      *
Add totalCount on contact.
Remove excess new line.
