yii2 registering JS files to a View

I have A.php view file in /views/A/ folder. And I have A.js js file in /views/A/ folder Please help me register js file in view file.

As I understand I must write $this->registerJsFile('path/to/file.js'); in view file.

but (Question A) I get method registerJsFile is not found in a class message from PHPStorm.

Also (Question B) what should I write in path considering both files are in the same folder /views/A/ ?