Override yii data-confirm dialog globally using npm sweet alert. ( after installing with composer require npm-asset/sweetalert2 ) -- (make sure you add the override.js file to your main AppAsset.php file)

kartik-override.js

/**
 * Override the default yii and kartik confirm dialogs. This function is
 * called by yii or kartik when a confirmation is requested.
 * This overides to use the sweetalert2 javascript library.
 * @param message the message to display
 * @param okCallback triggered when confirmation is true
 * @param cancelCallback callback triggered when cancelled
 * @var krajeeYiiConfirm  this variable overides the kartik dialog confirm, please ensure to use it as is.
 * 
 * 
 * 
 * 
 * make sure you add the override.js file to your main AppAsset.php file
 */

var krajeeYiiConfirm;
(function () {
    "use strict";
    krajeeYiiConfirm = function() {
        yii.confirm = function (message, okCallback, cancelCallback) {
            Swal.fire({
                icon: 'warning',
                html: message,
                showCancelButton: true,
                reverseButtons: true,
                showConfirmButton: true,
                confirmButtonColor: '#dc3545',
            }).then(function (selection) {
                if (selection.isConfirmed) {
                    !okCallback || okCallback();
                }else{
                    !cancelCallback || cancelCallback();
                }
            });
        };

    };
})();

yii-overide.js

/**
 * Override the default yii confirm dialog. This function is
 * called by yii when a confirmation is requested.
 * This overides to use the sweetalert2 javascript library.
 * @param message the message to display
 * @param okCallback triggered when confirmation is true
 * @param cancelCallback callback triggered when cancelled
 *
 *
 * make sure you add the override.js file to your main AppAsset.php file
 */

(function () {
    "use strict";
    yii.confirm = function (message, okCallback, cancelCallback) {
        Swal.fire({
            icon: 'warning',
            html: message,
            showCancelButton: true,
            reverseButtons: true,
            showConfirmButton: true,
            confirmButtonColor: '#dc3545',
        }).then(function (selection) {
            if (selection.isConfirmed) {
                !okCallback || okCallback();
            }else{
                !cancelCallback || cancelCallback();
            }
        });
    };
})();

Yii2SweetAlertAsset.php

<?php

namespace app\assets;

use yii\web\AssetBundle;

class SweetAlertAsset extends AssetBundle
{
    public $sourcePath = '@npm/sweetalert2/dist';

    public $js = [
        'sweetalert2.min.js',
    ];

    public $css = [
        'sweetalert2.min.css',
    ];

    public $depends = [
        'kartik\dialog\DialogYiiAsset',
    ];

}