service worker script registration doesn’t seem to work

On a fresh wp install, after installing the pwa plugin,
and in order to integrate my own code into the service worker –
i have added the following code into my plugin file:

// Add service worker script
function register_fc_service_worker_script( $scripts ) {
	$scripts->register(
		'fcsw', // Handle.
		array(
			'src'  => plugin_dir_url( __FILE__ ) . 'fcsw.js', // Source.
			'deps' => array( 'app-shell' ), // Dependency.
		)
	);
}
// Register for both the frontend and admin service worker.
add_action( 'wp_front_service_worker', 'register_fc_service_worker_script' );
add_action( 'wp_admin_service_worker', 'register_fc_service_worker_script' );

the script file consists of the following line:
console.log('hello from some context',this);

the result:
service worker is up and running, but no log on console.
in addition i was looking for my script code inside the sw code – it doesn’t exist.