Register JS for block on frontend only

I’m using the following in PHP to register my custom block:

register_block_type( __DIR__, /* block.json */
  array(
    'render_callback' => 'render_my_block',
    'script' => 'my-custom-js',
  )
);

The block is registered but the my-custom-js JS file is loaded on the frontend and in the backend editor. How can I load it only on the frontend?

I tried 'view_script' => 'my-custom-js' and 'view-script' => 'my-custom-js' but it does not work.

I know that I can use is_admin() to check if it’s in the editor and not load a js file but I’m trying to see how it can be done with register_block_type().