Termination

Termination is adding information to data fields that is used exclusively by admin interface. You can specify all kinds of properties, such as types, limitations, hide/show things, remove frames, size the input fields and much more

Generaly, to use any termination, you prepend dollar sign -‘$’ and add termination property after a underscore. So if you have field name, you can hide it from admin by $name_hidden: true.

Example

This

{
    background_image: 'https://cdn.meme.am/instances/500x/66927624.jpg'
}

Gives you this

But what is much cooler is saying the background_image field is an image. Like this:

{
    $background_image_type: 'image',
    background_image: 'https://cdn.meme.am/instances/500x/66927624.jpg'
}

Check out the available types to choose from at List of admin control types