How do I make a theme require Jquery (for anonymous users)? I'm creating a theme for D8 called 'herchel'.I'm trying to get this theme to require jquery on all pages (D8 doesn't load Jquery for anonymous users by default)

Looking through the what little documentation i can find on d.o in addition to the core themes, I created a file called herchel.libraries.yml

I've tried the following... all with no luck:

drupal.herchel:
version: VERSION
  dependencies:
    - core/jquery


-

drupal:
version: VERSION
  dependencies:
    - core/jquery


-

herchel:
version: VERSION
  dependencies:
    - core/jquery


Does anyone have any ideas on what I need to put in this?
I ran in to this upgrading one of my contrib themes to Drupal 8 as I wanted jquery.once for anonymous users. Here is what I did which works great:

In herchel.libraries.yml

herchel-corescripts:
  version: VERSION
  js:
    js/scripts.js: {}
  dependencies:
    - core/jquery
    - core/drupal.ajax
    - core/drupal
    - core/drupalSettings
    - core/jquery.once


Then in your theme's herchel.theme file.

function herchel_preprocess_page(&amp;$vars, $hook) {
  // Render the library as laid out in herchel.libraries.yml
  $libraries['#attached']['library'][] = 'herchel/herchel-corescripts';
  \Drupal::service('renderer')-&gt;renderRoot($libraries);
}


Pay mind to the indenting as well for the YML code. Though it's not really documented that well yet, you can have a look at this issue and its change log.   

Replace hook_library_info() by *.libraries.yml file

Note that you also see a theoretical theme's "scripts.js" file in the code above but you may not need it. In my theme, that's what uses jquery to call custom code.

This code is probably a good reference too for the YML bits. Note that in both cases version is at the same level as dependencies.

I also made a list of Drupal 8 issues I encountered and took part in with my D8 upgrade. 

Update:

I've fixed the code, we ran in to this issue: Replace #attached library array values with provider-namespaced strings

Note this: 

 $libraries['#attached']['library'][] = array('herchel', 'herchel-corescripts');


vs.this

$libraries['#attached']['library'][] = 'herchel/herchel-corescripts';


I tested and the errors went away. :)