<hr class="wp-block-separator color-cyberspace alignwide  alignwide">
<hr class="wp-block-separator{{#if color}} {{color}}{{/if}}{{#if modifier}} {{modifier}}{{/if}} {{#if class}} {{class}}{{/if}}">
{
  "color": "color-cyberspace",
  "modifier": "alignwide",
  "class": "alignwide"
}

Note!

Component is using block classes from wordpress instead of Atomic Design methodology