Why aren't scripts written in the assets folder?

Question

Yii

created a widget in common/widget connected its asset in this way

public function init()
    {
        ModalAssets::register($this->getView());
    }

here is the asset itself

class ModalAssets extends AssetBundle
{
    public $publishOptions = [
        'forceCopy' => YII_DEBUG,
    ];
    //public $basePath = '@backend/widgets/companyModal';
    public $sourcePath = __DIR__ . '/assets';
    public $baseUrl = '@web';
    public $css = [];

    public $js = [
        '/js/modal.js'
    ];
    public $depends = [
        YiiAsset::class,
        BootstrapAsset::class,
    ];
}

but for some reason the script is not written in the assets folder and the browser shows the connection
Tell me why?

Answer 1

Good morning.
Try moving it ModalAssets::register($this->getView());to the method run();
In ModalAssets, in the init() method

public function init()
    {
        $this->sourcePath = __DIR__ . '/assets';
        parent::init();
    }

Widget structure.

assets /* js and css */
view /* view widget */
ModalWidget.php
ModalAssets.php

The first slash is redundant

public $js = [
   '/js/modal.js'
]