Assets Publishing In Module

I have a module that was written in Yii 1.x and am porting it to 2 (Bbii to be specific). I have this code in its Module class


	 * Register the CSS and JS files for the module


	public function registerAssets() {

		Yii::app()->clientScript->registerCssFile($this->getAssetsUrl() . '/css/' . $this->bbiiTheme . '/forum.css');


		Yii::app()->clientScript->registerScriptFile($this->getAssetsUrl() . '/js/bbii.js', CClientScript::POS_HEAD);


for which I wrote a bundle class and I registered it and published as shown below. Now in the same code (Bbii Yii 1.x code) I have:


	 * Retrieve url of image in the assets

	 * @param string filename of the image

	 * @return string source URL of image


	public function getRegisteredImage($filename) {

		return $this->getAssetsUrl() .'/images/'. $filename;


So I have re-written code as

public function registerAssets() 


    	$this->bundleInstance = \frontend\modules\bbii\BbiiAsset::register(\Yii::$app->view);




	public function getRegisteredImage($filename) {

    	return $this->bundleInstance->baseUrl .'/images/'. $filename;


But I get the frontend/web path from


instead of module path or at least assets path

I believe am doing something wrong here and would like to know what it is. So any help is appreciated!